Pinouts of Connectors

Nullmodem Adapter pinout

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

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

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25 pin D-SUB MALE connector pin-outs & layouts
25 pin D-SUB MALE connector  to the Serial cable
Pinouts.ru > Pinouts and schemes of serial ports cables >  Pinout of Nullmodem Adapter and layout of 25 pin D-SUB FEMALE connector and 25 pin D-SUB MALE connector

Source(s): Hardware Book
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