PR-RS485
Actually, PR-RS485 is just a converter with photo isolation bringing out
3 wiring terminals(short circuited inner of such 3 terminals, so only one
channel RS485 bus is available) from RS485 port (2x8pin) of
CPU(PR-18/ELC-22/PR-24) for your easy connection with other devices.
If “ RT1 ” , RT2 ” terminal are short connected, one 120R resistor will
be connected between A/+ and B/-
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