
Specifications
35
Specifications of Serial Interface COM1
Introduction
NOTE: For instructions on how to connect to other devices, always refer to the “GP-
Pro EX Device/PLC Connection Manual”.
DANGER
ELECTRIC SHOCK
The serial port is not isolated. The SG (signal ground) and the FG (frame ground)
terminals are connected inside the unit. When using the SG terminal to connect
an external device to the unit:
Verify that a short-circuit loop is not created when you set up the system.
Connect the #5 SG terminal to remote equipment when the host (PLC) unit is
not isolated. Connect the #5 SG terminal to a known reliable ground connection
to reduce the risk of damaging the RS232C/RS422/RS485 circuit.
Failure to follow these instructions will result in death or serious injury.
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