Dataforth FAQ

The SCMD-MODC5 uses an internal solid-state switch.   

Real-time data from PWRM modules can be accessed via an Ethernet TCP/IP port using the HTTP API.  More specifically, any program or script that can issue and recive a response from a HTTP API GET request can communicate with PWRM modules.  LabVIEW provides a VI that can be used for this specific functionality:  https://www.ni.com/docs/en-US/bundle/labview/page/lvcomm/http_client_get.html. 

Dataforth does not currently have MAQ20 Toolbox for use with MATLAB, but communication between MATLAB and the MAQ20 is possible by way of one, or both of the following methods:

1.  MathWorks’ Industrial Communication Toolbox supports Modbus TCP/IP and serial RTU.  Use of this toolbox allows for easy communication with the MAQ20 by either ethernet or serial connection.
2. MATLAB supports calling Python libraries.  In combination with the free MAQ20 Python API, communication with the MAQ20 system can easily be accomplished by this method. MATLAB also offers a Python API which allows for MATLAB to be called as a computational engine from Python. 

No license is required to use a MAQ20 system as a stand-alone data logger. Logging to the internal Micro SD Card can be configured either in ReDAQ Shape or through direct Modbus writes to applicable register spaces of a MAQ20-COM module. If operating as a stand-alone data logger, the MAQ20 system should have no interactions with ReDAQ Shape. If ReDAQ Shape is not actively running or connected to the MAQ20 system, then no checks will be made in regards to licensing.

Burst scan mode is intended to be used for debugging and signal profiling purposes. It can not run continuously. Burst scan mode can capture samples to memory in magnitudes of microseconds, but it does not have the ability to read this data back from memory at this same rate.

To date there have been no occurrences of a MAQ20-COMx module being unable to be connected through an Ethernet connection as a result of an issue with the module's internal hardware/firmware. Connectivity issues can occur as a result of one, or a combination of the following factors: incorrect MAQ20-COMx settings, incorrect local network settings, incorrect host computer settings, network security settings, or IP address conflicts. When shipped from factory, MAQ20-COMx modules come with the following default connectivity settings pre-loaded in memory: IP Address: 192.168.128.100 Subnet Mask: 255.255.255.0 Gateway: 127.0.0.1 TCP Port: 502 Assuming the above-listed default settings are not changed, reserve a static IP address of 192.168.128.100 through your local network configuration. Assigning this IP address statically will ensure that no other devices on the network will be able to claim the IP address that is intended to be used by the MAQ20-COMx module. If not using the default IP address, the statically reserved IP address on the local network MUST start with 192.168.xxx.xxx and MUST match the non-default IP address that was saved to MAQ20-COMx module memory located at start address 50. If you need to check the IP address saved at this register address you can connect to the MAQ20-COMx through a USB connection and use ReDAQ Shape to read the register address' contents. This functionality in ReDAQ Shape can be found by clicking the "Read / Write Modbus Registers" sub-tab located after clicking the main "Analyze" tab. No license for ReDAQ Shape is required to use this functionality. Please refer to the note at the bottom of this FAQ for the host computer requirements that MUST be met to allow for connectivity. Alternatively, the MAQ20-COMx module can be set up for Ethernet connection using Dynamic Host Configuration Protocol (DHCP). To enable this functionality an IP address of 0.0.0.0 needs to be saved to the MAQ20-COMx's internal IP address register (Start address 50). You can write to this register through direct Modbus commands using the "Write Modbus Registers" feature located under the "Read / Write Modbus Registers" sub-tab in ReDAQ Shape. Changes to this address space will take effect upon power cycling the MAQ20 system. Once in DHCP mode, your local network will automatically assign an available IP address for the MAQ20-COMx module. You will need to access you local network configuration to determine what IP address was ultimately assigned to the MAQ20-COMx module. Once known, you can connect using the assigned IP address. NOTE: In all motioned configurations the host computer that will be used to connect to the MAQ20-COMx module through the Ethernet connection MUST have an IP address of the form 192.168.xxx.xx (I.e. any IP address starting with 192.168. that does not match the one saved at start address 50 of the MAQ20-COMx module). The host computer MUST also have a Subnet Mask of 255.255.255.0.

The upper copper terminal block of the DSCA37 and DSCA47 (pins 6, 7, & 8) are not removable. Those terminal block are directly soldered to the circuit board and contain cold junction compensation (CJC) circuitry. The bottom plastic terminal block (pins 1, 2, 3, & 4) are removable though.

The gARP checkbox controls whether Gratuitous ARP (Address Resolution Protocol) is implemented during a TCP sessions with the MAQ20. The term gratuitous in this case refers to the fact that such a request/response is not required according to ARP specification. An ARP packet broadcasted as part of an Gratuitous ARP scheme will contain the sender's IP and MAC address. Machines receiving the ARP packet will then update their ARP tables with the received packet's information. This feature is useful for preventing IP conflicts that can cause connectivity issues when communicating with a MAQ20 system over Ethernet.

Yes, this behavior is normal. SCM5B45s are characteristically more sensitive to long term drift compared to other SCM5B modules. If you notice characteristics that are not within the module's defined specifications, please contact customer support or submit an RMA at https://www.dataforth.com/rma.aspx for recalibration of the module.

The input to the MAQ20-JTC module is very sensitive. Movement of attached thermocouple wires can cause spikes in recorded data along with inherent noise present in different environments. Setting "Input Select" to the "Average" setting in ReDAQ Shape, or by direct Modbus commands can greatly reduce the variation in recorded channel data. Signal Averaging can be set on a per-channel basis by configuring the Average Weight parameter. Average Weight is calculated as 2^x where x = 0 to 15 and the default value is x =0 . The running Average is calculated as follows: Average = Average + ((Sampled Value - Average) / Average Weight)

The DSCP63 DC Voltage/Current converter is a match for this application. This module provides a single channel of voltage or current input which is converted to a voltage or current output. Input/output range, filter, fault indication, square root function and other functions may be configured by dip-switch. Disabling the filter on this module will reduce response time from <74ms to <35ms. Other modules that have configurable filters include the following: DSCP55, DSCP61, DSCP62, DSCP64, DSCP65, and DSCP81.

A completion resistor is not required for a DSCA38 strain gauge module in a half-bridge configuration. Half-bridge configuration using the DSCA38 requires two active strain gauges which are denoted as Rg in the block diagrams of the module's datasheet. A quarter-bridge arrangement uses only one active strain gauge and connects to the customer supplied resistor which is denoted as R3 in the quarter-bridge block diagram of the DSCA38's datasheet. This completion resistor is not provided since the resistance value needed will vary depending on the resistance of active strain gauge being used. When using the DSCA38 in a quarter-bridge arrangement, the resistance of R3 should match Rg. Further balancing of the bridge might be needed to offset any small differences between the resistance values of R3 and Rg.

The DSCA32-01 does not come with a dedicated loop power supply that could be used to power a sensor. The DSCA42-01, a 2-wire transmitter interface module could be used instead, since it provides the same input/output range as the DSCA32-01, with the addition of an isolated 24V power supply for powering the 2-wire transmitter/sensor.

Dataforth does not currently offer an equivalent True RMS module for DC coupled inputs, but a two module solution could be implemented depending on the parameters of the DC offset and the AC waveform. Such an implementation was tested with an SCM5B33-03D True RMS Input Module (0-10Vrms input and 0-10VDC output) and an SCM5B31-02 Narrow Bandwidth Voltage Input Module (+/-5V input and +/-5V output). The inputs to these modules were tied in parallel and connected to a waveform generator with a specified VDC offset and VAC waveform within the input limits of the two modules. The outputs of the modules were then connected in series to get a combined output equal to the sum of their individual output voltages. Both modules were mounted on their own SCMPB03 single channel backplanes in order to maintain separate I/O COM lines for the required series connections to be made on the outputs. Alternatively a single SCMPB07 8-channel backplane could have been used since it allows for isolation of each channel's I/O COM line via a provided jumper. Please note that this combined module configuration will result in a small increase in total error since each module's parameters for accuracy are added up. If a two module configuration is not possible for a specific application, a custom version of the SCM5B33 with revised coupling circuitry might be possible depending on the required specifications. Be aware that custom module designs are subject to NRE charges and require a 10pc minimum quantity order.

There are two different versions of ReDAQ Shape software, Developer and User. The Developer version is fully functional with the capability of creating a project, configuring the tools, and setting up the parameters of MAQ20-COM and I/O modules. The User version can only run finished projects created using the Developer version and is for use in applications where a user does not have or should not have the ability to modify a project.

It's not possible to use a single license for multiple MAQ20-COM modules. Software licenses for the Developer and User versions of ReDAQ Shape are uniquely assigned based on the serial number of a purchased MAQ20-COM module. A single MAQ20-COM module can have at most two licenses associated with its serial number; one for Developer and one for User. The User license can only be used with the User Version of ReDAQ Shape and the Developer license can only be used with the Developer version of ReDAQ Shape.

DC channel to channel isolation for all SCMPB backpanels is 2121 VDC.

SCM5B, SCM7B, 8B SensorLex, and DSCA modules are well suited for use in high vibration environments. These modules and their associated accessories have undergone testing for random vibration, shock, and swept sine wave vibration. Details of each of these testing methods are provided below: Random Vibration (Operating): ○ MIL-STD 202G, Method 214A, Condition 1 - Frequency Range: 50-2000Hz, flat spectrum - Vibration Intensity: 7.56 Grms - Duration: 10min/axis (X, Y, Z) Shock (Operating): ○ MIL-STD-810F, Method 516.5 - Pulse Shape: Sawtooth - Test Level: 30G - Duration 11ms - Orientation: +/-X, +/-Y, +/-Z Swept Sine Vibration (Operating) ○ MIL-STD-810G, Method 514.6, modified - Frequency Range: 10-2000Hz - Vibration Intensity: 5Gp-p - Sweep Rate: 1 octave/min - Orientation: X, Y, Z Declaration of conformity for the above-listed tests can be provided upon customer request. Please contact customer service if a copy of the declaration is needed.

Yes, the SCM5B33 True RMS input module can be used with a PWM input signal. The module can be used with both sinusoid and non-sinusoid inputs. Module accuracy varies slightly based on the crest factor of the input waveform. Please refer to the "Specifications" section of the SCM5B33 datasheet for additional information on how crest factor affects module accuracy.

While the MAQ20 was not designed with portability in mind, its compact size and modular design allows for easy transportation and portable usage. Many customers who use the MAQ20 in portable applications prefer to use a dedicated laptop to run ReDAQ Shape through a USB connection. This method of connection eliminates the hassle of setting up a dedicated network connection at each site. Alternatively, other users have taken advantage of the MAQ20's ability to log data directly to an internal Micro SD card without the need for a connected computer.

Two dimensional CAD models can be generated upon customer request. Please contact Customer Service for assistance.

The SCM5B47T-07 and SCM5B47T-07D differ in their output voltage ranges. The D suffix in SCM5B47T-07D signifies an output range of 0 to +10V. If no D suffix is present, as is the case for the SCM5B47T-07, then the output range is 0 to +5V. Aside from their output ranges, the modules are identical.

Yes, as long as the peak voltage of this signal does not exceed 1V in the positive range or -1V in the negative range. Since the SCM5B series has a 1500Vrms CMR rating, this signal could also be measured on top of a much larger signal up to 1500Vrms, as long as the differential signal going into the input of the module is no higher than 1V or no lower than -1V.

This usually has to do with the display language of the host PC being set to a language other than US English. If you are experiencing this error, please try setting the display language of your PC to "English (United States)" and then see if you are still experiencing issues. If this does not fix the problem, please contact Dataforth technical support.

A 3kHz bandwidth on an input module means it can accept voltages from DC to 3000Hz. Any frequency higher than that and the signal will start to be attenuated by the filter at the input.

When the SCM5B34 receives a temperature input signal below negative full scale, the module’s output will drop slightly below 0V non-linearly, no lower than -0.7 to -1V.

ALL MAQ20 systems connected to ReDAQ Shape need a valid unlock code, or else the software will stop running after 30 minutes.

The MTBF for DSCT32 is 624,000 hours.

The 8B backpanels identify the module slots and their associated terminal block with silkscreen text (this includes the +/- inputs). The text is descriptive and matches up with the diagrams in our datasheets.

For the DSCA38-02, the +/-30mV range maps to the +/-10V output; -30mV input = -10V output and +30mV input = +10V output. The sensitivity is a specification that refers to the sensitivity of the strain gauges that are fully compatible with the module. If a DSCA38-02 is used with a load cell that has 2mV/V sensitivity, then the module's output is limited to two thirds of the full range (i.e. +/-20mV). This assumes the load cell has a rated excitation voltage of 10V. This reduced output range might be okay depending on the specific use case.

Not just SCM5B modules, but any signal conditioning module series and MAQ20 I/O modules can be hot swapped. A minimal amount of signal settling time may result, but there will be no damage to the device.

If you are interfacing with a half bridge strain gage, the MAQ20-BRDG1 module contains two internal resistors, each 4.9kohms, that can complete a half bridge, so no external resistors are required. If you are interfacing with a quarter bridge strain gage, you must supply an external resistor that is equal in resistance to the resistance of your strain element, and use the "Half Bridge" completion setting in the module.

Normally, a response time figure refers to how quickly a module's output can "respond" to a change in the input signal. "Response time, 90% span" refers to how fast a module can adjust its output when a step signal is applied at the input, where the magnitude of this step input is 90% of the input span of the module.

Yes, DSCA modules do come with the screw terminal blocks installed. The screw terminal accessories listed in our catalog are intended as replacements in case a terminal block is damaged or lost.

The 8B47 is input protected up to 240VAC and can withstand common mode voltages up to 1500Vrms max. A 32kV signal would damage the module.

Applying custom channel names in ReDAQ Shape is for display purposes on the Acquire panel only, it does not change any information within the module. Because the SD card log takes place within the MAQ20-COMx module, separate from the Acquire panel, it is not possible to have your custom channel names from the Acquire panel in your SD card log.

None of the standard DSCA38 products have a 10Hz bandwidth. However, we do offer some custom products that have 10Hz bandwidth, such as the DSCA38-1348 or the DSCA-1455. Dataforth can also design a custom product with 10Hz bandwidth, as long as the required specifications are reviewed and approved by our Engineering department. Please contact our support team if you are interested in a custom product or have any questions.

The 8B47 has an upscale open input response. Standard product 5V output modules will go to 8V for upscale. Standard product 10V output modules will go to 13V for upscale.

There is not a MAQ20 module dedicated to accelerometer input. However, it’s possible to frontend a MAQ20 voltage input module with an SCM5B48 Accelerometer Input Module using the Dataforth MAQ20-5B25 interface cable. You’ll have to purchase the cable, the module(s) and the appropriate size SCM5B backplane to make it work, but it is possible. Essentially, you have the SCM5B48 process the accelerometer input, and then the voltage output of that module is connected to a voltage input module in your MAQ20 system.

The CJC jumper is actually not required for the 8B36. In this case it is a “don’t care.” Some modules require it to be removed, but for the ones that don’t it is easier to just have it remain installed.

The DSCA33 is AC coupled, so it will reject the DC portion of the signal and only measure the AC portion. As long as the signal is within the protection specifications of the module (these can vary depending on the specific model of DSCA33) there will be no issue measuring VAC on top of VDC.

CJC is mandatory when using thermocouple input modules, or else you will not get an accurate measurement. Make sure to always purchase a backplane with CJC installed if you are using a thermocouple input module.

No, the CJC will work for all thermocouple modules that can be mounted to that backplane.

Yes, the DIN rail mounting hardware for the SCMPB04 can be easily detached and reattached from the board.

The SCMVAS-PB8 is the smallest available backplane for the SCMVAS module series. If you are looking for a small channel count, you may be able to find a suitable custom module in another product line with smaller backplanes that can handle high voltages in our Custom Product List.

Because the high/low thresholds for 5VTTL and LVTTL are the same, the LDM85 will work with this standard.

The MAQ20-BRDG1 has two methods to compensate for leadwire resistance: remote sense measurement and V/V ratiometric signal representation. Remote sense measurement allows for a six wire connection to the sensor to compensate for errors introduced by leadwire resistance. For V/V ratiometric signal representation, because a Wheatstone bridge output is directly related to the bridge excitation voltage, by using a ratiometric measurement, variations in bridge output due to excitation changes over time, temperature, load, or leadwire resistance cancel out. More details about these are listed in the MAQ20-BRDG1 Hardware User Manual (MA1046).

Yes, the SCM5B4 can accept both grounded and ungrounded thermocouples due to the input to output isolation of the modules

Please see the SCM5B Module Dimensions and Pinouts link from the SCM5B section of our website: https://www.dataforth.com/catalog/pdf/scm5bdim.pdf You can also find the module dimensions and pinouts in our product catalog.

DSCA module screw terminals are rated to wire gage AWG: 28 – 12.

Yes, any MAQ20 I/O module should automatically register in the system once plugged in. If you are finding that the module is plugged in and not registered, check the diagnostic LEDs on the module to verify that it is receiving proper power. These diagnostic LEDs can also be used to further diagnose any connection issues if the modules are still not registering. For more information, see the hardware manual of the corresponding module, which can be found in the MAQ20 section of our website.

SCM5B392-xxyy are a two module pair. The intent is to have a voltage signal that can be transmitted across a long distance. When used together, an input voltage is converted to a process current, transmitted a long distance, then converted back to a process voltage. SCM5B392-1x modules can be used in place of an SCM5B32-xx if the I/O ranges are equivalent. However, the SCM5B392-1x modules have a 1kHz bandwidth while the SCM5B32 modules have a 4Hz bandwidth.

The data conversion resolution in the MAQ20-ISOxx modules is 16 bits.

It is possible to use the SCM5B33 with SCMVAS. However, the output impedance of the SCMVAS-MXXX module at around 14.8k will be loaded by the input 1Mohm input impedance of the SCM5B33-02. This results in an approximate -1.5% positive full scale error.

SD card logger functionality has not been implemented in IPEmotion yet. Please contact Dataforth for more information.

The DSCA30/31 has an input to output isolation of 1500Vrms, meaning that it is possible to measure small potentials on top of a 1500V common mode voltage. This will not damage the module.

The MAQ20-DORLY can switch AC loads that comply with the ratings. The peak value of the AC signal would be used to determine if the AC signal complies with the module's ratings. This rating decreases with an increase in module temperature. The MAQ20-DIOH is specifically designed to switch AC loads.

Yes, this can achieved by connecting the positive output of the two modules together, and connecting this to one end of a load resistor. Then, connect the negative output of the two modules together, and connect this to the other end of the load resistor.

The 8BP04 has both a DB25 connector and output screw terminals to access the output signal from the modules mounted on the 8BP04. If you decide to use the DB25 connector we also offer the SCMXCA006-01, -02, -07 which are 1m, 2m, and 7m, varieties of a DB25 Male/Female cable assembly.

All DSCA40 and DSCA30 modules are input protected up to a continuous 240Vrms signal. 12V is well below that rating and will not damage the module.

The overrange capability is approximately 10% of the input range unless otherwise specified in the datasheet. Beyond that level the output will become nonlinear and will clamp either at a reference or power supply rail. Accuracy and linearity are not guaranteed over the minimum and maximum output. The module will not be damaged in any way unless the input exceeds the input protection specification, which is 240Vrms continuous.

The DIN rail mounting of the SCMPB04 can mount to DIN rail types EN 50022-35x7.5, EN 50022-35x15, EN 50035-G32. These can be purchased as part numbers SCMXRAIL1-XX, SCMXRAIL2-XX, pr SCMXRAIL3-XX where XX is specified as the length of the rail in meters.

The SD Card Logger in the MAQ20 can function as a standalone data logger once configured. After initiating the log, the system can continue to log data for the rest of the configured data collection period even if it is disconnected from the host PC entirely. However, if you wish to configure another log, you must reconnect the system to the host PC. Any other logging processes with the MAQ20 require connection to the host PC for the entire logging period.

The thermocouples must be isolated so current does not come from the circuit under test and run through them. SCM5B, SCM7B, 8B, DSCA, DSCT, MAQ20 all offer the required isolation.

Yes, every function of the MAQ20 can be used as long as you have some way to communicate with the system via Modbus. ReDAQ Shape simply offers a more intuitive and user friendly approach to MAQ20.

Yes, custom non-linear output curves can be configured from a linear input with the DSCP81 using the DSCX-557 software. The DSCX-787 and DSCX-587 cables are required to connect to the PC to configure the module.

Each type of unlock code is only compatible with its respective software version and associated MAQ20-COM module HW. Developer unlock codes will only work with Developer version of ReDAQ Shape and User unlock codes will only work with User versions of ReDAQ Shape.

SCM5B47 module output is linearized with respect to the input temperature. SCM5B37 modules require a special calculation to determine the input temperature from a given output voltage. Please see our application note for more information on this: https://www.dataforth.com/thermocouple-voltage-to-temperature-conversion-method.aspx

Information on MTBF for SCM5B, SCM7B, 8B and DSCA is available on our website. Please see application note AN802 for more details. Application notes can be found under the "Literature" tab on the top navigation bar.

All power supplies are sold separately from the LDM85. The PT3 and PT3E are compatible power supplies with the LDM85.

Both the TTL and Zero Crossing inputs are single-ended. Both inputs have a 100kOhm input impedance in the power off condition. The TTL input has an input attenuator, so input resistance is approx. 100kOhm. For Zero Crossing input, signals under +/-0.4V don’t clamp the diode so the 100kOhm is in series with the amplifier input which provides high impedance.

With the SCM5B47x-xx connected to a proper backplane with CJC, with power being supplied, you can short the input terminals of the device to force a room temperature reading. Then you can check the output of the module and see if the output is what you're expecting. To determine what the proper output of a module is at room temperature, you'll need to look at the specific input and output range of the module you are using.

The largest backpanel for the SCMVAS modules is the SCMVAS-PB16 which has 16 channels. Multiple backpanels can be purchased if more channels are needed.

Yes, the quarter and half bridge SCM5B38 modules have the bridge completion resistors across terminals +EXC and -IN and -EXC and -IN internal to the module. Applying fixed resistors across the same terminals will have the same effect on a full bridge SCM5B38.

Yes, signal frequencies lower than the bandwidth of the input module (10kHz for standard products) will pass through to the output. The amplitude of the voltage signal will gained/attenuated based on the I/O specifications of the module.

8GB is now the max size for the SD card. Recent shipments of COM modules include 8GB SD cards.

The MAQ20-COMx modules accept microSD cards of up to 8GB size.

We do not recommend soldering the SCM5B pins to a board as it could potentially damage the module. Soldering the pins would also void the warranty. Many sockets are available which accept the mounting pins. TE Connectivity / AMP part number 50865-5 is an example of these sockets and any equivalent part will work as well.

Vout is used with input modules, which are all the SCM5B models except for the SCM5B39 and SCM5B49. Vin is used for output modules, SCM5B39 and SCM5B49. The reason for doing this is because input modules acquire a signal from the field side, and then output a corresponding signal to the system side. On the contrary, output modules acquire a signal from the system side, and then output a corresponding signal to the field side. Since SCM5B backplanes are designed for all channels to accommodate either an input or an output module, the terminal/pin that you would normally get your output signal from if you were using an input module is the same terminal/pin that you would be feeding your input signal to if you were using an output module.

Yes, calibration of Dataforth modules is traceable to NIST standards.

The input impedance of the MAQ20-VDN is 554kOhms.

The input impedance of the MAQ20-MVDN is 50 Mohms.

Please see application note AN501 for details: https://www.dataforth.com/thermocouple-voltage-to-temperature-conversion-method.aspx

The product datasheet lists the typical specs of +/-0.03% for the entire SCM5B41 family (at Ta = 25C and +5VDC power). The +/-0.08% is the maximum limit set during the production test.

No, converting any of the 16 channel SCM5B backplanes to something DIN rail mountable is a much more involved process than the SCMPB03/04. If you would like a 16 channel SCM5B backplane that can mount on a DIN rail you must purchase an SCMPB01-2, SCMPB01-3, SCMPB02-2 or SCMPB02-3.

The DSCA30/31-xx series cannot be modified to have a faster response time. However, the DSCA40/41-xx series is the direct equivalent of the DSCA30/31-xx series, but with a wider bandwidth and faster response time.

An in-line filter for a millivolt level signal is difficult. Wiring technique and shield grounding is generally the most effective way to reduce noise.

No, all SCM5B modules have the same power requirements (5VDC) regardless of their I/O specifications. The power supply current draw of different products in the SCM5B line may vary.

No, the microcontroller used for analog I/O on the SLX300 can only support 4 channels of analog output.

Some 8B modules (such as 8B34 and 8B47) cannot have bipolar output due to limitations in the internal linearization circuitry.

Thermistor interface has never been designed for SCM7B, 8B, DSCT, or MAQ20 product lines. However, we do have some custom products in the SCM5B line that can accept thermistor interface. Any SCM5B36, SCM7B36, 8B36, DSCA36, DSCT36 module with potentiometer input 0-10kohm may also be suitable for some sensors.

Currently, ports are not selectable in the MAQ20-COMx modules and they only work with port 502. This may change in a future firmware update.

Yes. Backplanes with no CJC will still come with the CJC enable installed on the backplane.

The control current required for the relays is 2.2mA. You can find this information in the datasheet for the SCMD modules on our website: https://www.dataforth.com/catalog/pdf/SCMD-MXXX-specsheets.pdf

The current required to switch the output for the SCMD-MODC is 27mA. You can find this information in the datasheet on our website: https://www.dataforth.com/catalog/pdf/SCMD-MXXX-specsheets.pdf

Yes, the SCMD-MODC modules can be used to directly drive loads such as solenoids. The maximum on state current for some SCMD-MODC models can be up to 5A.

J1-J4 on the SCM5B backpanels are jumper cables, so they should have 0 ohm resistance.

The MAQ20-COM2 / -COM4 does not buffer data for transmission, it is only a pass through for communications. The 6ms command/response cycle of acquiring data from the I/O modules in the system also includes the time it takes to transfer data to the host PC.

A current of 100mA applied to the input of the DSCA32 would be safe. This signal would cause the output to go upscale, but it would not damage the device.

The DSCA33 would still output the RMS of the waveform. However, the DSCA33 may be less accurate due to the crest factor of such a signal.

ReDAQ Shape licenses are tied to the COM module of the system, so no, they cannot be transferred. However, projects created with a Developer license can be ran on other systems with a User license.

The sensitivity is listed on the datasheet to help determine what strain gages/load cells will be compatible with that module. Strain gages do not have a specific voltage output range (i.e. -30mV to 30mV) but rather a voltage output range that varies depending on the excitation voltage applied to the strain gage (its "sensitivity"). Since our strain gage modules have a fixed voltage input range and a fixed excitation voltage, the sensitivity is the most reliable way to determine if a strain gage is compatible with our module. For example, a load cell with a 3mV/V sensitivity will output 30mV at full scale with a 10V excitation voltage, because 3mV/V * 10 V = 30mV. A signal conditioner with a 10V excitation and a -30mV to 30mV input range will be compatible with a load cell of 3mV/V sensitivity.

If you start a standard logging process (i.e. clicking "run" in ReDAQ Shape or "store" in IPEmotion), disconnecting your MAQ20 system from the PC will terminate the log. However, if you use the MAQ20s SD Card Logger, you can start a data log and disconnect the MAQ20 and it will continue to log data until it reaches the end of the log based on the parameters you have specified (number of samples, time interval, etc.)

Yes, it is possible to send a remote setpoint via Modbus/TCP to PID loop running in ReDAQ Shape by writing to the Modbus registers of the MAQ20 hardware. Please see the address map at the end of the MAQ20 PID Controller User Manual

Navigate to the "Plots, Xaxis, Yaxis" section in the bottom left corner. Click either the second or third down "..." icon. This will open either the X or Y axis editor respectively. Under "Appearance" there should be a parameter "Caption". You can type a new title for the axis in the column next to the word "caption".

MAQ20 test data sheets are not available on our website. However, test data sheets for purchased MAQ20 modules are available upon request. Please contact our Customer Service Team at sales@dataforth.com

It is not recommended to ground the sensor wire shield to the 10-32 ground post on the SCMPB01 because that is the system side ground, while the sensor wire is on the field side. The sensor wire shield should be grounded to the field side ground, which varies based on the signal conditioner you are using. Please see the "Shield Grounding" application note for more information.

Technically, yes you could use an SCM5B41-07 in your SCMVAS system. However, it is not recommended since the output of all SCMVAS modules are -1 V to 1 V. Since the SCM5B41-07 has a -20 V to 20 V input range, most of that range will go unused while your accuracy suffers as a result since the SCM5B line has +/-0.03% span accuracy.

The factory configuration for jumpers J1 through J4 is the optimal configuration for most applications. If for some reason this jumper configuration will not work/is not working in your application, see our application note AN502 "Ground Connections and Host System Interfaces" for other valid jumper configurations and what situations you would use them.

ReDAQ Shape is ran externally from the MAQ20 system on a host PC running Windows OS, not on the MAQ20-COMx module.

Yes, the version available for download from our website can serve as a demo if you do not have an unlock code. The unlicensed software will run for 30 minutes with full functionality with no license. Once the 30 minutes is up, you can restart the program to reset the 30 minute time for as many times as you would like.

Data logged in the Analyze panel in ReDAQ Shape can be exported to a .txt file or Excel file. The SD Card Logger can generate .csv files as well.

No, the SCMPB03 comes with the CJC built into the backpanel.

No, we have many customers that use our MAQ20 system 24/7, 365 days a year. We also have a weather station onsite that uses a MAQ20 system continuously running 365 days of the year. Please visit https://www.dataforth.com/maq20-remote-access-viewer.aspx to access the weather station demo.

Yes, refer to the address map of the module you are using which can be found at the end of that module's hardware user manual. There will be a register "Save to EEPROM." Writing the appropriate value as described in the address map to this register will save your module's current settings to EEPROM.

Yes, you can. The 8BPWR-2 is not required to power the 8B backplanes, it is used in situations where you don't have a +5VDC power supply and need to regulate the voltage of whatever current power supply you are using down to +5VDC so that it can be used for the 8B backplane. Please make sure when choosing your +5VDC power supply that the current rating of the supply is acceptable for the total current draw of your system.

You can use a single 5V power supply to power multiple backplanes, but you need to be aware of the current rating of your power supply and the current draw of your 8B modules. The current rating of your power supply needs to be greater than the total current draw of all the modules in your system (ideally 1.5x the total current draw). You can check the current draw of various 8B modules by checking their datasheets.

The failure rate calculations for our SCM5B modules can be found in our application note AN503: https://www.dataforth.com/catalog/pdf/an503.pdf There are no dominant failure modes.

No, the MAQ20 cannot save or export data directly to a SQL database. ReDAQ Shape can export data directly to a .txt, .csv or Excel file, and then the data could be extracted from those files to be uploaded to a SQL database.

The MAQ20-xTC input modules accept stranded wire from AWG 24 to AWG 20 and solid wire from AWG 26 to AWG 20.

Yes, any of our SCM5B modules are able to be mounted and operated on Omega's OM5-BP-SKT-C board.

For models DSCA33-01 through DSCA33-05, the input impedance is 499kOhm with a <100pF capacitor in parallel with the resistor. For the DSCA33-06 and DSCA33-07, the input impedance is 100 milliohms and 25 milliohms respectively.

None of our standard SCM5B modules have a 50kHz bandwidth. However, it is possible to order a custom SCM5B module with 50kHz bandwidth. Keep in mind that new customs require a 10 pc minimum order and are subject to extra design fees.

If you were to put a 120ohm bridge into an 8B38-02 the excitation voltage won’t regulate, and it won’t provide the proper amount of excitation. The load range must be in the specified range.

The 8B38 has an input protection of 240VAC continuous, so a 0-5V input will not damage the device. You can apply a continuous signal of up to 240VAC before the input will start to get damaged.

The Configuration Software Tool for MAQ20 does not have project files that can be saved. Any adjustments you make to the configuration of your modules through the Configuration Software Tool will be saved to the modules themselves, and not to a file on your PC. It is only a tool to change the settings in the modules themselves.

PCOM is connected to I/O COM on the SCMPB04 through the use of a factory installed 0 ohm resistor. This resistor can be removed, but would need to be soldered back on if you needed to reattach it.

Any of the backpanels in the 8B series will work for the 8B38 module. In fact, any of the 8B modules can be mounted to any of the 8B backpanels.

SCM7B47 modules are designed to interface the 100k NTC thermistors which are installed on the SCM7B backpanels. Therefore, remote CJC is only possible if the 100k thermistor is replaced with a fixed resistor which requires a custom backpanel.

If you were to use a copper 10 ohm at 25 degrees Celsius RTD with the SCM5B34C-03 then your output would be offset by roughly 25 degrees Celsius resulting in incorrect readings. However, if you need an RTD input module with the same input/output specs as the SCM5B34C-03 that works with your RTD, we do offer the custom module SCM5B34C-1526.

The DSCA series is completely analog, so the output resolution cannot be expressed in terms of bits as it is not a digital signal. The only thing that would cause any uncertainty/lack of clarity in your output signal would be the output ripple and noise, which is rated at a typical value of 0.025% span RMS as listed in the datasheet.

Currently, the MAQ20 Python API only supports Ethernet connection.

Please observe the block diagram in the datasheets of the LDM35 and LDM30 modules. In the block diagram, you can see the direction of space current and mark current through terminals 3 and 4 (TD+ and TD-). Since these currents flow in the opposite direction between the LDM30 and LDM35, the LDM35 cannot be used to replace the LDM30. We recommend replacing the LDM30 with another LDM30, or you can use the LDM70 as a suitable replacement as well.

The MAQ20 ideally has equally fast response times regardless of whether you use USB or Ethernet connection. Other variables outside of the MAQ20 can influence this response time however, such as if you are using a USB to Ethernet adapter or if the MAQ20 is part of a larger company network.

Although we do not carry signal conditioners that can interface with AC LVDTs, we do have the SCM5B43, 8B43 and DSCA43 which can interface with DC LVDTs.

Our linearized thermocouple modules have a bandwidth of 3-4 Hz in order to reject any induced noise along the sensor line. If a wider bandwidth is needed, a custom module could be designed and manufactured to meet the required specifications. Contact Dataforth at support@dataforth.com to discuss your specific needs.

Yes, the MAQ20-FREQ module can support tachometer input. Please reference the user manual for the MAQ20-FREQ module for more information on how to process RPMs.

Yes, the SCM5B modules are isolated up to 1500 Vrms, which means that if the common mode voltage between the field side and system side is limited to 1500Vrms, the device will be protected. However, the input protection for SCM5B modules (i.e., the voltage across the +IN and -IN input terminals) is 240Vrms max.

Yes, the SCM7B32-01 is a direct replacement for the 7B32-01-1. Any application that uses a 7B32-01-1 will support an SCM7B32-01, and vice versa.

The DSCA45 accepts TTL signal input across input terminals 6 and 7 (+IN and -IN). A pulse train should be wired across terminals 6 and 7 for proper operation.

There are two places that you can download the USB drivers for MAQ20. If you haven't already downloaded ReDAQ Shape, you will be given the option to download the required USB drivers during the installation process. If you already have ReDAQ Shape downloaded and you somehow lost the USB drivers, you can download them from our website. The USB drivers for the 8B isoLynx SLX300 system are identical with the USB drivers for the MAQ20. Visit this link, scroll down to the "Drivers" section on the page and download "USB (Virtual Comm Port Driver)": https://www.dataforth.com/8Bisolynx_download.aspx

The SCMD-MORO5 and the SCMD-MORO24 are functionally equivalent modules, however they have different input voltage and current specifications. Refer to the "SCMD Specifications" pdf on the "SCMD Series" page on our website to view the exact specifications of the modules.

Which terminal block you connect to on an SCMD backpanel will vary based on the model number of the board or what channel you are using. As a general rule for an SCMD-MORO module, the power supply is wired over pins 3 (+V) and 5 (Gnd). The input signal is wired over pins 4 (Sgnl) and 5 (Gnd). The output signal is over pins 1 and 2. Consult the schematic of your SCMD backpanel to determine which terminal blocks correspond to each pin.

Dataforth does not have any custom modules that run on 12VDC power. Most DSCA modules require a minimum power supply voltage of 15VDC while some require a minimum of 19VDC. Both are suitable for use with nominal 24VDC power supplies over the full operating temperature range of -40C to +85C. Dataforth offers a line of accessory power supplies, PWR-PS5RxW, which have been qualified for use with the DSCA product line. https://www.dataforth.com/catalog/pdf/PWR-PS5RxW.pdf

The SCM9B-1000 and the SCM9B-2000 have the same physical dimensions. The SCM9B-1000 hardware is similar to the SCM9B-2000 series in every respect except that the SCM9B-2000 contains built-in commands to create custom input-to-output transfer functions.

Noise at the output of a module is independent of load resistance.

Unlock keys are generated from the serial number of the COM module of the system that you purchased. These unlock codes are also generated based on how many I/O modules are in the MAQ20 system. You won't be able to run the data acquisition process in IPEmotion unless you have entered the correct unlock code for your system and the I/O module count of your system is equal to or below the allotted I/O module count determined when the unlock code was generated. For example, if you purchased an unlock key for a MAQ20-COM2 with 1 MAQ20-VO, 1 MAQ20-VDN, and 2 MAQ20-BRDG modules, this would correspond to an I/O module count of 4. If you attempted to run the acquisition process with this configuration, it would work perfectly. If you decided to remove the two MAQ20-BRDG modules, you would still be able to run the acquisition process. However, if you were to add a MAQ20-FREQ module to your system, bringing your total I/O module count to 5, IPEmotion will not let you start the data acquisition process until the I/O module count is back to 4 or lower. If you have more than one MAQ20-COM module in your system, it is not necessary to enter additional unlock codes for the extra COM modules.

Unlock codes are generated based on the serial number of the COM module of the system you purchased. If you are running an unlicensed version of ReDAQ Shape you sill have access to all the features of the software, but are limited to 1 hour of usage until the software stops. Entering the unlock code associated with your MAQ20 system will remove the time limit and allow unlimited usage of ReDAQ Shape. You must purchase an unlock code for every COM module you are using in order to have unlimited usage of ReDAQ Shape. Note: Licenses purchased for the Developer version of ReDAQ Shape are not compatible with the User version, and vice versa.

To convert an RMS voltage to its corresponding peak voltage, you simply take the RMS voltage value and multiply it by the square root of 2, or roughly 1.414. For example, 1500Vrms corresponds to a peak voltage of 1500 * 1.414 = 2121 Vp

A signal conditioner with these I/O ranges does not mean that the module ignores the polarity of your voltage input. The output of voltage input modules are scaled linearly, meaning an input of -1V would correspond to an output of 0V, an input of 0V would correspond to an output of 5V, an input of +1V would correspond to an output of 10V, and so on.

The recommended power supply for the Dataforth SCM5B and 8B modules are the linear power supplies in our SCMXPRT/SCMXPRE series. The SCMXPRT/SCMXPRE power supplies output 5V and have options for 1A output current (SCMXPRT-001) or 3A output current (SCMXPRT-003). The SCMXPRE series is identical to its SCMXPRT counterpart, but is configured for European voltage standards. The SCMXPRT-001/SCMXPRE-001 both have the option for DIN rail mounting as well (SCMXPRT-001D/SCMXPRE-001D). Other power supplies that meet that power requirements of the SCM5B and 8B modules can be used as well, but it is strongly recommended to use a linear power supply rather than a switch-mode power supply. Switching power supplies can add noise artifacts to the output of your modules.

The MAQ20-COMx module has to be powered through its power connector and it powers the backbone to power the I/O modules. If you powered the backbone too, then that power supply would fight the power supply from the COM module and they would likely damage each other.

Yes, ReDAQ Shape has the ability to directly copy and paste raw data from the "Analyze" tab, without interrupting the acquisition process. However, you must use the "Copy To Clipboard" button located at the top left corner of the raw data table - using keyboard commands or right clicking and selecting "Copy" will not work.

Yes, ReDAQ Shape offers the option to export data to a .txt file or Excel spreadsheet live without interrupting the data acquisition process. Simply click the "Open Data File" or "Open Excel File" button in the "Analyze" panel.

Yes, these options are available in both the User and Developer versions of ReDAQ Shape.

The SCMXPRT-001 has an option for DIN rail mounting (part number: SCMXPRT-001D) but the SCMXPRT-003 does not. Instead, it can be mounted on the SCMXRK-002 which is a 19 inch metal rack for mounting the SCMXPRT-003 as well as various Dataforth backpanels and the SCMXIF interface board.

Yes, in general, Dataforth signal conditioning modules are a direct replacement for all Analog Devices signal conditioning modules. e.g. "SCM5B35-xx: Linearized 4-Wire RTD Input Modules" will replace Analog Devices "5B35: Isolated 4 Wire RTD Input Signal Conditioning Module". Please note that Dataforth signal conditioning modules are RoHS II compliant.

The SCM5B48 could require up to 165mA max from the 5VDC power source. Check your notebook's user manual for the current available from the USB connector or contact the notebook manufacturer and ask them for details.

Yes we can provide calibration reports for the modules that you purchased. You can either a) visit https://www.dataforth.com/TestDataReport.aspx to search for Test Report Datasheets by Serial Number or b) you can send us a list of model numbers and their serial numbers to support@dataforth.com

MAQ20 configuration is best performed with ReDAQ Shape software. We do have other software for download as well. Please check out the Software Download Center. Note:The "MAQ20-945 Configuration Software Tool" was replaced with ReDAQ Shape software tool in 2017.

Yes, it is possible. The DSCA33-03 can operate on frequencies from 45Hz to 20kHz.

The DSCA38-12C conforms to EN60079-15 2005. For use in: ATEX 94/9/EC Group II Category 3 (Zone 2)

Yes, two LDM Converters / Line Drivers can be setup to communicate between two remote RS-232 terminals with only TD (Transmit Data), RD (Receive Data) and GND (Ground) signals. The setup is possible only if the communication is Simplex (one-way over two-wires) or Full-Duplex (two-way over four-wires). For Half-Duplex (two-way over two-wires) communication DTR control signal is required. Short DTR line to RLSD (Received Line Signal Detect) on both end of RS-232 terminals at the LDM connectors. The RS-232 terminals at the LDM is a DB-25 connector. For DB-25 connectors, DTR is Pin 20 and RLSD is Pin 8. If a DB-9 to DB-25 converter is used at the RS-232 terminal then short Pin 4 (DTR) to Pin 1 (RLSD or DCD - Data Carrier Detect) on the 9-pin connector.

It is possible, but less than 45Hz requires design of a custom module with 7Hz being the low limit.
Keywords/Phrases: SCM5B33, SCM5B33 low frequency, SCM5B33 lower frequency.

The DSCA33 Crest Factor additional error is specified in several ranges of 1 to 2, 2 to 3, 3 to 4, and 4 to 5. For every whole number Crest Factor 2 and greater, choose the pair with the applicable whole number to the right. That whole number is included in the range or mathematically: <=. The whole number at the left of a range is excluded from the range or mathematically: >.

Keywords/Phrases: DSCA33, Crest Factor, DSCA33 and Crest Factor

The DHCP assigned IP address cannot be read from the MAQ20-COMx module. The DHCP assigned IP address can be found if the MAQ20 system is connected to a router as this displays the addresses that the router has assigned. Keywords/Phrases: DHCP, IP address, MAQ20-COM, router

No, an external conversion resistor is not required in order to use the DSCA42 module. The current/voltage conversion is achieved by an internal resistor as shown in the block diagram in the data sheet.

Keywords/Phrases: DSCA42, internal resistor, external conversion resistor

No, the optional plug-in conversion resistor is not shipped with nor is it required in order to use the 8B32 module. The current/voltage conversion is achieved by an internal resistor as shown in the block diagram in the data sheet.

The optional plug-in resistor could be used to shunt off some of the current from the module and allow a larger input current range; then it could also be used with voltage input modules to convert a non-standard current range into an input voltage range.

Keywords/Phrases: 8B32, internal resistors, plug-in conversion resistor

No, the optional plug-in conversion resistor is not shipped with nor is it required in order to use the 8B42 module. The current/voltage conversion is achieved by internal an resistor as shown in the block diagram in the data sheet.

Keywords/Phrases: 8B42, internal resistors, plug-in conversion resistor

This information is in MA1056, MAQ20 PID Controller User Manual. You may also need some of the Modbus mapping details for the MAQ20-COMx module found in MA1040, MAQ20 COMx Hardware User Manual. These manuals are in the Media Attachments box to the right of the topic main body.

Yes, in the SCM9B series a number of modules can be ordered as continuously data streaming modules. To find out which SCM9B modules can be ordered with the data streaming option, by phone call technical support at 800 444 7644 press 2 or by email at support@dataforth.com. To order a data streaming SCM9B module add a “C” suffix to the model number, example: SCM9B-1251C accepts 4-20mA and provides streaming data on RS-232.

KEYWORDS/PHRASES: streaming, data streaming, continuous data streaming, SCM9B continuous data streaming

Dataforth signal conditioning modules were designed to have excellent stability; therefore, re-calibration is unnecessary. We recommend against user re-calibration of Dataforth modules, but if a company requires scheduled re-calibration, we do offer a re-calibration service. To obtain details, contact sales by email at sales@dataforth.com or by phone at 1 800 444 7644 press 1 for sales.

On the Unhandled exception error in the installation process in Windows XP, ReDAQ Shape needs XP updated to SP3 in order to eliminate the exception error. Perform the following steps to clear up this issue. If you have Win XP and have not installed ReDAQ Shape, perform the following steps. Update XP to SP3. Use the update link in Control Panel -> System -> Automatic Updates tab -> in the lower part of this window, click on Windows Updates Web site. This takes you to the correct part of the Microsoft web site. Download and install the Critical Updates. Install ReDAQ Shape V2.11. Reference ReDAQ Shape for MAQ20 User Manual Sections 1.3 Minimum Host Computer Requirements, 1.4 Installation, and 1.5 License Unlock Code. End If If you have Win XP and have installed ReDAQ Shape V2.11, perform the following steps. Uninstall ReDAQ Shape V2.11. In this step you have two options. You can use Control Panel -> Add / Remove Programs and remove the USB driver. This might prove to have a level of difficulty because on two different Windows XP machines I have seen the USB driver referred to by two different names: USBXpress… or Windows Driver Package – Silicon Laboratories Ports… OR you can wait until the Reinstall ReDAQ Shape V2.11 step below. Update XP to SP3. Use the update link in Control Panel -> System -> Automatic Updates tab ? in the lower part of this window, click on Windows Updates Web site. This takes you to the correct part of the Microsoft web site. Download and install the Critical Updates. Reinstall ReDAQ Shape V2.11. Reference ReDAQ Shape for MAQ20 User Manual Sections 1.3 Minimum Host Computer Requirements, 1.4 Installation, and 1.5 License Unlock Code. Here you can exercise the second option from above. Since you have already installed the USB driver, in the USB Driver Installation dialog box, you can uncheck the Install USB Driver box.

SCMVAS-Mxxx modules are high voltage input non-isolated attenuator modules. If used standalone, the module could potentially allow high voltage through to expensive data acquisition equipment. Therefore SCMVAS-Mxxx modules must be used in conjunction with an SCMVAS backpanel and an SCM5B30-07x or SCM5B40-07x isolation and signal conditioning module with input over-voltage protection.

Keywords/Phrases: 5B, 5B module, SCMVAS, SCMVAS-Mxxx

DSCA32 output resistance is: R out <= 1 Ohm

Keywords/Phrases: output resistance, DSCA32 output resistance

In the 8B33 data sheet, Note 4, For 0-5% Span measurements add 1% accuracy error (-02, -03, -04, -05) or 1.5% accuracy error (-01, -06). Accuracy error includes linearity, hysteresis and repeatability but not source or external shunt inaccuracy (if used).

Keywords/Phrases: 8B RMS, 8B True RMS, 8B RMS input module, 8B True RMS input module, 8B33 accuracy, span, offset

No, an external conversion resistor is not required in order to use the DSCA32 module. The current/voltage conversion is achieved by an internal resistor as shown in the block diagram in the data sheet.

An external conversion resistor in the case of the DSCA32 could be used to shunt off some of the current from the module and allow a larger input current range; then they could also be used with voltage input modules to convert a non-standard current range into an input voltage range.

Keywords/Phrases: DSCA32, internal resistor, external conversion resistor

That’s because the DSCA 49 and the DSCA 39 are output modules, are connected the reverse of input modules, they have their inputs on terminals 3 & 4, the system side (power supply side). They provide their outputs on terminals 6 & 7, the isolated field side.

Keywords/Phrases: DSCA, DSCA module, DSCA output module, DSCA 49, DSCA 39

The total power requirement on the 5VDC power rail is the summation of the power requirement of the individual modules as specified in each module specification. For power budget purposes, multiply the total power requirement you calculated by 1.5 for maximum power needed.

KEYWORDS/PHRASES: 8B backpanel, power consumption, power requirement, total power, total power requirement

No, the optional plug-in conversion resistor is not shipped with nor is it required in order to use the SCM7B32 module. The current/voltage conversion is achieved by an internal resistor as shown in the block diagram in the data sheet.

Keywords/Phrases: SCM7B32, internal resistors, plug-in conversion resistor

On the isolated field side of the 8B backpanel, use the shorter screw terminals that are offset to the right and marked “-“ and “+” for the inputs to the module. Use the taller screw terminals that are offset to the left and marked “-EXC” and “+EXC” for modules that provide excitation.

Keywords/Phrases: 8B, 8B module, 8B input module, 8B backpanel

There is a mechanical drawing of the SCM9B modules at the end of the 9B data sheets on www.dataforth.com. A .pdf of the drawing is also in the Media Attachments box to the right of the topic main body.

“I am generating a sine voltage signal with frequency range 0-200Hz, +/-10V using a national instruments module NI 9263 with current drive capability of 1mA. The power amplifier I am driving the sine wave generated with has an input impedance of 4K ohms .(so for a 10V sine wave input to the amplifier, it will send 2.5mA to drive it).

I am trying to double check if the SCM7B22 would be suitable for my application since it has output current capability of +/-20mA.”

It was confirmed that the SCM7B22 would be suitable for his application. I also asked him to keep in mind the 7B22 has a 400Hz bandwidth and the filter is already attenuating slightly at 200Hz. At 200Hz, the output amplitude will be about 91.4% of the input amplitude (about 8.6% attenuated).

This requires a custom designed module; we typically offer a single module custom solution with unit pricing for the required 10 piece minimum order and 7-8 week lead time. Please contact Dataforth at (520) 741-1404 if your application requires a non-standard range not offered in our product catalog.

Often times, a two module solution can help achieve the required output range. In the aforementioned case of the 5B45-08, one would connect its output to a 5B49-01 thus yielding a +/-5V output. Note that the accuracy specs will be additive across the two modules.

The user does not have to do anything special; the module operates seamlessly over the full frequency range of 45Hz to 10kHz. We needed to split the full frequency range into two ranges so we could define and specify the different accuracy levels associated with each subrange.
If you look further down the 8B33 Specifications under Accuracy, you will notice the extended frequency range carries an additional +/-1.375% Span error and +/-3.25% Span error (-06). This error is in addition to the +/-0.25% Span error at 50/60Hz. So the total accuracy error will be +/-0.25% + (+/-1.375%) = +/-1.625% Span and . +/-0.25% + (+/-3.25%) = +/-3.50% Span.

Keywords/Phrases: 8B RMS, 8B True RMS, 8B RMS input module, 8B True RMS input module, 8B33

That’s because the 8B49 and the 8B39 are output modules, are connected the reverse of input modules, they have their inputs on the system side (power supply side) of the backpanel. They provide their output on the isolated field side of the backpanel.

Keywords/Phrases: 8B, 8B module, 8B output module, 8B49, 8B39

It weighs 4.85 pounds (2.2kg, 2200g).

Keywords/Phrases: Power supply, power supplies, 5B, 5B accessories, SCMXPRT-003, weight, mass, load

That’s because the SCM7B22 and the SCM7B39 are output modules, are connected the reverse of input modules, they have their inputs on the system side (power supply side) of the backpanel. They provide their output on the isolated field side of the backpanel.

Keywords/Phrases: 7B, 7B module, 7B output module, 7B22, 7B39

The MAQ20-PWR3 is a load sharing power supply module. It can accept voltages from 7VDC to 34VDC and provide 5VDC out, to the MAQ20 backbone it is plugged into. It is designed to share the power load with the MAQ20-COMx module and provide an additional 3A to the COM module’s 3A.

Another benefit of the MAQ20-PWR3 is it can be used to provide redundant power and more than one can be added to a backbone and they and the MAQ20-COMx will all share power. Also, each added MAQ20-PWR3 module reduces the heat each one has to dissipate.

Keywords/Phrases: PWR3, MAQ20-PWR3, load sharing, boost power, boost power supply module

SCMVAS-Mxxx modules are high voltage input non-isolated attenuator modules. If used standalone, the module could potentially allow high voltage through to expensive data acquisition equipment. Therefore SCMVAS-Mxxx modules must be used in conjunction with an SCMVAS backpanel and an SCM5B30-07x or SCM5B40-07x isolation and signal conditioning module with input over-voltage protection.

Keywords/Phrases: 5B, 5B module, SCMVAS, SCMVAS-Mxxx

All Signal COMmon (SCOM) for all channels are connected to one signal common COM.

This is true for 8BP02, 8BP04, 8BP08, and 8BP16.

KEYWORDS/PHRASES: SCOM, COM, 8BP02, 8BP04, 8BP08, 8BP16, common, signal common, backpanel

0.5Nm to 0.6Nm is the recommended range.

0.6Nm is the max recommended torque, but it is still short of damage to the unit.

KEYWORDS/PHRASES: DSCA, screw terminal, DSCA screw terminal, torque

Yes, a plug-in conversion resistor is required in order to use the SCM5B42 module. The current/voltage conversion is achieved by a plug-in resistor, SCMXR1 as shown in the block diagram in the data sheet. Make sure the XR1 is installed in the back panel. The XR1 is usually shipped with the unit. If you can't locate it, please call Dataforth at 1-800-444-7644.

Yes, Output Ground Common (SCOM in DB-25 & COM in screw terminal blocks) is the same as Power Ground Common (COM in Main Power & Alternate Power screw terminal blocks).
This is true for 8BP01, 8BP02, 8BP04, 8BP08, and 8BP16.

KEYWORDS/PHRASES: SCOM, COM, 8BP01, 8BP02, 8BP04, 8BP08, 8BP16, common, signal common

Yes, as long as the 5B module is compliant with or exceeds Analog Devices Incorporated 5B specifications.

Keywords/Phrases: 5B, 5B module, backpanel, Dataforth backpanel

OPC is an acronym for OLE for Process and Control, OLE is an acronym for Object Linking and Embedding. A more contemporary meaning of OPC is Open Platform Communications. And, yes, MAQ20 does have a capacity for OPC. Call 800 444 7644 press 2 for details. Keywords/Phrases: OPC, OLE for Process and Control, Open Platform Communications

The 8B41-12 module can withstand 300VDC continuous on its input terminals without damage. However, the output voltage will go to one of the internal power supply rails and remain there for several seconds after the input returns within the specified +/-60V input range."

The SCM5B41-09 module can withstand 300VDC continuous on its input terminals without damage. However, the output voltage will go to one of the internal power supply rails and remain there for several seconds after the input returns within the specified +/-40V input range

Please the SCMXR1 is installed in the back panel; one XR1 is usually shipped with the unit. If you can't locate it, please call Dataforth at 1-800-444-7644.

Main content of text.

The System Builder is an online application within the dataforth.com Site. The builder enables users to custom configure and build data acquisition systems for the SLX200, SLX300, and MAQ20 systems.

The MAQ20 System Builder is specifically configured to guide the user through all aspects of a MAQ20 system design, from input/output modules to 8B expansions, as well as all power supplies and accessories needed.

The media attachment "Manage & Monitor MAQ20-DIOL Special Function Alarms " in the "Media Attachments" box to the right is an excerpt from the MA1043 - MAQ20-DIOL Discrete IO Module HW User Manual. This attachment describes in two sections alarm management and monitoring. Section 13.0, Alarm Functions, discusses Alarm Enabling (and disabling), Configuration, Alarm Types and Limit Types, and shows in a graphical form the alarm types, limit types, the deadband concept, and alarm functionality. Section 14.0, Setting and Monitoring Alarms, discusses through the use of a register address map, how to set alarm types, limits, and deadbands, how to set the alarm configure flag, how to enable and disable alarms, how to reset a latched alarm and how to check the status of an alarm. The end of Section 14.0 discusses how to calculate the base address and various configuration and monitoring addresses for the Pulse Counter Alarm and for the Waveform Frequency Alarm. Although this section used Pulse Counter and Waveform Frequency Alarms as examples, the register address calculations are applicable to all Special Functions.

Yes, an external conversion resistor is required for the SCM5B32 module if it is to be used as a current input module. The current/voltage conversion is achieved by an external resistor, SCMXR1 as shown in the block diagram in the data sheet.
The SCM5B32 series without the resistor can be used for voltage inputs as well.
For the SCM5B32-01 that voltage range is: +0.08V to +0.40V.
For the SCM5B32-02 that voltage range is: 0V to +0.40V.

Keywords/Phrases: SCM5B32, internal resistor, SCMXR1, external conversion resistor

The 5B42 has separate passive input connections on +In and -In and the 8B42 does not. If you notice, the - input (pin 3) on the 8B42 has NC (No Connection) to the internal circuits of the module.
The 8BB42 can only be used with passive 2-wire transmitters because the only connection into the module is through the +EXC (excitation power out) and the + (return signal current input) connection.
In the 8B product line, the customer will have to use the 8B32-01 passive current input module.

Keywords/Phrases: 5B, 5B42, 8B, 8B42, 8B32-01, passive 2-wire transmitters, passive current input

The media attachment "MAQ20-xTC Alarm Usage.pdf" in the "Media Attachments" box to the right is an excerpt from the MA1047 MAQ20-JTC/-KTC/-TTC/-RSTC Hardware User Manual.

This attachment describes in two sections alarm management and monitoring.
Section 11.0, Alarm Functions, discusses Alarm Enabling (and disabling), Configuration, Alarm Types and Limit Types, and shows in a graphical form the alarm types, limit types, the deadband concept, and alarm functionality.
Section 12.0, Setting and Monitoring Alarms, discusses through the use of a register address map, how to set alarm types, limits, and deadbands, how to set the alarm configure flag, how to enable and disable alarms, how to reset a latched alarm and how to check the status of an alarm. At the end of Section 12.0, there is a discussion on how to calculate a module's base address and various configuration and monitoring addresses.
Although this topic used material found in the MAQ20 thermocouple hardware user manual, the alarm functions and register address map are applicable to all analog input modules. You only need to calculate the module base address.

The media attachment “MAQ20-DIOL-FrequencyGenerator.pdf” in the “Media Attachments” box to the right contains selected excerpts from the MAQ®20-DIOL Discrete I/O Module HW User Manual. The first three pages of Section 12.0 describe how to access the MAQ20-DIOL Special Functions directly through the Modbus registers. They also describe which Timers use which inputs and outputs to perform their functions. Section 12.5 focuses in on the Frequency Generator function describing which Timers use which outputs. Additional features. such as, minimum and maximum frequencies and accuracy specs, how the outputs are enabled and disabled, a graphic of the typical waveform, the effects of the various forms of reset, etc. Also a review of Section 15.0 Reset Functions will be helpful. Section 19.0 covers the MAQ20-DIOL Address Map, focusing in on the Frequency Generator function in the Special Function 5 Table. The media attachment “MAQ20-DIOL-FrequencyGeneratorExample.pdf” in the “Media Attachments” box to the right contains an excerpt from the ReDAQ Shape for MAQ®20 User Manual. In Section 3.5, Discrete Input-Output Module, under the Special Function bullet, Example 1 describes how to configure the Frequency Generator Special Function and then how to operate it in ReDAQ Shape software.

A shield connection on an isolated signal conditioner is most effective when connected to a low impedance I/O terminal on the isolated circuit. However, since the field terminals are isolated, there still is no path to earth ground in a system. An AC path to system ground can be established by connecting a high voltage capacitor from the field I/O shield termination to earth ground. This preserves the isolation. Newer MAQ20 Data Acquisition I/O modules from Dataforth offer screw terminals for shield termination on field I/O terminal blocks and have internal high voltage capacitors spanning the isolation barrier, providing an AC path between field wiring shield and system earth ground.

Keywords/phrases: shield, shield connection, isolated signal input

If you are inquiring about the ISO-RACK 16, Dataforth does not make that. Please look up www.mccdaq.com; they make the ISO-RACK 16 and accessories.

If you wish to purchase Dataforth backpanels and accessories, you can look up www.dataforth.com. The base model number for our 16 channel backpanel is SCMPB01 and our ribbon cables are 26 conductor and their base model number is SCMXCA004. I have included a link to the .pdf of the backpanels and accessories data sheet in the following line.

http://www.dataforth.com/catalog/pdf/scm5baccs.pdf.

There is no extra charge for the extended frequency range in the DSCA33. If you look in the DSCA33 Specifications under Accuracy, you will notice the extended frequency range carries an additional +/-0.75% of Reading error. This error is in addition to the +/-0.25% Span error at 50/60Hz. So the total accuracy error will be +/-0.25% + (+/-0.75%) = +/-1.00%.

Dataforth modules are all designed to be highly stable, thus they do not require re-calibration.

8B modules cannot be re-calibrated in the field, but they can be re-calibrated by Dataforth.

We do offer a re-calibration service. For details, please contact sales by email at sales@dataforth.com or by phone at 1 800 444 7644 press 1 for Sales.

You install one jumper from the +EXC to the +In terminals and the other jumper from the –EXC to the –In terminals. This allows the traces on the backpanel and the traces in the module to the current shunt to share the excess current.

Keywords/Phrases: SCM5B33-06, SCM5B33-07, included jumpers, excess current

For most MAQ20 input modules the throughput rate is 15ms/module, 66.7Hz/module, or 66.7samples/sec/module.

Keywords/Phrases: MAQ20 throughput , MAQ20 sample rate, MAQ20 scan rate, data acquisition throughput

“ If you are inquiring about the ISO-RACK 16, Dataforth does not make that. Please look up www.mccdaq.com; they make the ISO-RACK 16 and accessories.

If you wish to purchase Dataforth backpanels and accessories, you can look up www.dataforth.com. The base model number for our 16 channel backpanel is SCMPB01 and our ribbon cables are 26 conductor and their base model number is SCMXCA004. I have included the web address of the .pdf of the backpanels and accessories data sheet in the following line.

www.dataforth.com/catalog/pdf/scm5baccs.pdf

Keywords / Phrases:

ISO-RACK16, 34-conductor ribbon cable, SCMPB01, 26-conductor ribbon cable

The media attachment "MAQ20ModuleRegistrationStrategies.pdf" in the "Media Attachments" box to the right is an excerpt from the MAQ20 Communications Module HW User Manual.pdf. This attachment describes in three sections the standard and alternate setup processes involved in Building a System, Section 7.0, Maintaining a System, Section 8.0, and Expanding a System, Section 9.0. In addition, MAQ20 I/O Module Registration, Section 10.0, provides a functional description of the automated registration process and information about tools enabling user reassignment of Registration Numbers. Calculated examples of: a write to the Module Detect Register at I/O module address 98 plus the module offset based on Registration Number will trigger a module to visually self-identify by blinking the STAT LED and how to calculate the base address for reading 16 channels of Current Data for a MAQ20-VSN module.

The media attachment "MAQ20-DIOLSpecialFunctions.pdf" in the "Media Attachments" box to the right is an excerpt from the MAQ20-DIOL Hardware User Manual.pdf. This attachment discusses Special Function setup and operation in eight sections starting with 12.0 Special Function Description and Configuration; continuing with 12.1 Special Function 1: Pulse / Frequency Counter, 12.2 Special Function 2: Pulse / Frequency Counter with Debounce, 12.3 Special Function 3: Waveform Measurement, 12.4 Special Function 4: Time Between Events, 12.5 Special Function 5: Frequency Generator. 12.6 Special Function 6: Pulse Width Modulation Generator, and 12.7 Special Function 7: One-Shot Pulse Generator.

If only the screw terminals at power connector side are used for RS232 signals (i.e. not the DSUB connector), could a DCP485-S be one to one replaced by a DCP485-P without any wiring change? Yes it can since the type of RS-232 port to which the DCP485 is connected is not being changed. Should TD / RD terminals be swapped? No. Should DTE/DCE switch position be changed? No. In all of the above cases, the only change is in the DB-9 connector changing from sockets to pins, but the type of RS-232 port to which the DCP485 is connected is not being changed. If the RS-232 port was being changed from Data Terminal Equipment (DTE) to Data Communications Equipment (DCE), then either the TD/RD terminals would have to be swapped or the DTE/DCE switch position would have to be changed.

The main difference is the SCM7B41 is an input module and the SCM7B22 is an output module.
This means that.

The 7B41 module has its input on the isolated field side of the module connect to it through screw terminal blocks. The 7B41 module has its output on the system and power supply side of the module connect to it through DB-25 connector (SCM7BP01, SCM7BP02, SCM7BP04, SCM7BP08, and SCM7BP16).

The 7B22 module has its output on the isolated field side of the module connect to it through screw terminal blocks.
The 7B22 module has its input on the system and power supply side of the module connect to it through DB-25 connector (SCM7BP01, SCM7BP02, SCM7BP04, SCM7BP08, and SCM7BP16).

Keywords/Phrases: 7B, 7B module, 7B input module, 7B output module, 7B22, 7B41

For Zero Crossing, connect the signal to EXC+ and the return to IN+. For TTL, connect the signal to IN- and the return to IN+.

All SCM7B backpanels, including SCM7BP02 and SCM7BP04 have CJC sensors installed by default in every field input terminal in every channel. There is no separate model number for including CJC sensors as in SCM5B and 8B backpanels.

KEYWORDS/PHRASES: SCM7B backpanels, CJC sensors

The 8B51-12 can accept up to +/-60V input.
It has >500k Ohms input and <1 Ohm output resistance.
It could be sampled at 250kHz, but it will present unchanging data within +/-0.08% up to 92% of the samples. For it to provide new data it can be sampled up to a 20kHz sample rate.

The 8B51-03 has an output resistance < 1 Ohm.
Its filter is a five-pole low pass filter which attenuates gradually up to the -3dB frequency of 20kHz above which it attenuates sharply at 100dB per decade of frequency. The filter has no overshoot because it is critically damped.

This application can be solved with three DCP485 devices. Open the diagram from the DCP485 User Manual Figure 2 located in the Media Attachments box to the right of this Content box. You would connect the master into one of the center positions. Its termination DIP switches need to be set as described in the text in the diagram. Since you have only three devices, just ignore the second device in the center positions. The remote units should be connected into the left and right positions in the above diagram and their termination DIP switches need to be set as described in the text in the diagram. The DCP485 User Manual located in the Media Attachments box to the right of this Content box describes how to configure the other features of the DCP485. Keep in mind, the DCP485 is an electrical interface converter only and therefore does not have any addressing capabilities. That will have to be in the devices connected to the RS-232 side of the DCP485’s.

Yes. However, keep in mind, when those terminals are not connected together, the module offers up to 1500Vrms isolation of the output section from the power section.
When those terminals are connected together, that isolation is cancelled, so the input of the device the module output is driving can no longer float.

Module still retains 1500Vrms withstand capability to the T/C or other type of input when pin 6 and 8 are tied together.

Static shielding bags are not necessary since the 8B backpanels are not ESD sensitive. The risk of physical damage is greater than the risk of ESD damage.

Keywords/Phrases: 8B backpanel, 8B backpanel ESD sensitivity, ESD, ESD sensitivity

MAQ20-940, ReDAQ Shape, is an electronic only product for download from www.dataforth.com. Keywords/Phrases: MAQ20–940, ReDAQ Shape

Please send Dataforth the selections for the four configurable parameters of the SCM5B48.
Below are the parameters in the order they appear left to right in the data sheet, Figure 2: SCM5B48 Side Label.

High Pass Filter, S5: DC, 0.2Hz, 10Hz
Gain, S4: 1, 10, 100
Excitation, S1: 4mA, 9mA
Low Pass Filter, S3, S2: 2.5kHz, 5kHz, 10kHz, 20kHz

Dataforth will assign custom module number, generate a data sheet, and send it for review and signoff.

Keywords/Phrases: SCM5B48 fixed-parameter, SCM5B48 preset-parameter, fixed-parameter, preset-parameter

The module dimensions of the SCM9B Series can be found on a drawing in www.dataforth,com. In the upper left of the home page under Explore our product offerings, point and click on Signal Conditioning, point and click on 9B Analog to Serial Isolated Modules. In the center column of the next page under SCM9B Series Product Family, click on the Adobe Acrobat symbol to the right of Dimensions. This displays a .pdf drawing of SCM9B module dimensions. The drawing maybe downloaded and saved.

A .pdf of the drawing is also in the Media Attachments box to the right of this topic's main body.

Keywords/Phrases: SCM9B, SCM9B mounting holes, SCM9B mechanical drawing, SCM9B dimensions drawing 9B dimensions drawing

PT3E is a commercial product, temperature range 0-70°C. Further the power cable to the transformer has a molded plug with 2 pins. Generally it should have 3 pins, the third pin being earth ground for an industrial power cord. Why is it not so? Once again, the PT3E is commercial product meant to be compatible with many regions of the world. The users in a region with significantly different outlet configuration generally buy their own adapter. Keywords/Phrases: LDM, PT3E

Contemporary computers do not have RS-232 ports, but USB ports instead. However, there are many USB to RS-232 adapters available. If the adapter is to be used with a device which uses the Modbus protocol or will be installed in a system which uses the Modbus protocol, the adapter must either be specified for use with Modbus or must be tested on a Modbus device for proper communications functioning. Selection criteria for Data Acquisition products: MAQ20-COM2, SLX300-10 These devices have USB ports. If an additional communications channel is needed, a USB RS-232 adapter can be used. The adapter in this case does not need handshake signals included. These devices both use the Modbus protocol. Selection criteria for Data Communications products: DCP485, LDM70, LDM85, LDM422, LDM485 These devices are externally powered and use transmit data, receive data, and ground for communications, and use various handshake signals to control particular functions. Refer to the specific user manual in the Media Attachments area to the right of this Content main body for usage instructions. DCP35, LDM35, LDM80 These devices are powered from the handshake and the transmit and receive data signals. The adapter in this case should have the handshake signals included. If the adapter does not have handshake signals included, use it for the transmit and receive data signals and power the device handshake inputs from separate positive and negative power supplies. Since the adapter could be installed between two computers and either one could initiate a data transfer, the adapter should be able to allow not only the USB side but also the RS-232 side to initiate the data transfer. LDM30 This device is externally powered and uses only transmit data, receive data, and ground for communications. RTS is connected to CTS internally. DTR, DSR, and RLSD (DCD) are connected to each other internally. The adapter in this case does not need handshake signals included. If there is a system requirement for handshake signals, then choose an adapter with handshake signals included. Selection criteria for Signal Conditioning products: SCM9B-A1000/A2000 These devices are externally powered and use only transmit data, receive data, and ground for communications. Handshake signals CTS, DSR, and RLSD (DCD or CD) are internally biased to their asserted state or high state, a positive voltage. The adapter in this case does not need handshake signals included. If there is a system requirement for handshake signals, then choose an adapter with handshake signals included.

Below are the SCM5B48 configurable parameters and their associated DIP switch designators in the order they appear left to right in the data sheet, Figure 2: SCM5B48 Side Label.

High Pass Filter, S5: DC, 0.2Hz, 10Hz

Switch S5 selects between DC coupling or AC coupling and between 0.2Hz or 10Hz low end of the High Pass filter cutoff frequencies.

Gain, S4: 1, 10, 100

Switch S4 selects from among the Gain settings = 1, 10, or 100. Since the output range is a fixed +/-10V -01 or +/-5V -02, the implication of this is that switch S4 actually selects the input voltage range as in the formula Vin = Vin max / G. Example: in an SCM5B48-01, S4 =10 the input voltage range is Vin = +/-10V / 10 = +/-0.1V.
Keep in mind, for DC coupling Vout = VAC + VDC which is limited to +/-10V total for -01 and +/-5V total for -02.

Excitation, S1: 4mA, 9mA

Switch S1 selects between excitation current sources of 4mA or 9mA +/-10%. They both have a compliance voltage of 24V +/-10%.

Low Pass Filter, S3, S2: 2.5kHz, 5kHz, 10kHz, 20kHz

Switch S3 and S2 select from among the Low Pass filter cutoff frequencies of 2.5kHz, 5kHz, 10kHz, or 20kHz.


Keywords/Phrases: SCM5B48, SCM5B48 DIP switches, SCM5B48 settings

These iso amps do not require external resistors as those are built in. Each model has a fixed gain as determined by the output voltage range divided by the input voltage range. One caution: the input models such as the SCM5B40 series are limited to +/-2mA output current in order to remain within their accuracy spec. Keywords/Phrases: Isolation amplifiers, isolation amps, iso amps, input modules, op amps

The best place to find information about this is in the MAQ20 COMx Hardware User Manual, Section 21.0 Throughput, pages 34 through 37 of 40.

Dataforth input module bandwidth design platform does not support bandwidths > 20kHz. Keywords/Phrases: mV in V in modules Bw>20kHz

Yes. Replacement terminal blocks are the following.

DSCAX-01 labeled 1 2 3 4.

DSCAX-02 labeled 5 6 7 8.

Keywords/Phrases: DSCA terminal blocks, replacement terminal blocks, DSCA replacement terminal blocks, DSCT terminal blocks, DSCT replacement terminal blocks

All Dataforth Thermocouple (TC) input modules need a Cold Junction Compensation (CJC) sensor. The following TC input modules need an external CJC sensor which is built into the data acquisition system (SLX300) or can be ordered as an option of the data acquisition system (SLX200) backpanel or as a component sold separately. SCM5B37, SCM5B47, 8B37, and 8B47 The following TC input modules need an external CJC sensor which is built in to the backpanel terminal blocks. SCM7B37, and SCM7B47 The following TC input modules do not need an external CJC sensor; it is built in to each module. DSCA37, DSCA 47, DSCT37, DSCT47, DSCP20, DSCP62, and SCTP20 The following TC input modules do not need external CJC sensors; they are built in to each module. MAQ20-JTC, MAQ20-KTC, MAQ20-TTC, MAQ20-RSTC Keywords/Phrases: Thermocouple input module, TC input module, Cold Junction Compensation sensor, CJC sensor

It is true you do not need to have a PC connected to record the data to the SD card. However, you will need the PC connected in order to set up what to record and how much and to start recording, refer to the MAQ20-COM2/-COM4 Hardware User Manual, Section 13.0 SD Card Operation, pages 17 through 19 of 40. Once the recording has started, you can disconnect the PC in software from the MAQ20 system and then disconnect the communication cable physically. Recording the data; then you will need the PC connected once again to stop recording which also closes the data file. There is an alternate method: remote operation and remote retrieval of data through a built-in FTP Server. Refer to MAQ20-COM2/-COM4 Hardware User Manual, Section 16.0 Remote Operation via Direct Internet Connection, pages 25 through 26 of 40. Refer to MAQ20-COM2/-COM4 Hardware User Manual, Section 14.0 Retrieving Data from the SD Card – Manual or FTP Server, pages 20 through 25 of 40. The above sections of the manual are in the Media Attachments box to the right of this topic’s main body.

The failures of the Voltage Regulator, Transformers, Oscillator, Analog Switch and the Power Supply Capacitors would cause the module output to go to 0V and the supply current will be 0mA. This failure mode may be accompanied by module supply current many times higher than published specification. These are the common failure modes. Other failure mode may result in output pegging to the output supply rail at 7.5V.

The Inputs are passive nodes and the input failures can cause the module output to go to 0V for both SCM5B41 and SCM5B36 series. The input failures of SCM5B36 may also peg the output to the negative supply rail of -7.5V.

The MTBF (Mean Time Before Failure) for SCM5B36 series is 675,000 hours and the same for SCM5B41 series is 680,000 hours. This failure rate calculation is derived from the MIL-HDBK-217 (Reliability Prediction of Electronic Equipment). The "Part Stress Analysis" method is used at a ground benign environment, +30°C temperature, and quality level B-2 to D-1 depending on the component. The specified humidity level is 95% RH noncondensing.

Keywords/Phrases: SCM5B failure modes, SCM5B36 failure modes, SCM5B41 failure modes

That’s because the SCM5B39 and the SCM5B49 are output modules, are connected the reverse of input modules, they have their inputs on the system side (power supply side) of the backpanel. They provide their output on the isolated field side of the backpanel.

Keywords/Phrases: 5B, 5B module, 5B output module, 5B39, 5B49

I’m having trouble getting the DCP35 to communicate with a datalogger. To connect to the DCP35, open or download the DCP35 data sheet from the Media Attachments box to the right of this Content box or the DCP35 User Manual from the Media Attachments box to the right of this Content box. The important aspect of the DCP35 is providing it with sufficient power for it to send data over usable distances at a reasonable data rate. That said, pay special attention to the power specifications in the data sheet and to the “Power Requirements” and “Cable Capacitance Effects On Distances” sections of the user manual.

The DSCA42-01C internal electronics is powered by an overall power supply and then the module output circuitry provides the output current whose return side (or negative side) is connected internally to the power supply common. This causes the output signal to be positive with respect to the common.

Whereas, the DSCL23 is loop-powered through its output terminals. That puts the 4-20mA receiver (the load) in series with the power supply. So when you measure the voltage from the power supply common (- terminal) to the other side of the load you will see a negative signal. The module could be made usable if the power supply has a fully floating output and you can make terminal 1 (the return current terminal) the common and measure the positive signal across the load from the power supply (-) to terminal 1 (the return current terminal), the common.

A better match for your application is the DSCA42-01C. Its internal electronics is powered by an overall power supply and then the module output circuitry provides the output current whose return side (or negative side) can be connected to the power supply common. This causes the output signal to be positive with respect to the common.

Keywords/Phrases: 4-20mA isolator with loop power, 2-wire transmitter interface signal conditioner with loop power

To connect to the MAQ20 COMx, open or download the MAQ20-COMxPinouts page from the Media Attachments box to the right of this Content box. Table 2 shows the pinouts of the RJ-45 jack for RS-232, RS-485 4-wire, and RS-485 2-wire. Or visit www.dataforth.com. In the top tool bar point to Software, scroll down to and click on MAQ20. Under Manuals, scroll down to and click on MAQ20 COMx Hardware User Manual. In Section 4.0, page 3 of 40, Table 2 shows the pinouts of the RJ-45 jack for RS-232, RS-485 4-wire, and RS-485 2-wire.

Since some USB ports provide 5VDC power, it would make sense to use them to power some accessory devices. Before you use a USB port to power a Dataforth device, use the following check list to verify the feasibility. Sum all the typical 5VDC current requirements of the Dataforth devices you plan to use in your application. To find out the maximum power budget, multiply the total typical current requirements by 1.5 and compare this to the total current available from the USB port. Since Dataforth 5VDC powered devices require a +/-5% tolerance, check that the voltage is not > 5.25VDC and not < 4.75VDC with the intended load connected. Also check that the max ripple of the USB port with the full load connected is < 100mVp-p. Keywords/Phrases: USB port max current available, USB port max power available, USB port max ripple

SCMVAS-Mxxx modules are actually DC attenuators because they are specified using + and – voltage limits. These are DC voltage levels or peak AC voltages. If they were meant to be AC voltage attenuators, they would be specified in Vrms.

Keywords/Phrases: 5B, 5B module, SCMVAS, SCMVAS-Mxxx, attenuation, high voltage

To mount the module, do the following.
With the DIN rail mounted horizontally on a vertical panel, hang the hook at the top rear of the module over the top edge of the DIN rail.
Then rotate the module down so the bottom rear corner of the module touches the bottom edge of the DIN rail.
Then push on the bottom front corner of the module until you hear and feel a click. Push and pull the front of the module to ensure it is securely held on the DIN rail.

To remove the module, do the following.
Using a small screwdriver, insert it into the slot on the movable clip (red for DSCA & DSCT) under the bottom rear corner of the module.
Rotate the body of the screwdriver toward the body of the module until the movable clip disengages the bottom edge of the DIN rail and you can rotate the module upward.
Then you can unhook the module from the top edge of the DIN rail.

Keywords/Phrases: DSCA, DSCT, DIN rail module, mounting, removing

No, an external loop power supply is not required in order to provide output loop current. The DSCAxx-xxC and –xxE current output modules have what is known as an active current output. They source the loop current out of their output terminals.

Keywords/Phrases: DSCA, DSCA current loop output, external loop power, external loop supply, external loop power supply

The user does not have to do anything special; the module operates seamlessly over the full frequency range of 45Hz to 20kHz. We needed to split the full frequency range into two ranges so we could define and specify the different accuracy levels associated with each subrange.
If you look further down the 5B33 Specifications under Accuracy, you will notice the Standard frequency range from 45Hz to 1kHz carries an additional +/-0.25% Reading error. This error is in addition to the +/-0.25% Span error at 50/60Hz. So the total accuracy error will be +/-0.25% Span + (+/-0.25% Reading) = +/-0.50%.
And the Extended frequency range from 1kHz to 20kHz carries an additional +/-0.75% Reading error. This error is in addition to the +/-0.25% Span error at 50/60Hz. So the total accuracy error will be +/-0.25% Span + (+/-0.75% Reading) = +/-1.00%.

Keywords/Phrases: 5B RMS, 5B True RMS, 5B RMS input module, 5B True RMS input module, 5B33

LDM and DCP devices are electrical interface converter and line driver devices which convert RS-232 signals to current loop or differential voltage signals to go the distance and reconvert them at the far end to RS-232 signals. LDM and DCP devices are transparent to the data rate, that is, they can operate on any standard or non-standard data rate from zero up to their max specified data rate without having to set a particular data rate. Data rate from zero? That’s right data rate from zero, meaning that the devices are static comm devices. As long as the input signal holds a voltage level corresponding to a 0 or 1 logic level, the output signal will hold that same logic level. They do nothing more to the data than transfer it from their Dsub connectors to their output field-side terminals and from their input field-side terminals to their Dsub connector. They do not care about data formatting or timing gaps; they just pass through and retransmit the logic levels present on their inputs. Keywords/Phrases: LDM, DCP, Modbus, line driver, converter

The SCM7B series is defined for the process industry which has a preference for unipolar signals on the system / power supply side of the module. In fact , there is a preference for a positive offset above a zero current or voltage output, such as, 4-20mA rather than 0-20mA, 1-5V rather than 0-5V, and 2-10V rather than 0-10V.

Keywords/Phrases: SCM7B bipolar input / bipolar output, SCM7B bipolar output, bipolar output

Nominal Logic Voltage (Vcc) is the module power supply voltage and is +5V. Maximum Logic Voltage is +6V. The output voltage is from an external power supply and there fore can be higher than the module Logic Voltage and is specified at a maximum of 30V.

Keywords/Phrases: SCMD, MIDC, MIDC5, SCMD-MIDC, SCMD-MIDC5

Think of the backpanel as a bidirectional signal transfer device whose direction is determined by the module in a particular channel.
For an input module, the signal is transferred from the field-side screw terminals to the system/power supply-side screw terminals or to a signal access ribbon cable header or D-sub connector.
For an output module it is just the reverse, the signal is transferred from the system/power supply-side screw terminals or from a signal access ribbon cable header or D-sub connector to the field-side screw terminals.

Keywords/Phrases: backpanel, 5B backpanel, 7B backpanel, 8B backpanel, SCMD backpanel

On the SCMPB01, SCMPB02, SCMPB05, and SCMPB06 backpanels the threaded bolt is directly connected to I/O COM and to an array of jumpers which enable a variety of grounding configurations. In the Attachments box to the right of this Content box, open or download the SCMPB01 or SCMPB02 data sheet. For a thorough discussion of grounding configurations, refer to the Grounding section.

The max operating output current, which still allows the output voltage to remain within accuracy specs, for SCM5B input modules is +/-2mA.
The above limit allows a 5V output range module a >= 2.5k Ohm load.
The above limit allows a 10V output range module a >= 5k Ohm load.
The output current limit for SCM5B input modules is 8mA. At this current level the output load is 0 Ohm or a shorted output.

Keywords/Phrases: SCM5B output current, SCM5B input modules, max operating output current, output current

Neither the SCM9B-A1000 nor the SCM9B-A2000 has DIN rail mounting.
The SCM9B-D192, a DIN rail mountable module, is the closest equivalent of the SCM9B-A2000.

Keywords/Phrases: SCM9B DIN rail mounting, SCM9B DIN rail module

The DSCA and DSCT zero and span adjustments are made using trimpots located under the front panel label and are non-interactive for ease of use. The trimpot screw heads are behind perforated circular knockouts labeled Ø and <->. The screw heads are slotted to accept a narrow flat blade screwdriver. The zero and span adjusters are 25Turn trimpots.

Keywords/Phrases: DSCA zero, DSCA span, DSCT zero, DSCT span, DSCA adjustment, DSCT adjustment, trimpots

Measure the RTD with an ohmmeter. If it is near the specified resistance for its type, then it is likely good.
If an RTD is not available, power the module.
Connect 100 Ohms across terminals 5 and 7 and connect a shorting jumper across terminals 5 and 6.

For DSCA34-01, measure about 5V across output terminals 3 and 4.
For DSCA34-01C, measure about 12mA across output terminals 3 and 4.
For DSCA34-01E, measure about 10mA across output terminals 3 and 4.

Keywords/Phrases: DSCA34, DSCA34 troubleshooting, Pt100, platinum, nickel, RTD

No, but this function can be implemented with a two or three channel loop isolator, such as DSCL22-11, DSCL22-21, DSCL24-11, or DSLC24-12. Connect all inputs in series with each other. Sum together all input burden voltages so as not to exceed the maximum loop voltage available.

Keywords/Phrases: DSCL, DSCL one input multi-output loop isolator, one input multi-output loop isolator

You must put the SLX200 into a known communications state. To do this, with the SLX200 powered, pull the CRST jumper off both pins then re-install the jumper over both pins. To locate the CRST jumper, open or download the SLX200 H/W User Manual from the Media Attachments box to the right of this Content box and refer to Section 6.3. Then power cycle the SLX200. This resets the communications interface to Factory Default conditions. Communications Interface: RS-232 Device ID: 31 Data Rate: 19.2kbps Parity: Even Plug an RS-232 cable into the RS-232 RJ-45 port on the SLX200. Using the SLX200 Configuration Software, in the top tool bar, click on Configure, then click on Modbus RTU Interface. In the RS-232 text window, click on the down triangle and click on the desired RS-485 2-wire or RS-485 4-wire. Click on the Configure button. Disconnect the RS-232 cable. Power cycle the SLX200. Plug the RS-485 cable into the RS-485 RJ-45 port on the SLX200. Start sending Modbus functions to the SLX200.

This can be done only if the voltage source is floating (isolated); this pertains also to the SCM7B modules.
Better modules for true differential operation for which a floating source is not needed are the DSCA30/31/40/41. Other modules for this type of operation are the SCM5B30/31/40/41 used with an SCMPB07-x with the I/O COM jumpers Jn removed in the channels for which true differential operation is desired. Both the DSCA and the SCM5B outputs can float +/-50V with respect to power supply common.

Keywords/Phrases: 8B51, reverse input leads, true differential

MAQ20-BRDG1 can measure any millivolt signal as long as it is within the limits specified for input voltage defined by sensitivity multiplied by excitation voltage and within the bandwidth. Where strain, load, weight, stress, etc. need to be measured, that is in part dependent on the sensor and how it converts those parameters into millivolts and in part on scaling in software. Keywords/Phrases: MAQ20-BRDG1, strain, strain gage, strain gauge, load cell

Since no Dataforth products are Dual Use, they are classified EAR99, no license required. Keywords/Phrases: Dual Use, ECCN, EAR99

The total power requirement on the DC power rail is the summation of the power requirement of the individual modules as specified in each module specification. For power budget purposes, multiply the total power requirement you calculated by 1.5 for maximum power needed.

Keywords/Phrases: 7B backpanel, power consumption, power requirement, total power, total power requirement

Yes, Dataforth has the SCMD-MODC5ML which can switch up to 5A DC from an off-state voltage up to 50VDC.

The basic data sheet can be found in the Dataforth Full-Line Catalog under SCMD–MOAC/MODC Miniature Digital Output Modules and at www.dataforth.com at the upper left, under Explore our product offerings:, click on Signal Conditioning. Then click on Isolated Digital I/O Modules. In the top center of the next page, click on the Adobe Acrobat symbol to the right of SCMD–MOAC/MODC. At the right edge of the page in a text box labeled Datasheet, click on SCMD Specifications for detailed specifications of all Digital I/O Modules.

Keywords/Phrases: SCMD, SCMD–MOAC/MODC, SCMD-MODC, -MODC, Digital Output Modules, current, high, 3A, 5A

Dataforth does not sell the edge card connectors for the Digital I/O Backpanels, SCMD-PBxxxx. We do offer information about the part numbers and manufacturers of the connectors in the following lines.

Part Number Manufacturer
66317-150 FCI-Berg
3415-0001 3M

This information can also be found in the Dataforth Full-Line Catalog under SCMD Accessories Digital I/O Module Backpanels and at www.dataforth.com at the upper left under Explore our product offerings:, click on Signal Conditioning. Then click on Isolated Digital I/O Modules. In the top center of the next page, click on the Adobe Acrobat symbol to the right of Accessories.

Keywords/Phrases: SCMD, SCMD-PB, -PB

The user does not have to do anything special; the module operates seamlessly over the full frequency range of 45Hz to 20kHz. We needed to split the full frequency range into two ranges so we could define and specify the different accuracy levels associated with each subrange.
If you look further down the DSCA33 Specifications under Accuracy, you will notice the Standard frequency range from 45Hz to 1kHz carries an additional +/-0.25% Reading error. This error is in addition to the +/-0.25% Span error at 50/60Hz. So the total accuracy error will be +/-0.25% Span + (+/-0.25% Reading) = +/-0.50%.
And the Extended frequency range from 1kHz to 20kHz carries an additional +/-0.75% Reading error. This error is in addition to the +/-0.25% Span error at 50/60Hz. So the total accuracy error will be +/-0.25% Span + (+/-0.75% Reading) = +/-1.00%.

Keywords/Phrases: DSCA RMS, DSCA True RMS, DSCA RMS input module, DSCA True RMS input module, DSCA33

The quickest way to find SLX940 ReDAQ Shape Software is on www.dataforth.com. In the upper left of the home page, under Explore our product offerings: follow this path: Data Acquisition and Control --> MAQ20 Modular Data Acquisition System --> In the Related Topics box, click on MAQ20 User Manuals and Software Download Center --> in Application Software box top center of page, click on MAQ20-940 ReDAQ Shape for MAQ20 - Developer. Or alternately. In the upper left of the home page, under Explore our product offerings: follow this path: Data Acquisition and Control --> ReDAQ Shape Graphical Software (for MAQ20) --> ReDAQ Shape for MAQ20 Software box, the top center of the page, click on Download Center --> in Application Software box top center of page, click on MAQ20-940 ReDAQ Shape for MAQ20 - Developer. Keywords/Phrases: SLX940, ReDAQ, ReDAQ Shape, MAQ20 Software

The max base power in all 5B33 modules is +5VDC x 140mA(max) = 700mW.

For Vout models, 5B33-01 to 5B33-07, add: 5V x 2mA = 10mW.
For Vout models, 5B33-01D to 5B33-07D, add: 10V x 2mA = 20mW.
For 0 to 1mA current loop output modules, 5B33-01B to 5B33-07B add 3mW.
For 0/4 to 20mA current loop output modules, 5B33-01C,E to 5B33-07C,E add 60mW.

The 5B33-06 has a 0.1? current shunt. Add 1A^2 x0.1? =100mW.
The 5B33-07 has a 0.025? current shunt. Add 5A^2 x0.025? = 625mW.

Keywords/Phrases: 5B33 power, 5B33 total power, 5B33 power consumption, 5B33 total power consumption, mW, watt, watts, milliwatts, heat, dissipation

This should be possible using the Ethernet port on each of the MAQ20 systems and an appropriate DSL modem. Configure each of the MAQ20 systems with a unique static IP address and then interface to them using ReDAQ Shape for MAQ20 or IPEmotion with the Dataforth Plug-in. Keywords/Phrases: MAQ20 networking , MAQ20 to ADSL network

An external load resistor is required only if the input does not have an internal current to voltage conversion resistor.
Find out the maximum load resistance the output can drive. The maximum load resistance the DSCAxx-xxC, -xxE output can drive is 600 Ohms.
Find out the voltage range the input can accept. Be sure to include the voltage drop at 20mA for the resistance of the length of the lead wires. To calculate the required load resistance, divide the maximum input voltage required by 20mA. The result is the load resistance your application needs to operate properly.

Example: Rin = Vin / 20mA Rin = 10V / 0.02A = 500 Ohms
Lead wire margin allowance example:
Vwire = Rout max x 20mA – Vin Vwire = 600 Ohms x 0.02A – 10V = 12V – 10V = 2V

Keywords/Phrases: DSCA, DSCA current loop output, external load resistor, impedance, ohms

No. However, a 4-channel DIN mount SCM5B backpanel can be made from the following list of parts. Quantity Model Description 2 SCMPB04 or SCMPB04-1 2-channel 5B backpanel with SCMXCJC or without SCMXCJC 2 SCMXBEFE DIN mount base element with snap foot 2 SCMXSE DIN mount side element 4 SCMXVS DIN mount connection pins Or, alternately, if you already have SCMPB04-2 or SCMPB04-3. Quantity Model Description 1 SCMPB04-2 or SCMPB04-3 2-channel DIN mount 5B backpanel with SCMXCJC or without SCMXCJC Just add the following. Quantity Model Description 1 SCMPB04 or SCMPB04-1 2-channel 5B backpanel with SCMXCJC or without SCMXCJC 1 SCMXBEFE DIN mount base element with snap foot 4 SCMXVS DIN mount connection pins

No. However, Dataforth does have two and three-channel 4-20mA isolators as shown in the following table.

Model Description
DSCL22-11 2-channel 4-20mA isolator
DSCL22-21 3-channel 4-20mA isolator
DSCL23-02 2-channel 4-20mA Isolator with DC Supply for 2-wire transmitter
DSCL24-11 2-channel 4-20mA isolator

Keywords/Phrases: 4-20mA isolator, 4-channel 4-20mA isolator, 4-channel 4-20mA DIN mount isolator

No, an external conversion resistor is not required in order to use the DSCT32 module. The current/voltage conversion is achieved by an internal resistor as shown in the block diagram in the data sheet.

An external conversion resistor in the case of the DSCT32 could be used to shunt off some of the current from the module and allow a larger input current range; then they could also be used with voltage input modules to convert a non-standard current range into an input voltage range.

Keywords/Phrases: DSCT32, internal resistor, external conversion resistor

In Note 4, For 0-10% Span measurements add 0.25% accuracy error (-02 through -07) or 1.00% accuracy error (-01). Accuracy error includes linearity, hysteresis and repeatability but not source or external shunt inaccuracy (if used).

Keywords/Phrases: 5B RMS, 5B True RMS, 5B RMS input module, 5B True RMS input module, 5B33 accuracy

The main difference is the DSCA41 is an input module and the DSCA49 is an output module, which means:

A. The DSCA41 module has its input on the isolated field side of the module, connected to it through screw terminals 6 and 7. The DSCA41 module has its output on the system and power supply side of the module, connected to it through screw terminals 3 and 4.

B. The DSCA49 module has its output on the isolated field side of the module, connected to it through screw terminals 6 and 7. The DSCA49 module has its input on the system and power supply side of the module, connected to it through terminals 3 and 4.

Keywords/Phrases: DSCA, DSCA module, DSCA input module, DSCA output module, DSCA41, DSCA49

The total power requirement on the 5VDC power rail is the summation of the power requirement of the individual modules as specified in each module specification. For power budget purposes, multiply the total power requirement you calculated by 1.5 for maximum power needed.

Keywords/Phrases: 5B backpanel, power consumption, power requirement, total power, total power requirement

Dataforth modules are designed to be highly stable, thus they do not require re-calibration. DSCA modules can be re-calibrated in the field and they can be re-calibrated by Dataforth. To re-calibrate DSCA modules in the field, download AN801 from the Media Attachments box to the right of the topic main body and follow the instructions. We do offer a re-calibration service. For details, please contact sales by email at sales@dataforth.com or by phone at 1 800 444 7644 press 1 for sales.”

The major difference is the SCM5B41 is an input module and the SCM5B49 is an output module. This means that. The 5B41 module has its input on the isolated field side of the module connect to it through screw terminal blocks. The 5B41 module has its output on the system and power supply side of the module connect to it through ribbon cable connector (SCMPB01, SCMPB02, SCMPB05, and SCMPB06) or screw terminal blocks (SCMPB03, SCMPB04, and SCMPB07). The 5B49 module has its output on the isolated field side of the module connect to it through screw terminal blocks. The 5B49 module has its input on the system and power supply side of the module connect to it through ribbon cable connector (SCMPB01, SCMPB02, SCMPB05, and SCMPB06) or screw terminal blocks (SCMPB03, SCMPB04, and SCMPB07). Keywords/Phrases: 5B, 5B module, 5B input module, 5B output module, 5B41, 5B49.

Long story short, they believe the modules may be less accurate than specified. The biggest error seems to be a low voltage (1-2V), with error decreasing as Vin approaches 10V. The biggest error at low voltage with error decreasing as Vin approaches 10V means that they are calculating error as % of reading. Accuracy of Dataforth modules is specified and calculated as % of Span. The method is the following. Set the test voltage. Apply it to the module input. Measure the voltage at the module input. Calculate the expected module output voltage using the measured input voltage. Measure the output voltage. Calculate the % of Span error by the following formula. Accuracy error % Span = ((Measured Vout – Calculated Vout) / Output Span V ) x 100 This method works for input or output modules. Keywords/Phrases: Module accuracy, accuracy %, accuracy % of Span, Dataforth method for calculating Span accuracy