Avalue EBM-A50M - Manual (Page 19)

Quick Installation Guide
EBM-A50M Quick Installation Guide 19
2.3.18 Serial port 2 connector (JCOM2)
In RS-232 Mode
Signal PIN PIN Signal
DCD2 1 2 RxD2
TxD2 3 4 DTR2
GND 5 6 DSR2
RTS2 7 8 CTS2
RI2 9 10 NC
In RS-422 Mode
Signal PIN PIN Signal
TxD2- 1 2 RxD2+
TxD2+ 3 4 RxD2-
GND 5 6 NC
NC 7 8 NC
NC 9 10 NC
In RS-485 Mode
Signal PIN PIN Signal
DATA2- 1 2 NC
DATA2+ 3 4 NC
GND 5 6 NC
NC 7 8 NC
NC 9 10 NC