Is it possible to use the S-Net MPI port as free RS 485 port?

Yes, it is possible to use the S-Net MPI port on the PCD3.M5xxx as free RS 485 port (S-Bus or Mode C per example).

Requirements
- Firmware Version $12 or higher is needed.
- The port has to be assigned as port 3

Wiring

DSub Pin        Signal
        1                 GND
        3               RxD/TxD-P
        8               RxD/TxD-N