Avalue PPC-1527 - Manual (Page 11)

Quick Reference Guide
PPC-1525/1527 Series Quick Reference Guide 11
2.1.2 USB 2.0 connector/Serial Port connector (USB/COM2)
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 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 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 NC