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Serial port under xp SP2 — Parallax Forums

Serial port under xp SP2

KiwiKiwi Posts: 85
edited 2005-04-16 17:37 in General Discussion
doesn't anybody have some problems with xp sp2 and their serial ports??

even with the ftdi usb-rs232 converters?

Kurt

Comments

  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2005-04-15 18:53
    Kiwi,

    ·· Most problems with serial ports are related to Laptops/Notebooks.· It's usually the FIFO Buffers or the Latency settings that cause the most problems.· Of course Palm Pilots (HotSync) programs also cause some trouble.

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    Chris Savage
    Parallax Tech Support
    csavage@parallax.com
  • KiwiKiwi Posts: 85
    edited 2005-04-15 19:13
    i am having a windows xp sp2 on my dell D610 laptop, and i have to run 3 serial communications programs.

    i have to run a program called dcm manager (www.qscaudio.com dcm3) that we use to program audio xovers. When i run that program on my laptop on com1 or usb-rs232 com 3 or with a pcmia serial card (2 serial ports com2 and com4) i always ,after it has downloaded the data to the xover , get an error 'error downloading data to dcm". that result in not saving data into the xover.

    I tried it on a laptop xp with no SP2, everything works fine.

    i can't find out where i have to remove the sp2 on xp.

    i asked the IT departement, they don't know what is wrong!!!???

    So any ideas what is going wrong or suggestions
  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2005-04-15 19:22
    Kiwi,

    ·· Did you even try what I mentioned above?· In your device manager, open the properties for the Serial ports, and make sure that the FIFO buffers are dsiabled and/or the Latency Timer is set to 1, instead of a higher number.· You shouldn't need to remove SP2 as that will open your computer to security problems.




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    Chris Savage
    Parallax Tech Support
    csavage@parallax.com
  • KiwiKiwi Posts: 85
    edited 2005-04-16 06:17
    i have tried everything from removing reinstalling serial drivers ,swtiching from IRQ ,switching from Com numbers, changed Fifi settings (all values tried). nothings work.
  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2005-04-16 17:37
    Kiwi said...
    i have tried everything from removing reinstalling serial drivers ,swtiching from IRQ ,switching from Com numbers, changed Fifi settings (all values tried). nothings work.
    Simply changing the FIFO buffer values may not be enough.· They should be disabled completely by unchecking the box, "Use FIFO Buffers."· You may also need to restart your computer for these settings to take effect.· Also, if you have a latency setting, was it lowered to 1 (Usually it's at 16 by default).

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    Chris Savage
    Parallax Tech Support
    csavage@parallax.com
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