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Serial Port to Serial Port connections

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

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

DB9-1DB9-2
Receive Data23Transmit Data
Transmit Data32Receive Data
Data Terminal Ready46+1Data Set Ready + Carrier Detect
System Ground55System Ground
Data Set Ready + Carrier Detect6+14Data Terminal Ready
Request to Send78Clear to Send
Clear to Send87Request to Send
Note: DSR & CD are jumpered to show the rs232 software or rs232 devices that another side is online.

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

DB9DB25
Receive Data33Transmit Data
Transmit Data22Receive Data
Clear To Send + Data Set Ready8 + 620Data Terminal Ready
Carrier Detect + Data Terminal Ready1 + 4 
Ground57Ground
Our software allows you monitor, log, debug and test your RS232 or COM ports.

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.