The SCM9B-D192 RS-485 repeater reamplifies, or boosts, existing RS-485 signals transmitted over long distances. Repeaters are required to extend communications bus lengths or to allow more than 32 RS-485 devices to be connected to a communications bus.

The SCM9B-D192 operates on +5VDC power supply input voltage.
  • Completely Transparent to Host Software
  • No External Flow Control Signals Required
  • Optically-Isolated Bidirectional Data Flow
  • Standard Baud Rates: 300 to 115K Baud
  • Automatic Internal RS-485 Bus Supervision
  • Networking up to 4,000 Feet
  • Transient Suppression on RS-485 Data Lines
  • Internal Jumper Selectable Termination Resistors
  • CE Compliant
DIN Rail Mount RS-485 Repeater

SCM9B-D192 Devices


Part Number Description
DIN Rail Mount RS-485 Repeater

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.

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 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 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.
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Dataforth offers a wide range of custom modules for those instances when our standard commercial off-the-shelf (COTS) solutions don't quite meet your specific application needs. Contact Customer Service and Application Support to discuss design guidelines and design feasibility. Customer Service and Application Support can be reached at sales@dataforth.com or +1-800-444-7644.