Avalue LPC-1009 - Manual (Page 19)

Quick Reference Guide
LPC-1009/1209/1509/1709/1909 Series Quick Reference Guide 19
2.1.2 Serial port 2 connector (COM2)
RS-232
Signal PIN PIN Signal
DCD 1 6 DSR
RXD 2 7 RTS
TXD 3 8 CTS
DTR 4 9 RI
GND 5
RS-422
Signal PIN PIN Signal
TxD- 1 6 NC
RxD+ 2 7 NC
TxD+ 3 8 NC
RxD- 4 9 NC
GND 5
RS-485
Signal PIN PIN Signal
DATA- 1 6 NC
NC 2 7 NC
DATA+ 3 8 NC
NC 4 9 NC
GND 5