User manual

31 Appendix A
A.3 Isolated RS-232/422/485 Ports
Pin Assignments
RS-232/422/485 Selection
COM3 and COM4 support 5-wire RS-232, RS-422 or RS-485 interfaces,
and you can set corresponding jumpers to select serial ports as RS-232 or
RS-422/485 interfaces shown in Table A-4.
The system detects RS-422 or RS-485 signals automatically in RS-422/
485 mode.
Table A.3: Isolated RS-232/422/485 Port Assigns
Pin 5-wire RS-232
Signal Name
RS-422
Signal
Name
RS-485 Signal Name
1 RxD TxD+ DATA+
2 TxD TxD- DATA-
3 RTS RxD+ NC
4 CTS RxD- NC
5 GND GND GND
Note: NC represents “No Connection.”
Table A.4: Jumpers to Select RS-232/422/485
Serial Port Corresponding jumper to select RS-232/422/485
COM3 JP4
COM4 JP5
COM3
1 2 3 4 5 1 2 3 4 5
COM4