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USB to Serial Converter

  1. Jul 22, 2012 #1
    I have a Prolific USB Serial Convertor which has been assigned COM 6. When connected to a device that allows 6 serial ports it works fine. I'm now trying to communicate with a device that only allows up to COM 4, how do I reassign the USB converter to COM 4 or less?
    I'm running WINDOWS XP 2002 on a DELL laptop.
  2. jcsd
  3. Jul 23, 2012 #2
  4. Jul 23, 2012 #3


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    If you're like me and you had COM ports being enumerated starting in the double digits, the following can be used to reset the enumeration (WARNING: requires registry modification):

    Or you can just manually do it, as per the post above me.
  5. Jul 24, 2012 #4
    Thanks guys I now have an additional problem, the ports 1 to 5 are all described as being used, how do I identify what is using the port so that I can decide which one to change?
  6. Jul 24, 2012 #5


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    If you open up the Device Manager (accessible through the Control Panel), expand the Ports section (click on the '+' sign), and then plug in your USB-serial converter, you should be able to see it get auto-detected (you may have to hit refresh).
  7. Jul 27, 2012 #6
    Have you upgrade windows xp to service pack 3 ?. It may be solve your problem.
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