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Thread: looking for simple serial port tester

  1. #1
    Join Date
    Jun 2007
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    Ontario, Canada
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    Default looking for simple serial port tester

    Amazing what gets forgotten as well as lost in a move.. still searching for my brain!

    I need a quick and dirty way to test serial ports.

    I have 3 serial port expansion cards in my computer and I failed to mark which output is which port#


    Hopefully someone may have a circuit diagram I can use to create a dongle with resistor, led and db9 I can whip up and re-map all 24 ports.
    Cheers!
    Steve

    Learn 1 new thing everyday.

    "AURBO" -- Aurora Borealis

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  2. #2
    Join Date
    Dec 2008
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    Olathe, KS
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    Default Re: looking for simple serial port tester

    If you short pins 2 & 3 of the DB9 connector, it will "loop-back" the TX to RX. You can then use Putty (or any serial terminal program) - what you type will echo back to the terminal if you've shorted the open COM port.

    Edit: Disclaimer, these pin numbers are true for RS232.
    Last edited by mattrob; 11-28-2018 at 10:12 PM.

  3. #3
    Join Date
    Jun 2007
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    Default Re: looking for simple serial port tester

    thanks

    in the end I used a resistor with led off the data pin grounded to pin 5, worked well enough to identify/map my ports.
    Cheers!
    Steve

    Learn 1 new thing everyday.

    "AURBO" -- Aurora Borealis

    My weather today



    Chat link | Christmas Wiki link

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