Avalue FPC-08W27 - Manual (Page 17)

Quick Reference Guide
FPC-08W2x Series Quick Reference Guide 17
2.2.2 External Serial Port 2 connector (COM2)
In RS-232 Mode
Signal PIN PIN Signal
DCD# 1 6 DSR#
RXDD# 2 7 RTS#
TXDD# 3 8 CTS#
DTR# 4 9 RI#
GND 5
In RS-422 Mode
Signal PIN PIN Signal
TxD1- 1 6 NC
RxD1- 2 7 NC
TxD1+ 3 8 NC
RxD1+ 4 9 NC
GND 5
In RS-485 Mode
Signal PIN PIN Signal
DATA1- 1 6 NC
NC 2 7 NC
DATA1+ 3 8 NC
NC 4 9 NC
GND 5