Null Modem Adapter

A null modem adapter will enable you to use a normal serial cable as a null modem.

25 pin female connector

25 pin D-Sub Female

25 pin male connector

25 pin D-Sub Male

Null Modem Adapter Pinout

Signal 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

This data was contributed by the team at The Hardware Book.



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