what app using serial port?

January 11, 2006 at 03:30:42
Specs: Windows XP SP2, Pentium 4/480
An application i am writing tries to create a connection with the serial port. It seems as if some other application is using the serial port and i cannot open a connection. Is it possible to find out what is communicating through the serial port without going through every application one by one?

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January 11, 2006 at 04:45:18
Well there is not that many applications that would want to use the serial port. What devices, if any, do you have plugged into the serial port? I take it we are talking about RS232 serial port and not a USB port.

It would have to be some kind of communications application, like Internet Explore if you were on dial up. The Internet dialer closes the serial port when you log off. Or a serial mouse.

If you are getting unexpected use of the serial port I would check for the presence of a rouge dialler. Do you have a good Anti Virus installed?

Then there are some badly written applications that do not close the serial port when it has finished with it. Is it your own application that is keeping the serial port open?


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January 11, 2006 at 14:03:17
And windows will sometimes display that error message erroneously, when there is no one else using the port.

Make sure the port is enabled in the bios.

You could also try removing the port in the Device Manager. Reboot and windows should restore it.

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January 12, 2006 at 03:34:47
Thanks for the replies. Appreciate the help.

Found the offending piece of software (Microsoft ActiveSync). Don't know why or how this was affecting the com port. Any explanations appreciated.

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January 12, 2006 at 08:51:50
I have no idea. But thanks for the feedback.

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