MAQ20 data acquisition and control system The MAQ®20 Industrial Data Acquisition and Control System encompasses more than 25 years of design excellence and quality in the industrial test and measurement and control industry. This powerful, high performance, highly flexible system offers the industry's lowest cost per channel, integral PID loop control, and ±0.035% system accuracy (module dependent). It is ideal for test and measurement, factory and process automation, machine automation, military and aerospace, power and energy, environmental monitoring, and oil and gas applications.

The MAQ20 family consists of DIN rail mounted, programmable, multi-channel, industrially rugged signal conditioning input and output modules and communications modules (Figure 1). Each I/O module has a 1500Vrms isolation barrier between field-side and system-side wiring, and many models offer per-channel isolation. All field wiring terminals are heavily protected against overload, accidental connection of incorrect signals, and ESD. Modules mount on the industry standard 35x7.5mm gull-wing DIN rail. A backbone mounts within the rail providing power and communication interconnections between the communications modules and each I/O module.
  • Industry's Lowest Cost per Channel
  • ±0.035% Accuracy (Typical)
  • 1500Vrms Channel-to-Bus Isolation
  • Up to 240Vrms Continuous Field I/O Protection
  • ANSI/IEEE C37.90.1 Transient Protection
  • Direct Connection to Internet Option
  • Graphical Control Software
  • ReDAQ® Shape for MAQ®20 Software
  • IPEmotion Software
  • Advanced Features Including Integral PID Control, Alarms, Counters, Timers, PWMs, and more
  • Up to 32 PID Loops with ReDAQ® Shape Software
  • Unlimited PID Loops with IPEmotion Software
  • Wide Range 7-34VDC Input Power
  • –40°C to +85°C Industrial Operating Temperature
  • UL/CUL Listing Pending (Class I, Division 2, Groups A, B, C, D)
  • Heavy Industrial CE and ATEX Compliance Pending
  • Manufactured per RoHS Directive 2002/95/EC

System Builder

Use the System Builder to create your own MAQ®20 System.

Software Download Center

Use the MAQ20 Software and User Manuals download center.
Part Number Datasheet User Manual Description
 Order Info
Communication Modules: Provide Connection, Power, Interface
 Order Info
Analog Input Modules: Voltage & Current
 Order Info
Analog Input Modules: Process Voltage & Process Current
 Order Info
Analog Input Modules: Thermocouple
 Order Info
Analog Input Modules: RTD & Potentiometer
 Order Info
Analog Input Modules: Strain Gage
 Order Info
Analog Input Modules: Frequency
 Order Info
Analog Output Modules: Voltage & Current
 Order Info
Isolated Discrete Input & Output Channels
 Order Info
System Backbones: Distribute Power and Communications
 Order Info
High Density Discrete Voltage Input Modules
 Order Info
High Density Isolated Discrete Output Module
 Order Info
Discrete Output Module: Relay
 Order Info
Boost Power Supply Module
 Order Info
Data Acquisition Accessories

Software and User Manual Downloads

Use the MAQ20 Software and User Manuals download center to access all MAQ20 Software.
  • Purchase Software License
  • Download Free Trials
  • Download No-Charge Software
Download Center

Frequently Asked Questions


What are the Modbus mapping details to use for PID control features like set point address, tuning parameter details, alarms, etc.?
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.

Where do I download MAQ20 configuration software?
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.

Do I need a PC connected to Record to MAQ20 SD Card?
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.

Can Dataforth provide calibration reports for modules I purchased?
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

I cannot see the IP address in the Modbus registers in DHCP mode. Where do I find it?
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

Does MAQ20 have the capacity for OPC?
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

What are the MAQ20-COM2, -COM4 RS-232, RS-485 pinouts, respectively?
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.

What is the max sample rate for MAQ20 modules?
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.

I have three MAQ20 placed in three different buildings, is it possible to connect the device to the ADSL network?
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

Unhandled exception error in the installation process of ReDAQ Shape in Win XP
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.

Is MAQ20-940, ReDAQ Shape, an electronic download only or is it also on DVD, flash drive?
MAQ20-940, ReDAQ Shape, is an electronic only product for download from www.dataforth.com.

Keywords/Phrases: MAQ20–940, ReDAQ Shape

Why do Dataforth’s linearized thermocouple modules have a low bandwidth of 3-4 Hz?
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.

How do I find SLX940 ReDAQ Shape Software?
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

What file/formats are supported/produced with ReDAQ Shape?
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.

How do I save my module configuration in the Configuration Software Tool (MAQ20-945)?
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.

What does “sensitivity” mean on my strain gage input module?
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.

Where do I download the USB drivers for the MAQ20 to be used with ReDAQ Shape?
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

How do I convert an RMS voltage to its corresponding peak voltage?
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

How are unlock codes used with ReDAQ Shape?
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.

Does the MAQ20 support tachometer input?
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.

How do I register / unregister modules in a MAQ20 system?
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.

Is it possible to provide external power supply directly to the backplane rail instead through the MAQ20-COM2 front panel?
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.

Can MAQ20-BRDG1 support a strain sensor such as a load cell, can it measure stress?
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

How are unlock keys used to license IPEmotion?
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.

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

Is there any way to select or use a custom port or transmission method other than port 502 with the MAQ20-COMx?
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.

Does Dataforth have any options for thermistor input?
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.

Can ReDAQ Shape licenses be transferred between systems?
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.

How long is the delay between the MAQ20 COM module reading data and that data being transferred to the host PC?
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.

I tried to print a test data sheet for my MAQ20 module on your website but I couldn’t. Is there anything special I need to do to get a test data sheet for my MAQ20 module?
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

Is it possible to send a remote setpoint via Modbus/TCP to a PID loop running your ReDAQ Shape software on MAQ20 hardware?
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

Can I disconnect my MAQ20 from my PC and have the system to continue to log data?
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.)

Can I save the settings of my MAQ20 module to EEPROM outside of ReDAQ Shape?
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.

How does the load resistance of a module affect the noise at the output?
Noise at the output of a module is independent of load resistance.

Is there a demo version available for ReDAQ Shape?
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.

Does the MAQ20-COMx module run the ReDAQ Software or is it run externally on PC?
ReDAQ Shape is ran externally from the MAQ20 system on a host PC running Windows OS, not on the MAQ20-COMx module.

Can the MAQ20 save data directly to a SQL database?
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.

What wire gauge is accepted by the terminals on the MAQ20-xTC input module?
The MAQ20-xTC input modules accept stranded wire from AWG 24 to AWG 20 and solid wire from AWG 26 to AWG 20.

Can I copy and paste data from ReDAQ Shape while in acquisition?
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.

Does USB have a faster response time than Ethernet when communicating with the MAQ20?
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.

Does the MAQ20 Python API support USB connection?
Currently, the MAQ20 Python API only supports Ethernet connection.

Can I export data from ReDAQ shape to a text file or Excel spreadsheet?
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.

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

Can I still export my acquired data to a text file or Excel spreadsheet with the User version of ReDAQ Shape?
Yes, these options are available in both the User and Developer versions of ReDAQ Shape.

Will I run into any problems operating my MAQ20 system for 60 days straight?
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.

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