Com Port

I am trying ot use a data trasfer program that has always worked flawlessly,
but all of a sudden, it quit working and now says that my computer has no com
port. I have checked the devise manager and the device manager says that the
com port is functioning OK.

What could be the problem?

Big
Mon Mar 24 07:05:36 PDT 2008

John1791 wrote:
> I am trying ot use a data trasfer program that has always worked flawlessly,
> but all of a sudden, it quit working and now says that my computer has no com
> port. I have checked the devise manager and the device manager says that the
> com port is functioning OK.
>
> What could be the problem?
If you had something like a loopback plug you could use hyperterminal to
test it. You could still use hyperterminal to make a connection to the
com port and see if it works.
There are diagnostics in the device manager I think too that will test.
If you connected a modem you could try to talk to the modem.

But all these assume you have the hardware to test with.
You didn't upgrade your OS or anything did you?

smlunatick
Mon Mar 24 08:05:54 PDT 2008

On Mar 24, 8:43=A0am, John1791 <John1...@discussions.microsoft.com>
wrote:
> I am trying ot use a data trasfer program that has always worked flawlessl=
y,
> but all of a sudden, it quit working and now says that my computer has no =
com
> port. =A0I have checked the devise manager and the device manager says tha=
t the
> com port is functioning OK.
>
> What could be the problem?

Go into the Device Manager and check for the complete resource details
(IRQm IO address etc.) for the COM port. Serveral COM ports may not
use the standard IRQ settings (IRQ 4 for COM 1 and IRQ 3 for COM 2.)
Most every PCI based COM port do not!

M
Tue Mar 25 03:02:17 PDT 2008


"smlunatick" <yveslec@gmail.com> wrote in message
news:dccf0c94-ae01-4e2e-8082-cac6843112a2@a70g2000hsh.googlegroups.com...
On Mar 24, 8:43 am, John1791 <John1...@discussions.microsoft.com>
wrote:
> I am trying ot use a data trasfer program that has always worked
> flawlessly,
> but all of a sudden, it quit working and now says that my computer has no
> com
> port. I have checked the devise manager and the device manager says that
> the
> com port is functioning OK.
>
> What could be the problem?

Go into the Device Manager and check for the complete resource details
(IRQm IO address etc.) for the COM port. Serveral COM ports may not
use the standard IRQ settings (IRQ 4 for COM 1 and IRQ 3 for COM 2.)
Most every PCI based COM port do not!

-------------

Whilst true, the driver usually intercepts those IRQs and directs them where
they are required. They usually intercept the poprt calls as well.