Omron GRT1-ML2 Hardware Reference Manual page 68

Hardware reference
WIRE 2/4 Switch
The WIRE 2/4 switch sets the communication standard for the RS422/485
serial connection. To use one of the communication standards, do this:
/i
Communication standard How to select it
RS422 Set the WIRE 2/4 switch right
RS485 Set the WIRE 2/4 switch left
Note
In RS485 mode, the transmit pair is connected to the receive pair.
HARDWARE REFERENCE MANUAL
fig. 23
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