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Electronic Theatre Controls Inc

RS 232 Pinouts for DB25 and DB9 Connectors

Pins commonly used for RS-232 (serial):

DB-25

DB-9

Signal Direction

Signal Name

1

x

Protective

Ground

2

3

DTE-to-DCE

Transmitted Data

3

2

DCE-to-DTE

Received Data

4

7

DTE-to-DCE

Request To Send

5

8

DCE-to-DTE

Clear To Send

6

6

DCE-to-DTE

Data Set Ready

7

5

x

Signal Ground

8

1

DCE-to-DTE

Received Line Signal Detector (Carrier Detect)

20

4

DTE-to-DCE

Data Terminal Ready

22

9

DCE-to-DTE

Ring Indicator

Commonly used RS232 Null Modem Pin out for DB25 and DB 9 connectors:

Signal

Name

DB-25

DB-9

  DB-9 DB-25 Signal

FG

(Frame Ground)

1

-

<->

-

1

FG

TD

(Transmit Data)

2

3

2

3

RD

RD

(Receive Data)

3

2

3

2

TD

RTS

(Request To Send)

4

7

8

5

CTS

CTS

(Clear To Send)

5

8

7

4

RTS

SG

(Signal Ground)

7

5

5

7

SG

DSR

(Data Set Ready)

6

6

4

20

DTR

CD

(Carrier Detect)

8

1

4

20

DTR

DTR

(Data Terminal Ready)

20

4

1

8

CD

DTR

(Data Terminal Ready)

20

4

6

6

DSR

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