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XP woes

Discussion in 'Electronic Design' started by Dirk Bruere at Neopax, Sep 25, 2005.

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  1. Any way of reassigning COM port numbers?
    Specifically, I want to swap COM1 and COM5


    The Consensus:-
    The political party for the new millenium
  2. You must go to the com and lpt ports node, in the devices list (inside
    control panel -> system -> hardware), right click in properties, click in
    'port configuration' (I think it is called so in the english version of XP,
    because I have the spanish version), and then click in the 'Advanced
    Options' button. You will see a control to set the comm port number.

  3. Thanks.
    Tried it and the prog still crashes out.
    Probably have to get a cheap laptop with a genuine COM1


    The Consensus:-
    The political party for the new millenium
  4. Timber-man

    Timber-man Guest

    Dirk Bruere at Neopax пишет:
    You can edit some parameters in the registry



    (for w2k,xp)
  5. If you are using a USB to serial converter, then many programs will fail to
    work. The converter buffers serial data and feeds it through when polled by
    the USB, which messes up the timing of a lot of serial software. To make it
    worse, each converter has a different buffering strategy and the Windows
    drivers vary in quality.

    However, there is one brand of USB-Serial converter chip which is in stable
    supply and available in a number of brands of built up adapter. Just
    switching to this chip can fix a large percentage of problems.

    see for adapters, testimonials and links to FTDI

    We tailor our comms code to work on this adapter only and sell our customers
    the specific adaptor. Of course a hardware UART com port works great too,
    so not every customer has to buy the adapter.

    Roger Lascelles
  6. I forgot to mention : USB - Serial converters will fail if your computer is
    unwell or heavily loaded, because USB is polled. Depending on your setup,
    it might be asking too much to play a video, surf the net *and* use the
    USB-Serial converter all at the same time !

    Win2000 and WinXP are OK in our experience.

    The Win98, WinME family have such poor USB performance that we gave up using
    the converter. For example, hold down the mouse button and USB traffic
    stops !

    Roger Lascelles
  7. I'm using a PCMCIA device that supplies two ports at COM5 and COM6 and I'm not
    particularly inclined to keep buying bits of kit on the offchance that one of
    them will work. I've got a feeling that none of them will in the end and it's
    just more wasted money.

    Currently I've had to port the s/w to an ancient tower system with 2S+P where it
    works OK.


    The Consensus:-
    The political party for the new millenium
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