Serial port to serial port. Cable wiring and pinout

Use this cable between two DTE devices (for instance two laptops).

RS232 port pinout (D-SUB female) on Side 1
RS232 port pinout on Side 1
RS232 port pinout (D-SUB female) on Side 2
RS232 port pinout on Side 2

DB9-1 DB9-2
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 show the rs232 software or rs232 devies that another side is online.

Use this cable between two devices: DTE and DCE (for example, a computer and a printer).

DB9 DB25
Receive Data
3
3
Transmit Data
Transmit Data
2
2
Receive Data
Clear To Send + Data Set Ready
8 + 6
20
Data Terminal Ready
Carrier Detect + Data Terminal Ready
1 + 4
 
Ground
5
7
Ground

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Serial port to another serial port related links

- If your devices have other connectors (for example, DB-25 pin) look here: RS-232 - RS-232 connection using DB25 connectors.
- RS232 port connector with all pins.