Wiring Devices with Modbus Output
Use terminals 1 ... 4 for supply power and Modbus output. In addition to RS-485 data wires, the
common wire (ground reference) must be connected between the RS-485 host and the
HMDW110 transmitter.
RS-485 host
RS-485 +
RS-485 -
RS-485 common
10 ... 28 VDC
Figure 9 HMDW110 Wiring, Modbus Output
Do not connect the analog outputs (terminals 5 ... 8) at the same time when
supply power and/or Modbus output is connected to terminals 1 ... 4. Having both
terminals connected simultaneously may result in erroneous analog readings
caused by eects of possible ground loop.
16 M211692EN-C
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