Advantech SPC-57 - Manual (Page 45)

45
Pin
Signal
1
DCD
2 RXD
3 TXD
4 DTR
5 GND
6 DSR
7 RTS
8 CTS
9 RI
Figure 3.8 I/O Board COM1(RS-232) serial port
CN 4 : RS-485 serial port