The SCM9B-1000/2000 Sensor-to-Computer Modules are a family of complete solutions designed for data acquisition systems based on personal computers and other processor-based equipment with standard serial I/O ports. The modules convert analog input signals to engineering units and transmit in ASCII format to any host with standard RS-485 or RS-232C ports. These modules can measure temperature, pressure, voltage, current and various types of digital signals. The modules provide direct connection to a wide variety of sensors and perform all signal conditioning, scaling, linearization and conversion to engineering units. Each module also provides digital I/O lines for controlling devices through solid state relays or TTL signals. These digital I/O lines along with built-in limit setting capability provide alarm and control outputs.



The modules contain no pots or switches to be set. Features such as address, data rate, parity, alarms, echo, etc. are selectable using simple commands over the communications port—without requiring access to the module. The selections are stored in nonvolatile EEPROM which maintains data even after power is removed.



The 2000 series is an enhanced version of the 1000 series of sensor interfaces. The 2000 series allows the user to scale the output data in any desired engineering units. The 2000 also provides the ability to program nonlinear transfer functions. This feature may be used to linearize nonstandard sensors or to provide outputs in engineering units which are nonlinear functions of the input.



Programmable Features (2000 Series)



  • Provides intelligent features not found in the 1000 series

  • ASCII Output Scaled to Desired Engineering Units

  • User Programmable Nonlinear Transfer Function

  • Straight-Line Segment Approximation: up to 24 Segments

  • Complete Sensor to RS-485 or RS-232C Interface
  • ASCII Format Command/Response Protocol
  • 500Vrms Analog Input Isolation
  • 15-Bit Measurement Resolution
  • Continuous Self-Calibration; No Adjustments of Any Kind
  • Programmable Digital Filter
  • Digital Limit Setting and Alarm Capability
  • Digital Inputs and Outputs Connect to Solid State Relays
  • Events Counter to 10 Million
  • Requires +10V to +30VDC Unregulated Supply
  • Transient Suppression on RS-485 Communications Lines
  • Screw Terminal Plug Connectors Supplied
  • CE Compliant
Sensor-to-Computer Modules

SCM9B-1100-2100 Voltage Inputs


Part Number Input RangeOutput RangeBandwidthMechanical FormatIsolation Voltage
-10 to +10 mV RS-232C programmable Plug-in or hockey puck 500 Vrms
-10 to +10 mV RS-485 programmable Plug-in or hockey puck 500 Vrms
-100 to +100 mV RS-232C programmable Plug-in or hockey puck 500 Vrms
-100 to +100 mV RS-485 programmable Plug-in or hockey puck 500 Vrms
-1 to +1 V RS-232C programmable Plug-in or hockey puck 500 Vrms
-1 to +1 V RS-485 programmable Plug-in or hockey puck 500 Vrms
-5 to +5 V RS-232C programmable Plug-in or hockey puck 500 Vrms
-5 to +5 V RS-485 programmable Plug-in or hockey puck 500 Vrms
-10 to +10 V RS-232C programmable Plug-in or hockey puck 500 Vrms
-10 to +10 V RS-485 programmable Plug-in or hockey puck 500 Vrms
-100 to +100 V RS-232C programmable Plug-in or hockey puck 500 Vrms
-100 to +100 V RS-485 programmable Plug-in or hockey puck 500 Vrms
-10 to +10 mV RS-232C programmable Plug-in or hockey puck 500 Vrms
-10 to +10 mV RS-485 programmable Plug-in or hockey puck 500 Vrms
-100 to +100 mV RS-232C programmable Plug-in or hockey puck 500 Vrms
-100 to +100 mV RS-485 programmable Plug-in or hockey puck 500 Vrms
-1 to +1 V RS-232C programmable Plug-in or hockey puck 500 Vrms
-1 to +1 V RS-485 programmable Plug-in or hockey puck 500 Vrms
-5 to +5 V RS-232C programmable Plug-in or hockey puck 500 Vrms
-5 to +5 V RS-485 programmable Plug-in or hockey puck 500 Vrms
-10 to +10 V RS-232C programmable Plug-in or hockey puck 500 Vrms
-10 to +10 V RS-485 programmable Plug-in or hockey puck 500 Vrms
-100 to +100 V RS-232C programmable Plug-in or hockey puck 500 Vrms
-100 to +100 V RS-485 programmable Plug-in or hockey puck 500 Vrms

SCM9B-1200-2200 Current Inputs


Part Number Input RangeOutput RangeMechanical FormatInternal Power SupplyIsolation VoltageIsolation TypeAccuracySupply Voltage
-10 to +10 mA RS-232C Plug-in or hockey puck None 500 Vrms Transformer / Optical 2-way ±0.02% of FS max 10 to 30 VDC
-10 to +10 mA RS-485 Plug-in or hockey puck None 500 Vrms Transformer / Optical 2-way ±0.02% of FS max 10 to 30 VDC
-1 to +1 mA RS-232C Plug-in or hockey puck None 500 Vrms Transformer / Optical 2-way ±0.02% of FS max 10 to 30 VDC
-1 to +1 mA RS-485 Plug-in or hockey puck None 500 Vrms Transformer / Optical 2-way ±0.02% of FS max 10 to 30 VDC
-100 to +100 mA RS-232C Plug-in or hockey puck None 500 Vrms Transformer / Optical 2-way ±0.02% of FS max 10 to 30 VDC
-100 to +100 mA RS-485 Plug-in or hockey puck None 500 Vrms Transformer / Optical 2-way ±0.02% of FS max 10 to 30 VDC
-1 to +1 A RS-232C Plug-in or hockey puck None 500 Vrms Transformer / Optical 2-way ±0.02% of FS max 10 to 30 VDC
-1 to +1 A RS-485 Plug-in or hockey puck None 500 Vrms Transformer / Optical 2-way ±0.02% of FS max 10 to 30 VDC
4 to 20 mA RS-232C Plug-in or hockey puck None 500 Vrms Transformer / Optical 2-way ±0.04% of FS max 10 to 30 VDC
4 to 20 mA RS-485 Plug-in or hockey puck None 500 Vrms Transformer / Optical 2-way ±0.04% of FS max 10 to 30 VDC
-10 to +10 mA RS-232C Plug-in or hockey puck None 500 Vrms Transformer / Optical 2-way ±0.02% of FS max 10 to 30 VDC
-10 to +10 mA RS-485 Plug-in or hockey puck None 500 Vrms Transformer / Optical 2-way ±0.02% of FS max 10 to 30 VDC
-1 to +1 mA RS-232C Plug-in or hockey puck None 500 Vrms Transformer / Optical 2-way ±0.02% of FS max 10 to 30 VDC
-1 to +1 mA RS-485 Plug-in or hockey puck None 500 Vrms Transformer / Optical 2-way ±0.02% of FS max 10 to 30 VDC
-100 to +100 mA RS-232C Plug-in or hockey puck None 500 Vrms Transformer / Optical 2-way ±0.02% of FS max 10 to 30 VDC
-100 to +100 mA RS-485 Plug-in or hockey puck None 500 Vrms Transformer / Optical 2-way ±0.02% of FS max 10 to 30 VDC
-1 to +1 A RS-232C Plug-in or hockey puck None 500 Vrms Transformer / Optical 2-way ±0.02% of FS max 10 to 30 VDC
-1 to +1 A RS-485 Plug-in or hockey puck None 500 Vrms Transformer / Optical 2-way ±0.02% of FS max 10 to 30 VDC
4 to 20 mA RS-232C Plug-in or hockey puck None 500 Vrms Transformer / Optical 2-way ±0.04% of FS max 10 to 30 VDC
4 to 20 mA RS-485 Plug-in or hockey puck None 500 Vrms Transformer / Optical 2-way ±0.04% of FS max 10 to 30 VDC

SCM9B-1300 Thermocouple Inputs


Part Number Thermocouple TypeOutput RangeInput Temperature RangeMechanical FormatIsolation VoltageIsolation TypeAccuracy
J RS-232C -200 to 760 °C Plug-in or hockey puck 500 Vrms Transformer / Optical 2-way ±1.0°C max
J RS-485 -200 to 760 °C Plug-in or hockey puck 500 Vrms Transformer / Optical 2-way ±1.0°C max
K RS-232C -150 to 1250 °C Plug-in or hockey puck 500 Vrms Transformer / Optical 2-way ±1.0°C max
K RS-485 -150 to 1250 °C Plug-in or hockey puck 500 Vrms Transformer / Optical 2-way ±1.0°C max
T RS-232C -200 to 400 °C Plug-in or hockey puck 500 Vrms Transformer / Optical 2-way ±1.0°C max
T RS-485 -200 to 400 °C Plug-in or hockey puck 500 Vrms Transformer / Optical 2-way ±1.0°C max
E RS-232C -100 to 1000 °C Plug-in or hockey puck 500 Vrms Transformer / Optical 2-way ±1.0°C max
E RS-485 -100 to 1000 °C Plug-in or hockey puck 500 Vrms Transformer / Optical 2-way ±1.0°C max
R RS-232C 0 to 1750 °C Plug-in or hockey puck 500 Vrms Transformer / Optical 2-way ±2.5°C max
R RS-485 0 to 1750 °C Plug-in or hockey puck 500 Vrms Transformer / Optical 2-way ±2.5°C max
S RS-232C 0 to 1750 °C Plug-in or hockey puck 500 Vrms Transformer / Optical 2-way ±2.5°C max
S RS-485 0 to 1750 °C Plug-in or hockey puck 500 Vrms Transformer / Optical 2-way ±2.5°C max
B RS-232C 0 to 1820 °C Plug-in or hockey puck 500 Vrms Transformer / Optical 2-way ±2.5°C max
B RS-485 0 to 1820 °C Plug-in or hockey puck 500 Vrms Transformer / Optical 2-way ±2.5°C max
C RS-232C 0 to 2315 °C Plug-in or hockey puck 500 Vrms Transformer / Optical 2-way ±2.5°C max
C RS-485 0 to 2315 °C Plug-in or hockey puck 500 Vrms Transformer / Optical 2-way ±2.5°C max

SCM9B-1400 RTD Inputs


Part Number Input ConfigurationRTD TypeInput RangeOutput RangeMechanical Format
2 & 3 Wire, 4 Wire 100 Ohm @ 0°C alpha = .00385 -200 to 850 (°C) RS-232C Plug-in or hockey puck
2 & 3 Wire, 4 Wire 100 Ohm @ 0°C alpha = .00385 -200 to 850 (°C) RS-485 Plug-in or hockey puck
2 & 3 Wire, 4 Wire 100 Ohm @ 0°C alpha = .00392 -200 to 600 (°C) RS-232C Plug-in or hockey puck
2 & 3 Wire, 4 Wire 100 Ohm @ 0°C alpha = .00392 -200 to 600 (°C) RS-485 Plug-in or hockey puck
2 & 3 Wire, 4 Wire 100 Ohm @ 25°C alpha = .00388 -100 to 125 (°C) RS-232C Plug-in or hockey puck
2 & 3 Wire, 4 Wire 100 Ohm @ 25°C alpha = .00388 -100 to 125 (°C) RS-485 Plug-in or hockey puck

SCM9B-1400-Thermistor Inputs


Part Number TypeOutputInput Temp. RangeResolutionMechanical FormatIsolation VoltageIsolation TypeAccuracy
2252 Ohm at 25°C RS-232C 0 to 100 (°C) 0.01°C or F Plug-in or hockey puck 500 Vrms Transformer / Optical 2-way ±0.1°C
2252 Ohm at 25°C RS-485 0 to 100 (°C) 0.01°C or F Plug-in or hockey puck 500 Vrms Transformer / Optical 2-way ±0.1°C
TD Series RS-232C -40 to 150 (°C) 0.1°C or F Plug-in or hockey puck 500 Vrms Transformer / Optical 2-way ±0.2°C
TD Series RS-485 -40 to 150 (°C) 0.1°C or F Plug-in or hockey puck 500 Vrms Transformer / Optical 2-way ±0.2°C

SCM9B-1500-2500 Strain Gage Inputs


Part Number Excitation VoltageSensitivityInput ConfigurationInput RangeOutput RangeBandwidthMechanical Format
5.0 V 3 mV/V to 600 mV/V Full Bridge -30 to +30 mV RS-232C programmable Plug-in or hockey puck
5.0 V 3 mV/V to 600 mV/V Full Bridge -30 to +30 mV RS-485 programmable Plug-in or hockey puck
10.0 V 3 mV/V to 600 mV/V Full Bridge -30 to +30 mV RS-232C programmable Plug-in or hockey puck
10.0 V 3 mV/V to 600 mV/V Full Bridge -30 to +30 mV RS-485 programmable Plug-in or hockey puck
5.0 V 3 mV/V to 600 mV/V Full Bridge -100 to +100 mV RS-232C programmable Plug-in or hockey puck
5.0 V 3 mV/V to 600 mV/V Full Bridge -100 to +100 mV RS-485 programmable Plug-in or hockey puck
10.0 V 3 mV/V to 600 mV/V Full Bridge -100 to +100 mV RS-232C programmable Plug-in or hockey puck
10.0 V 3 mV/V to 600 mV/V Full Bridge -100 to +100 mV RS-485 programmable Plug-in or hockey puck
8.0 V 3 mV/V to 600 mV/V Full Bridge +1 to +6 V RS-232C programmable Plug-in or hockey puck
8.0 V 3 mV/V to 600 mV/V Full Bridge +1 to +6 V RS-485 programmable Plug-in or hockey puck
10.0 V 3 mV/V to 600 mV/V Full Bridge +1 to +6 V RS-232C programmable Plug-in or hockey puck
10.0 V 3 mV/V to 600 mV/V Full Bridge +1 to +6 V RS-485 programmable Plug-in or hockey puck
5.0 V 3 mV/V to 600 mV/V Full Bridge -30 to +30 mV RS-232C programmable Plug-in or hockey puck
5.0 V 3 mV/V to 600 mV/V Full Bridge -30 to +30 mV RS-485 programmable Plug-in or hockey puck
10.0 V 3 mV/V to 600 mV/V Full Bridge -30 to +30 mV RS-232C programmable Plug-in or hockey puck
10.0 V 3 mV/V to 600 mV/V Full Bridge -30 to +30 mV RS-485 programmable Plug-in or hockey puck
5.0 V 3 mV/V to 600 mV/V Full Bridge -100 to +100 mV RS-232C programmable Plug-in or hockey puck
5.0 V 3 mV/V to 600 mV/V Full Bridge -100 to +100 mV RS-485 programmable Plug-in or hockey puck
10.0 V 3 mV/V to 600 mV/V Full Bridge -100 to +100 mV RS-232C programmable Plug-in or hockey puck
10.0 V 3 mV/V to 600 mV/V Full Bridge -100 to +100 mV RS-485 programmable Plug-in or hockey puck
8.0 V 3 mV/V to 600 mV/V Full Bridge +1 to +6 V RS-232C programmable Plug-in or hockey puck
8.0 V 3 mV/V to 600 mV/V Full Bridge +1 to +6 V RS-485 programmable Plug-in or hockey puck
10.0 V 3 mV/V to 600 mV/V Full Bridge +1 to +6 V RS-232C programmable Plug-in or hockey puck
10.0 V 3 mV/V to 600 mV/V Full Bridge +1 to +6 V RS-485 programmable Plug-in or hockey puck

SCM9B-1600-2600 Time/Frequency Inputs


Part Number Input RangeOutput RangeZero Crossing HysterisisMechanical FormatIsolation VoltageIsolation Type
0 to 60 Hz RS-232C Adjustable 10mV - 1V Plug-in or hockey puck 500 Vrms Transformer / Optical 2-way
0 to 60 Hz RS-485 Adjustable 10mV - 1V Plug-in or hockey puck 500 Vrms Transformer / Optical 2-way
100 µs to 30 s RS-232C Adjustable 10mV - 1V Plug-in or hockey puck 500 Vrms Transformer / Optical 2-way
100 µs to 30 s RS-485 Adjustable 10mV - 1V Plug-in or hockey puck 500 Vrms Transformer / Optical 2-way
0 to 60 Hz RS-232C Adjustable 10mV - 1V Plug-in or hockey puck 500 Vrms Transformer / Optical 2-way
0 to 60 Hz RS-485 Adjustable 10mV - 1V Plug-in or hockey puck 500 Vrms Transformer / Optical 2-way
1 to 10 kHz RS-232C Adjustable 10mV - 1V Plug-in or hockey puck 500 Vrms Transformer / Optical 2-way
1 to 10 kHz RS-485 Adjustable 10mV - 1V Plug-in or hockey puck 500 Vrms Transformer / Optical 2-way
100 µs to 30 s RS-232C Adjustable 10mV - 1V Plug-in or hockey puck 500 Vrms Transformer / Optical 2-way
100 µs to 30 s RS-485 Adjustable 10mV - 1V Plug-in or hockey puck 500 Vrms Transformer / Optical 2-way
0 to 60 Hz RS-232C Adjustable 10mV - 1V Plug-in or hockey puck 500 Vrms Transformer / Optical 2-way
0 to 60 Hz RS-485 Adjustable 10mV - 1V Plug-in or hockey puck 500 Vrms Transformer / Optical 2-way
100 µs to 30 s RS-232C Adjustable 10mV - 1V Plug-in or hockey puck 500 Vrms Transformer / Optical 2-way
100 µs to 30 s RS-485 Adjustable 10mV - 1V Plug-in or hockey puck 500 Vrms Transformer / Optical 2-way
1 to 10 kHz RS-232C Adjustable 10mV - 1V Plug-in or hockey puck 500 Vrms Transformer / Optical 2-way
1 to 10 kHz RS-485 Adjustable 10mV - 1V Plug-in or hockey puck 500 Vrms Transformer / Optical 2-way
100 µs to 30 s RS-232C Adjustable 10mV - 1V Plug-in or hockey puck 500 Vrms Transformer / Optical 2-way
100 µs to 30 s RS-485 Adjustable 10mV - 1V Plug-in or hockey puck 500 Vrms Transformer / Optical 2-way

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.

What is the difference between the SCM9B-1000 series and the SCM9B-2000 series?
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.