DB9 to DB25 Conversion Pinout

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Pinout and COM Port Summary Card

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EIA-232-E (RS-232)
Function

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PIN #
DB-25	DB-9

EIA-530
Function

PIN #
DB-25

TO
DTE

TO
DCE

Shield

1

Shield

1

Transmit Data (TD)

2

3

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Transmit Data	(A)
	(B)

2
14

>

Receive Data (RD)

3

2

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Receive Data	(A)
	(B)

3
16

<

Request To Send (RTS)

4

7

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Request To Send	(A)
	(B)

4
19

>

Clear To Send (CTS)

5

8

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Clear To Send	(A)
	(B)

5
13

<

DCE Ready (DSR)

6

6

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DCE Ready	(A)
	(B)

6
22

<

Signal Ground (SG)

7

5

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Signal Ground

(A)

7

Received Line Signal Detector (DCD)

8

1

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Received Line Signal Detector	(A)
	(B)

8
10

<

DTE Ready (DTR)

20

4

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DTE Ready	(A)
	(B)

20
23

>

Ring Indicator

22

9

N/A

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