Avalue EBM-A50M - Manual (Page 17)

Quick Installation Guide
EBM-A50M Quick Installation Guide 17
2.3.15 Serial port 1 connector (COM1)
In RS-232 Mode
Signal PIN PIN Signal
DCD1 1 2 RxD1
TxD1 3 4 DTR1
GND 5 6 DSR1
RTS1 7 8 CTS1
RI1 9 NC
In RS-422 Mode
Signal PIN PIN Signal
TxD1- 1 2 RxD1+
TxD1+ 3 4 RxD1-
GND 5 6 NC
NC 7 8 NC
NC 9 NC
In RS-485 Mode
Signal PIN PIN Signal
DATA1- 1 2 NC
DATA1+ 3 4 NC
GND 5 6 NC
NC 7 8 NC
NC 9 NC