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Serial port connector
The two serial port connectors are identical and are 9-pin, D-SUB male connectors.
Pin
Signal
I/O
Description
1
CD
I
Carrier Detect
2
RXD
I
Receive Data
3
TXD
O
Transmit Data
4
DTR
O
Data Terminal Ready
5
GND
-
Ground
6
DSR
I
Data Set Ready
7
RTS
O
Request to Send
8
CTS
I
Clear to Send
9
RI
I
Ring Indicator
