Hi,
Because of the isolation mechanism, we will not see GPD on GND2 between one another, is this correct?
The main contribution of the common voltage is GPD. RS485 can operate within the common voltage between -7V and 12V.
Do we need to connect GND2 among devices? This means, for half-duplex applications, we need 3 wires for the differential pair and common ground.
Thanks.
Hector