2-20
SIMATIC PC RI25/45, Technical Description
C79000-G7076-C808-01
Figure 2-7 COM 2 serial interface
Pin
Abbreviations
Signal Designation
1
DCD
Data Carrier Detect
2
RxD
Receive Data
3
TxD
Transfer Data
4
DTR
Data Terminal Ready
5
Signal Ground
6
DSR
Data Set Ready
7
RTS
Request to Send
8
CTS
Clear to Send
9
Ri
Ring Indicator
COM2 Port
Signal Names
Motherboard