25 way male
D-SUB 25 way male
25 way female
  • 25 pin D-SUB male at the DTE (Computer)
  • 25 pin D-SUB female at DCE (Modem)
  • Direction is DTE (Computer) relative DCE (Modem)
  • Do not connect SHIELD  (pin 1) to GND (pin 7)

Pin

Name

Description

Direction

1

GND

Shield ground

---

2

TXD

Transmit Data

-->

3

RXD

Receive Data

<--

4

RTS

Request to send

-->

5

CTS

Clear to send

<--

6

DSR

Data set ready

<--

7

GND

System ground

---

8

CD

Carrier detect

<--

9

Reserved

10

Reserved

11

STF

Select transmit channel

-->

12

S.CD

Secondary carrier detect

<--

13

S.CTS

Secondary clear to send

<--

14

S.TXD

Secondary transmit data

-->

15

TCK

Transmission signal element timing

<--

16

S.RXD

Secondary receive data

<--

17

RCK

Receiver signal element timing

<--

18

LL

Local loop control

-->

19

S.RTS

Secondary request to send

-->

20

DTR

Data terminal ready

-->

21

RL

Remote loop control

-->

22

RI

Ring indicator

<--

23

DSR

Data signal rate selector

-->

24

XCK

Transmit signal element timing

-->

25

TI

Test indicator

<--

9 way male
9 way female

Pin

Name

Description

Direction

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

<--

9 pin D-SUB female
9 pin D-SUB female
  •  DSR & CD are jumpered

Nullmodem cable (Female-Female)

Connector 1

Pin

Connector 2

Pin

Receive data

2

Transmit data

3

Transmit data

3

Receive data

2

Data terminal ready

4

Data set ready + Carrier detect

6+1

System ground

5

System ground

5

Data set ready + Carrier detect

6+1

Data terminal ready

4

Request to send

7

Clear to send

8

Clear to send

8

Request to send

7

9 pin D-SUB female
25 pin D-SUB female

Nullmodem cable (Female-Female)

Connector 1 (9w)

Pin

Connector 2 (25w)

Pin

Receive data

2

Transmit data

2

Transmit data

3

Receive data

3

Data terminal ready

4

Data set ready + Carrier detect

6 + 8

System ground

5

System ground

7

Data set ready + Carrier detect

6 + 1

Data terminal ready

20

Request to send

7

Clear to send

5

Clear to send

8

Request to send

4

25 pin D-SUB female
25 pin D-SUB female

Nullmodem cable (Female-Female)

Connector 1

Pin

Connector 2

Pin

Receive data

3

Transmit data

2

Transmit data

2

Receive data

3

Data terminal ready

20

Data set ready + Carrier detect

6+8

System ground

7

System ground

7

Data set ready + Carrier detect

6 + 8

Data terminal ready

20

Request to send

4

Clear to send

5

Clear to send

5

Request to send

4

9 pin D-SUB female
25 pin D-SUB male
D-SUB 25 way male

Modem cable (Female-Male)

Description

Connector 1 (9w)

Connector 2 (25w)

Direction

Transmit data

3

2

-->

Receive data

2

3

<--

Request to send

7

4

-->

Clear to send

8

5

<--

Data set ready

6

6

<--

System ground

5

7

---

Carrier detect

1

8

<--

Data terminal ready

4

20

-->

Ring indicator

9

22

<--

Name

Name

Name

Name

25 pin D-SUB female
25 pin D-SUB male
D-SUB 25 way male

Modem cable (Female-Male)

Description

Connector 1 (Female)

Connector 2 (Male)

Direction

Shield ground

1

1

---

Transmit data

2

2

-->

Receive data

3

3

<--

Request to send

4

4

-->

Clear to send

5

5

<--

Data set ready

6

6

<--

System ground

7

7

---

Carrier detect

8

8

<--

Data terminal ready

20

20

-->

Ring indicator

22

22

<--

9 pin D-SUB Female
25 pin D-SUB Male
D-SUB 25 way male

Two wire modem cable (Female-Male)

Description

Connector 1 (9w)

Connector 2 (25w)

Direction

Shield ground

1

---

Transmit data

3

2

-->

Receive data

2

3

<--

System ground

5

7

---

Request to send + Clear to send

7 - 8

Data set ready + Carrier detect + Data terminal ready

6 - 1 - 4

Request to send + Clear to send


4 - 5

Data set ready + Carrier detect + Data terminal ready

6 - 8 - 20

25 pin D-SUB Female
25 pin D-SUB Male
D-SUB 25 way male

Two wire modem cable (Female-Male)

Description

Connector 1 (Female)

Connector 2 (Male)

Direction

Shield ground

1

1

---

Transmit data

2

2

-->

Receive data

3

3

<--

System ground

7

7

---

Request to send + Clear to send

4 - 5

Data set ready + Carrier detect + Data terminal ready

6 - 8 - 20

Request to send + Clear to send

4 - 5

Data set ready + Carrier detect + Data terminal ready

6 - 8 - 20

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