The Shield and GND (ground) connections are internally connected in an ION meter using a diode bridge.


This is the best wiring solution for connecting a 3-Wire RS-485 device to an ION Meter (COM1 or COM2).

NOTE: The fourth wire (Shield) should still be present in the communication wire bundle, but left unconnected at the ION meter.

The Shield and GND (ground) connections are internally connected in an ION meter using a diode bridge.


This is the best wiring solution for connecting a 3-Wire RS-485 device to an ION Meter (COM1 or COM2).

NOTE: The fourth wire (Shield) should still be present in the communication wire bundle, but left unconnected at the ION meter.