COM1/COM3
Pin1 Rx-(B) (COM1 RS485-2/4)
Pin2 RxD_PLC (COM1 RS232))
Pin3 TxD_PLC (COM1 RS232)
Pin4 Tx- (COM1 RS485-4)
Pin5 GND
Pin6 Rx+(A) (COM1 RS485-2/4)
Pin7 RxD_PC/PLC (COM3 RS232)
Pin8 TxD_PC/PLC (COM3 RS232)
Pin9 Tx+ (COM1 RS485-4)