
PC/104 Module PFM-HDS
Chapter 2 Quick Installation Guide 2-22
Pin Pin Name Signal Type Signal Level
1 DCD4 IN
2 DSR4 IN
3 RXD4 IN
4 RTS4 OUT ±9V
5 TXD4 OUT ±9V
6 CTS4 IN
7 DTR4 OUT ±9V
8 RI4 IN
9 GND GND
2.28 COM2 RS232/422/485 Connector (CN25)
RS-232
Pin Pin Name Signal Type Signal Level
1 DCD2 IN
2 DSR2 IN
3 RXD2 IN
4 RTS2 OUT ±9V
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