John,

Do you have a modem installed?  If so, that may be the culprit using
that port.
Have you tried switching to a different port?

	
Regards,

	
Jim 

-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf
Of John Pfaff
Sent: Thursday, January 18, 2007 8:36 AM
To: piclist@mit.edu
Subject: [EE] PC Serial Port

I've looked all over, and can't find the answer on my own, so I'm asking
the smartest bunch of people I know.
I'm using Windows XP, and can't use one of the serial ports.  I'm trying
to install a drawing tablet that uses the serial port, but now matter
what I try (Hyper Terminal, Tera Term, PortMon, other programs that use
the serial port), nothing can use it.  The error message I get says that
something else is using the telephony device.  Is there any way I can
tell what process is using the serial port?  I've tried Googling.  About
the closest thing I've found is a Microsoft utility called PortMon, but
even that can't attach to the serial port and won't/can't tell me what
is using it.
I don't know if the serial port has ever worked properly on this PC.
I've checked BIOS settings for the port.  Is there any possibility that
Norton Internet Security is doing something?

Thanks,
John Pfaff
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