A
How many wires do we need in RS485 half duplex communications?
1 cable for rx+
1 cable for tx+
Is it necessary to have a ground?
It is said that at least 3 wires are necessary but I can communicate with a pm800 with only 2 wires (rx+, tx+).
With 2 wire communications:
During transmit, does rx+ act as tx- and during receive does tx+ act as rx-?
And what if I use shield for ground and earth/ground both?
1 cable for rx+
1 cable for tx+
Is it necessary to have a ground?
It is said that at least 3 wires are necessary but I can communicate with a pm800 with only 2 wires (rx+, tx+).
With 2 wire communications:
During transmit, does rx+ act as tx- and during receive does tx+ act as rx-?
And what if I use shield for ground and earth/ground both?