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9 way 'D' Serial Port Pin Out Table

This table presents an engineer's quick reference to the pin-out of a 9 way 'D' connector when used as a serial port.

D-Sub 9 Plug
Viewed looking in to pins of plug

 

Pin

Mnemonic

 Signal

Direction

1

DCD

 Received line signal detector, or Data Carrier Detected

DTE <= DCE

2

RD

 Receive Data

DTE <= DCE

3

TD

 Transmit Data

DTE => DCE

4

DTR

 Data Terminal Ready

DTE => DCE

5

Gnd

 Signal Ground

-

6

DSR

 Data Set Ready

DTE <= DCE

7

RTS

 Request To Send

DTE => DCE

8

CTS

 Clear To Send

DTE <= DCE

9

RI

 Ring Indicator

DTE <= DCE