Chapter 2 Hardware Configuration
PPC-7508F USER’S MANUAL Page: 2-19
2-16. COM PORT CONNECTOR
There are four COM ports enhanced in this board namely: COM1,
COM2, COM3 and COM4. COM1, COM3 and COM4 are fixed for
RS-232, while COM2 is selectable for RS-232/422/485.
COM1 : COM1 Connector
The COM1 Connector assignments are as follows :
PIN ASSIGNMENT
1 DCD1
2 RX1
3 TX1
4 DTR1
5 GND
6 DSR1
7 RTS1
8 CTS1
9 RI1
COM2 : COM2 Connector
The COM2 Connector assignments are as follows :
PIN ASSIGNMENT
RS-232 RS-422 RS-485
1 DCD2 TX- TX-
2 RX2 TX+ TX+
3 TX2 RX+ RX+
4 DTR2 RX- RX-
5 GND GND GND
6 DSR2 RTS- NC
7 RTS2 RTS+ NC
8 CTS2 CTS+ NC
9 RI2 CTS- NC