DGH Corporation, D4252, D4200 Current Output Module, 0-20mA/RS-485
Features:
- 1000 conversions per second
- Readback of Analog Output Signal
- Communications Watchdog Timer
- User-programmable Starting Value
- User-scalable input data values
- Three digital inputs
- Programmable high/low output limits
- 500Vrms output isolation
- 12-bit output resolution
- Scaling in engineering units
- Baud rates 300 to 38,400
- Nonvolatile digital calibration
- Direct connection to "dumb" terminals or modems
- Requires +10 to +30Vdc unregulated supply
- Addressable: up to 124 units per serial port
- Bumpless manual control inputs
The D4200 series analog output modules contain an isolated 12-bit digital to analog converter that is scaled to generate current signals commonly used in the process control, production test and motion control industries.
The D4200 series modules include advanced features for improved system safety, including user-scalable input data values, a communications watchdog timer, user-programmable starting value, analog output slew-rate control and true analog output readback.
The communications watchdog timer, together with the user-programmable starting value, can be programmed to force the current output signal to a known "safe" condition in the event of a communications failure. Ensuring that control devices such as valves will not remain open if a communications cable is severed.
The D4200 contains an 8-bit analog to digital converter for true readback of the current output signal. While not a highly accurate measurement, the readback will provide assurance that the current output is working correctly. Use the readback to detect fault conditions, excessive load conditions, and wiring errors.
Three onboard digital inputs accept direct contact closures from switches or relays. Making them ideal for monitoring on/off signals like cabinet door status or manually controlling the analog output at a remote module location.
The D4200 series modules can also be mounted on a DIN-Rail using the MK-1 mounting kit.
For more information, please see 
Data Sheet
