1. Short Pin No.1 and Pin No.6 (RDA–SDA) and Pin No.4 and Pin No.9 (RDB–SDB) on the COM1/COM2 connector using a clip or jumper wire. Then, access the [Control Panel] from the menu screen.
2. In the [Control Panel], select the [Serial] menu.
3. When the [Serial] window appears, select COM1 or COM2, set the signal level to RS-422, and run the port diagnosis.
4. The Serial Diagnotic window will pop up. If you see [COM2, RS-422: communication, OK], the port is functioning normally.
5. If you have properly shorted the pins but still see [COM2, RS-422: communication, Error], this indicates a potential hardware issue with the port. In this case, please contact our customer support center for service.

 

Note:
[Port Diagnosis] function is different from the [PLC Communication Diagnosis].
[Port diagnosis] is a loopback test that checks whether the hardware port itself is working properly.
To perform a communication test (Diagnostic) with the PLC, go to [Control Panel - PLC] in the menu.
For detailed information on cable wiring and communication settings with PLCs, please refer to the [Comm Manual].