The D3000 andD4000 computer-to-analog output interfaces are designed to be mounted remotely from a host computer and communication with standard RS-232 and RS-485 serial ports. Simple ASCII commands are used to control a 12-bit digital-to-analog converter that is scaled to provide commonly used current and voltage ranges. An on-board microprocessor provides the communications interface and many intelligent analog output functions. These modules offer an extremely flexible, easy-to-use, and cost-effective approach to data acquisition. The D3000 and D4000 are compatible with the Omegabus Dl000 and D2000 and may be used in any combination. Up to 124 modules may be strung on one set of wires. All modules are supplied with screw terminal plug connectors and captive mounting hardware. The connectors allow system expansion, reconfiguration, or repair without disturbing field wiring. Their small size allows them to be mounted in virtually any location or position including explosion-proof housings and DIN rails. Although software is not required, utility software (S3000) is available upon request at no charge on an IBM-compatible disk.

 The D4000 modules offer several additional features. A slew rate may be programmed, which causes the output to ramp at an adjustable rate in either an increasing or decreasing direction. The ramp can be initiated and maintained by commands from the computer or with external switch closures to the module. The D4000 module provides a read back feature, which allows the computer to verify the integrity of the output. The D4000 modules also include a watchdog timer circuit that can be set such that if the computer fails to communicate with the module after a preset time period, the module reset itself to an adjustable default value. This feature minimizes the risks of communication failure.

• Single channel analog output:
  Voltage: 0-1V, + 1 V, 0-5 V, + 5 V, 0-10 V, + 10 V
  Current: 0-20 mA
• Input isolation to 500 V rms
• 12-bit measurement resolution
• Accuracy (integral and differential nonlinearly)
  0.1% FSR (max)
• Zero drift: +30 m V/░ C (voltage output)
  + 1.0 m A/⁰C (current output)
• 1000 conversions per second
• Settling time to 0.1% FS 300 m typical (1 ms max)
• Programmable output slew rate: 0.01 V/s (mA/s) to 10,000 V/s
  (mA/s) (D4000 only)
• Autozero and autocalibration-no adjustment pots
• Voltage compliance: + 12 V
• Output current, short circuit current: 5 mA min, 10 mA max.

 ANALOG OUTPUT READ BACK (D4000)

• RS-232, RS-485
• Up to 124 with Al000 repeater, 32 without repeater multidrop modules/host communications port
• User selectable channel address
• Selectable baud rates: 300, 600, 1200, 2400, 4800, 9600, 19,200, 38,400
• ASCII format command/response protocol
• Parity: odd, even, none
• All communications setups (address, baud rate parity) stored in nonvolatile memory using EEPROM
• Checksum can be added to any command or response
• Communications distance up to 10,000 feet with RS-485 modules

Power Requirements: Unregulated +10 V to +30 Vdc,
0.75 W max (voltage output), 1.0 W max (current output)
Case: ABS with captive mounting hardware
Connectors: screw terminal barrier plug (supplied)
Temperature Range: Operating: -25⁰C to +70⁰C;
Storage -25⁰C to +85⁰C
Relative Humidity: 0 to 95% non-condensing
  

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