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/* Documentation
*/
Print version

RS232 connector
25 pin D-SUB MALE
25 pin D-SUB MALE connector  at the DTE (Computer)
25 pin D-SUB FEMALE
25 pin D-SUB FEMALE connector at the DCE (Modem)
Pin Name ITU-T Dir Description
1 GND 101 --- Shield Ground
2 TXD 103 -- > Transmit Data
3 RXD 104  <-- Receive Data
4 RTS 105 -- > Request to Send
5 CTS 106  <-- Clear to Send
6 DSR 107  <-- Data Set Ready
7 GND 102 --- System Ground
8 CD 109  <-- Carrier Detect
9 -   - RESERVED
10 -   - RESERVED
11 STF 126 -- > Select Transmit Channel
12 S.CD ?  <-- Secondary Carrier Detect
13 S.CTS ?  <-- Secondary Clear to Send
14 S.TXD ? -- > Secondary Transmit Data
15 TCK 114  <-- Transmission Signal Element Timing
16 S.RXD ?  <-- Secondary Receive Data
17 RCK 115  <-- Receiver Signal Element Timing
18 LL 141 -- > Local Loop Control
19 S.RTS ? -- > Secondary Request to Send
20 DTR 108 -- > Data Terminal Ready
21 RL 140 -- > Remote Loop Control
22 RI 125  <-- Ring Indicator
23 DSR 111 -- > Data Signal Rate Selector
24 XCK 113 -- > Transmit Signal Element Timing
25 TI 142  <-- Test Indicator

Note: Direction is DTE (Computer) relative DCE (Modem).
Note: Do not connect SHIELD(1) to GND(7).

RS-232D connector

RJ45 FEMALE
RJ45 FEMALE connector  at the devices
RJ45 MALE
RJ45 MALE connector at the cables
Pin Name Dir Description
1 DSR/RI  <-- Data Set Ready / Ring Indicator
2 CD  <-- Carrier Detect
3 DTR -- > Data Terminal Ready
4 GND --- System Ground
5 RXD  <-- Receive Data
6 TXD -- > Transmit Data
7 CTS  <-- Clear to Send
8 RTS -- > Request to Send

Note: Direction is DTE (Computer) relative DCE (Modem).

 

Serial (PC 25) connector

25 pin D-SUB MALE
25 pin D-SUB MALE connector  at the computer
Pin Name Dir Description
1 SHIELD - 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 n/c -  
10 n/c -  
11 n/c -  
12 n/c -  
13 n/c -  
14 n/c -  
15 n/c -  
16 n/c -  
17 n/c -  
18 n/c -  
19 n/c -  
20 DTR -- > Data Terminal Ready
21 n/c -  
22 RI  <-- Ring Indicator
23 n/c -  
24 n/c -  
25 n/c -  

Note: Direction is DTE (Computer) relative DCE (Modem).
Note: Do not connect SHIELD(1) to GND(7).

Serial (PC 9) connector

9 pin D-SUB MALE
9 pin D-SUB MALE connector  at the computer
Pin Name Dir Description
1 CD  <-- Carrier Detect
2 RXD  <-- Receive Data
3 TXD -- > Transmit Data
4 DTR -- > Data Terminal Ready
5 GND --- System Ground
6 DSR  <-- Data Set Ready
7 RTS -- > Request to Send
8 CTS  <-- Clear to Send
9 RI  <-- Ring Indicator

Note: Direction is DTE (Computer) relative DCE (Modem)

9 to 25 Serial Adapter

This adapter will enable you to connect a 25 pin serialcable to a 9 pin connector at the computer

9 pin D-SUB MALE
9 pin D-SUB MALE connector  at the computer
25 pin D-SUB FEMALE
25 pin D-SUB FEMALE connector to the cable
9-Pin 25-Pin
Carrier Detect 1 8
Receive Data 2 3
Transmit Data 3 2
Data Terminal Ready 4 20
System Ground 5 7
Data Set Ready 6 6
Request to Send 7 4
Clear to Send 8 5
Ring Indicator 9 22

Nullmodem Adapter

This adapter will enable you to use a normal serialcable as a nullmodem

25 pin D-SUB FEMALE
25 pin D-SUB FEMALE connector  at the Computer
25 pin D-SUB MALE
25 pin D-SUB MALE connector to the Serial cable
Female Male
Shield Ground 1 1 Shield Ground
Transmit Data 2 3 Receive Data
Receive Data 3 2 Transmit Data
Request to Send 4 5 Clear to Send
Clear to Send 5 4 Request to Send
Data Set Ready 6 20 Data Terminal Ready
Data Terminal Ready 20 6 Data Set Ready
Ground 7 7 Ground

Nullmodem (25-25) Cable

Use this cable between two DTE devices (for instance two computers)

25 pin D-SUB FEMALE
25 pin D-SUB FEMALE connector  at the Computer 1
25 pin D-SUB FEMALE
25 pin D-SUB FEMALE connector to the Computer 2
D-Sub 1 D-Sub 2
Receive Data 3 2 Transmit Data
Transmit Data 2 3 Receive Data
Data Terminal Ready 20 6+8 Data Set Ready + Carrier Detect
System Ground 7 7 System Ground
Data Set Ready + Carrier Detect 6+8 20 Data Terminal Ready
Request to Send 4 5 Clear to Send
Clear to Send 5 4 Request to Send

Note: DSR & CD are jumpered to fool the programs to think that they are online.

Nullmodem (9-25) Cable

Use this cable between two DTE devices (for instance two computers)

9 pin D-SUB FEMALE
9 pin D-SUB FEMALE connector  at the Computer 1
25 pin D-SUB FEMALE
25 pin D-SUB FEMALE connector to the Computer 2
D-Sub 9 D-Sub 25
Receive Data 2 2 Transmit Data
Transmit Data 3 3 Receive Data
Data Terminal Ready 4 6+8 Data Set Ready + Carrier Detect
System Ground 5 7 System Ground
Data Set Ready + Carrier Detect 6+1 20 Data Terminal Ready
Request to Send 7 5 Clear to Send
Clear to Send 8 4 Request to Send

Note: DSR & CD are jumpered to fool the programs to think that they are online

Nullmodem (9-9) Cable

Use this cable between two DTE devices (for instance two computers)

9 pin D-SUB FEMALE
9 pin D-SUB FEMALE connector  at the Computer 1
9 pin D-SUB FEMALE
9 pin D-SUB FEMALE connector to the Computer 2
D-Sub 1 D-Sub 2
Receive Data 2 3 Transmit Data
Transmit Data 3 2 Receive Data
Data Terminal Ready 4 6+1 Data Set Ready + Carrier Detect
System Ground 5 5 System Ground
Data Set Ready + Carrier Detect 6+1 4 Data Terminal Ready
Request to Send 7 8 Clear to Send
Clear to Send 8 7 Request to Send

Note: DSR & CD are jumpered to fool the programs to think that they are online

Modem (9-25) Cable

This cable should be used for DTE to DCE (for instance computer to modem) connections with hardware handshaking.

9 pin D-SUB FEMALE
9 pin D-SUB FEMALE connector  at the Computer
25 pin D-SUB MALE
25 pin D-SUB MALE connector to the modem
  Female Male Dir
Shield   1 ---
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  <--

At drawing up the information was used from http://wired.hard.ru


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