Motorola GT10 - Manual (Page 82)

GT10/GT30 4.9 Automatic Communication Settings Function
59
and the PLC will not be possible if the target usage of the RS232C
port has been set to “Computer Link”. Always set the setting on the
PLC side to match “Computer Link”. For detailed information,
please refer to Chapter 4, “Connecting and Communicating with the
PLC”, on page 41.