DGH offers the D3000M digital-to-analogue modules
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DGH product story
Edited by the Engineeringtalk editorial team
Dec 1, 2008
DGH has introduced the D3000M Modbus-compatible smart digital-to-analogue modules, which simplify controlling an analogue output with a serial port.
The D3000M series combines a 12-bit DAC (digital-to-analogue converter) with programmable analogue output control features.
It communicates using Modbus RTU over an RS-232C or RS-485 link.
The series has 16 models: voltage (0-1V, +/- 1V, 0-5V, +/-5V, 0-10V, +/-10V DC) and current (0-20mA, 4-20mA) with either RS-232 or RS-485 input.
Output slopes are programmable from 0.01V/s (mA/s) to 10,000V/s (mA/s).
Input-to-output isolation is 500Vrms.
Output burnout protection is 240V AC (current outputs), +/-30V (voltage models).
Measurement resolution is 12 bits.
Update rate is 1000 conversions a second.
Accuracies are: 0.1 per cent FS voltage and current.
Each module also provides a manual up or down override of the analogue output.
These modules can be used in industrial applications such as continuous variable control valves and actuators, a 4-20mA loop interface, controllers, discrete (on/off) solenoids, valves, limit switch sensing and relays.
An 8-bit CMOS microcomputer performs all scaling and calibration tasks in software, eliminating the need for pots, switches or adjustment hardware.
Communication features include channel address, baud rate (300 to 115K), parity, line feed, byte time delays, and checksum.
A programmable watchdog timer provides orderly shutdown in the event of host failure.
The modules come in a 9.1 x 6.2 x 2.8cm ABS case with captive hardware and a plug-in screw terminal connector.
Each module requires 10 to 30V DC unregulated supply at 1.3W (max).
Rated performance is specified from 0 to 70C, but the modules operate from -25 to +85C.
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