Computer Monitor User Manual

Appendix A I/O Pin Assignments 45
A.7 COM2 Connector
Table A.7: COM2
Pin RS-232 RS-422 RS-485
1 DCD TX- DATA-
2RX TX+ DATA+
3 TX RX+ ---
4 DTR RX- ---
5 GND GND ---
6 DSR --- ---
7 RTS --- ---
8 CTS --- ---
9 RI --- ---