Pinouts of Connectors

Nullmodem (25-25) cable pinout

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

25 pin D-SUB FEMALE connector pin-out & layout
25 pin D-SUB FEMALE connector  to the Computer 1
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.

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25 pin D-SUB FEMALE connector pin-outs & layouts
25 pin D-SUB FEMALE connector  to the Computer 2
Pinouts.ru > Pinouts and schemes of serial ports cables >  Pinout of Nullmodem (25-25) cable and layout of 25 pin D-SUB FEMALE connector and 25 pin D-SUB FEMALE connector

Source(s): Hardware Book
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