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24.3  Preparatory Procedures for Monitoring
24.3.5  Attaching communication unit and connecting cable
24.3.5 Attaching communication unit and connecting cable
Cautions when attaching the communication unit and connecting the cable
Shut off all phases of the GOT power supply before attaching the communication 
unit and connecting the cable.
1 Attaching the communication unit
Serial communication unit
For details on the  serial communication unit, refer to the following manual:
 GT15 Serial Communication Unit User's Manual 
GT15-RS2, GT15-RS4, GT15-RS4-TE
1 Attach the serial communication unit to the 
extension unit connector on the GOT.