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  • 9 to 25 Pin Serial Adapter Pinout


    This adapter will enable you to connect a 25 pin male serial cable to a 9 pin female serial connector on your computer.

    9 pin female connector

    9 pin D-Sub Female

    25 pin male connector

    25 pin D-Sub Male

    9-Pin to 25-Pin Adapter Pinout

    Signal 9-Pin 25-Pin
    Carrier Detect 1 8
    Receive Data 2 3
    Transmit Data 3 2
    Data Terminal Ready 4 20
    System Ground 5 7
    Data Set Ready 6 6
    Request to Send 7 4
    Clear to Send 8 5
    Ring Indicator 9 22

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

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