Mitsubishi GOT1000 Series Connection Manual page 514

3 Precautions when preparing a cable
The length of the RS-422 cable must be 200m or less.
4 Connecting terminating resistors
When connecting an intelligent serial port module to a GOT, a terminating resistor has to be connected
to the intelligent serial port module.
The terminating resistor is unnecessary on the GOT side because one is built in the GOT.
13 - 10
13.2 Connection Cable
13.2.2 RS-422 cable
User's Manual for the HITACHI PLC