DB9 RS232 pinout
Pin
Signal
In/Out
Description
1
DCD
In
Data Carrier Detect
2
RxD
In
Receive Data
3
TxD
Out
Transmit Data
4
DTR
Out
Data Terminal Ready
5
GND
-
Ground
6
DSR
In
Data Set Ready
7
RTS
Out
Request To Send
8
CTS
In
Clear To Send
9
RI
In
Ring Indicator
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