The SCM9B-D100 Sensor to Computer Modules are a family of data acquisition modules that convert analog input signals to digital data and transmit via RS-485 to a controller which may be a computer or other processor-based equipment. The modules can measure temperature, pressure, voltage, current, digital input or digital output signals. The modules provide direct connection to a wide variety of sensors and perform all signal conditioning, scaling, linearization and conversion to either linearized ASCII data values or Modbus RTU data values.

Features such as address, data rate, parity, echo, etc., are selectable using simple commands over the RS-485 port. The selections are stored in nonvolatile EEPROM which maintains data even after power is removed.

Data is acquired on a per channel basis so you only buy as many channels as you need. The modules can be mixed and matched to fit your application. They can be placed remote from the host and from each other. You can string up to 247 modules on a twisted pair of wires by using RS-485 with repeaters.

All modules are supplied with screw terminal plug connectors. The connectors allow system expansion, reconfiguration or repair without disturbing field wiring.

Utility software is available from Dataforth to make the D100 easier to learn and use. The software is provided at no charge on request with a purchase order and is not copy protected.
  • Complete Sensor to RS-485 Interface
  • 500Vrms Analog Input Isolation
  • 15 Bit Measurement Resolution
  • Continuous Self-Calibration; No Adjustments of Any Kind
  • Programmable Digital Filter
  • Requires +5VDC Supply
  • Transient Suppression on RS-485 Communications Lines
  • Screw Terminal Plug Connectors Supplied
  • CE Compliant
DIN Rail Mount Sensor-to-Computer Modules

SCM9B-D11x Voltage Inputs


Part Number Input RangeOutput RangeBandwidthMechanical FormatIsolation Voltage
-10 to +10 mV RS-485 programmable DIN rail 500 Vrms
-100 to +100 mV RS-485 programmable DIN rail 500 Vrms
-1 to +1 V RS-485 programmable DIN rail 500 Vrms
-5 to +5 V RS-485 programmable DIN rail 500 Vrms
-10 to +10 V RS-485 programmable DIN rail 500 Vrms
-100 to +100 V RS-485 programmable DIN rail 500 Vrms

SCM9B-D125 Current Inputs


Part Number Input RangeOutput RangeMechanical FormatInternal Power SupplyIsolation VoltageIsolation TypeAccuracySupply Voltage
4 to 20 mA RS-485 DIN rail N/A 500 Vrms Transformer / Optical 2-way 0.04% of FS +5VDC ±5%

SCM9B-D13x Thermocouple Inputs


Part Number Thermocouple TypeOutput RangeInput Temperature RangeMechanical FormatIsolation VoltageIsolation TypeAccuracy
J RS-485 -200 to 760 °C DIN rail 500 Vrms Transformer / Optical 2-way ±1C Max
K RS-485 -150 to 1250 °C DIN rail 500 Vrms Transformer / Optical 2-way ±1C Max
T RS-485 -200 to 400 °C DIN rail 500 Vrms Transformer / Optical 2-way ±1C Max
E RS-485 -100 to 1000 °C DIN rail 500 Vrms Transformer / Optical 2-way ±1C Max
R RS-485 0 to 1750 °C DIN rail 500 Vrms Transformer / Optical 2-way ±2.5C Max
S RS-485 0 to 1750 °C DIN rail 500 Vrms Transformer / Optical 2-way ±2.5C Max
B RS-485 0 to 1820 °C DIN rail 500 Vrms Transformer / Optical 2-way ±2.5C Max
C RS-485 0 to 2315 °C DIN rail 500 Vrms Transformer / Optical 2-way ±2.5C Max

SCM9B-D14x Thermistor Inputs


Part Number TypeOutputInput Temp. RangeResolutionMechanical FormatIsolation VoltageIsolation TypeAccuracy
2252 Ohm at 25°C RS-485 0 to 100 (°C) 0.01°C or F DIN rail 500 Vrms Transformer / Optical 2-way ±0.1°C
TD Series RS-485 -40 to 150 (°C) 0.1°C or F DIN rail 500 Vrms Transformer / Optical 2-way ±0.2°C

SCM9B-D15x


Part Number Excitation VoltageSensitivityInput ConfigurationInput RangeOutput RangeBandwidthMechanical Format
5.0 V 0 to +30 mV RS-485
10.0 V 0 to +30 mV RS-485
5.0 V 0 to +100 mV RS-485
10.0 V 0 to +100 mV RS-485

SCM9B-D161 Timer/Frequency Inputs


Part Number Input RangeOutput RangeZero Crossing HysterisisMechanical FormatIsolation VoltageIsolation Type
1 to 20 kHz RS-485 adjustable 10mV - 1.0V DIN rail 500 Vrms Transformer / Optical 2-way

SCM9B-D17x Digital Input/Outputs


Part Number Description
6 Digital Inputs/RS-485 Output
6 Digital Outputs/RS-485 Output

Frequently Asked Questions


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

Analog Devices announced a last time buy and discontinuance of their signal conditioning modules. Can I replace them with Dataforth signal conditioning modules?
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.

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

If the input range of my signal conditioner is -1V to +1V and the output range is 0 to 10V, does this mean that it ignores polarity?
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.

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.