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Computer-to-Analog Output Modules

The SCM9B-4000 series are complete computer-to-analog output interfaces. They are designed to be mounted remotely from a host computer and communicate, in ASCII, with standard RS-232 and RS-485 serial ports. Simple ASCII commands are used to control a 12-bit DAC (Digital-to-Analog Converter) which is scaled to provide commonly used current and voltage ranges. An 8-bit CMOS microprocessor provides an intelligent interface be-tween the host and the DAC. The 4000 are compatible with the 1000/2000 input modules and may be mixed in any order.

The modules are easy to use. You do not need engineering experience in complicated data acquisition hardware. This modular approach to data acquisition is extremely flexible, easy to use and cost effective. The modules can be mixed and matched to fit the application. They can be placed remote from the host and from each other. You can string up to 124 modules on one set of wires.

Although software is not required, utility software (SCM9B-S1000) is available on IBM-compatible diskette to make the 4000 easier to learn and use. S1000 software is provided at no charge on request with a purchase order and is not copy protected.

Circuit diagram Dataforth SCM9B-4000

Block Diagram SCM9B-4000

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  • Backpanels and Accessories

  • 16 Modules for Type SCM9B-4000:

    SCM9B-4121 RS-232C
    SCM9B-4122 RS-485
    SCM9B-4132 RS-485
    SCM9B-4131 RS-232C
    SCM9B-4141 RS-232C
    SCM9B-4142 RS-485
    SCM9B-4161 RS-232C
    SCM9B-4162 RS-485
    SCM9B-4171 RS-232C
    SCM9B-4172 RS-485
    SCM9B-4181 RS-232C
    SCM9B-4182 RS-485
    SCM9B-4262 RS-485
    SCM9B-4261 RS-232C
    SCM9B-4251 RS-232C
    SCM9B-4252 RS-485


    • Analogue Output ranges: 0-1V, ±1V, 0-5V, ±5V, 0-10V,
    • Communication in ASCII with RS-232 or RS-485
    • Programmable High/Low Outputranges
    • Output isolation 500 Vrms
    • 12-Bit resolution
    • Scaling in physical units
    • Baud Rate 300 to 38.400 bps
    • Digitale calibration
    • Output protection 240VAC (Current output) ± 30V (Voltage output)
    • Direct Connection to 'Dumb' Terminal or Modem
    • Power Supply +10 V to +30 VDC
    • Up to 3500 m from Host (RS-485) possible
    • up to 124 modules addressable via serial port
    • Manuel Control
    • CE Compliant