Shows pinout assignments for the 9-pin male DB-9 connector
Pin
|
Assignment
|
Description
|
|---|---|---|
1
|
DCD
|
Data carrier detect
|
2
|
RXD
|
Receive data
|
3
|
TXD
|
Transmit data
|
4
|
DTR
|
Data terminal ready
|
5
|
GND
|
Signal ground
|
6
|
DSR
|
Data set ready
|
7
|
RTS
|
Request to send
|
8
|
CTS
|
Clear to send
|
9
|
RI
|
Ring indicator
|
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