Archived from groups: microsoft.public.windowsxp.hardware (
More info?)
I am not using API functions , I am using MSComm control in VB6.
NOTE: The protocol to talk serially to my external instrument is very simple
, I am sending a character and expect back another char.
It works fine when I try to communicate from XP hyperterminal.
Ted.
"Thomas Lutz" <tom@taltech.com> wrote in message
news:5qov901skuk12mf78dl7omlpgqcr0bmesv@4ax.com...
> If you are either using Windows API functions to communicate through
> the serial port or if you are using the MSComm ActiveX control that
> comes with Visual Basic 6, then your code should work just fine no
> matter what OS version you are using.
>
> What type of error are you seeing? Are you able to open the COM port
> but are not able to send or receive data or does your code fail when
> you try to open the port?
>
> If the code fails when you try to open the port, then it may be
> related to the following problem:
>
> If the device that you have connected to your serial port sends data
> continuously and you are running Windows NT/2K/XP, then the problem
> may be that Windows thinks that the device is a serial mouse and is
> installing the mouse driver for the COM port when you first boot up.
>
> The following URL contains more inforamtion on how to fix this type of
> problem.
>
http://www.taltech.com/support/troublsht/NTDetect.htm
>
>
> If you are able to open the port and cannot send or receive data then
> the problem may be hardware related. Check that the ribbon cable that
> goes from the motherboard to the COM port on the back of the PC is
> plugged in correctly. You might also try using the Hyperterminal
> program that comes with Windows to open the port to see if you can
> send and receive data from it. If you can communicate using
> Hyperterminal, then the problem is in your code - perhaps you have the
> wrong serial communications parameters.
>
> If you cannot send or receive data with Hyperterminal, then you most
> likely have some other hardware problem - a bad cable, etc.
>
>
>
> On Mon, 10 May 2004 08:14:21 -0700, "Titi Trandafir"
> <ttrandafir@juvent.com> wrote:
>
> > have a VB6 executable talking via serial port to an external instrument.
> >It works fine on a number of machines running ME and Windows95 on a old
> >IBM380D laptop , but fails on any newer IBM T40 running XP.
> >Any change to serial comm driver in XP?. How can I revert to a different
> >driver?
> >Ted.
> >
>
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