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Pinouts

The figure below illustrates the DB-9 Serial connector.  

Serial connector

The table below lists Serial connector pinouts.  

Serial Connector Pinouts

1

CD

Carrier Detect

2

TXD

Transmitted Data

3

RXD

Received Data

4

DSR

Data Set Ready

5

GND

Signal Ground

6

DTR

Data Terminal Ready

7

CTS

Clear To Send

8

RTS

Request To Send

9

RI

Unused

5

1

9

6