Every time you unplug and re-plug a USB serial cable you cause the system
to create a new IRQ address for it, called COM5, 6,7,8,9 etc. If you do
the thing where you "remove usb devices safely" routine you can avoid this.
On Mon, Nov 19, 2018 at 12:13 PM geneb via cctalk <cctalk at classiccmp.org>
On Mon, 19 Nov 2018, Ethan via cctalk wrote:
> I have a question. I use the USB port for
serial. In my program, I use
> fixed com port. When going to the control
panel, I find that I see (in
> tags on some of the com ports. I'm the
only one currently using the com
> ports but recently another (in use) showed up, requiring me to modify
> program to use another com port. How does one
unuse a com port? how do
what is using it so I can stop it? I'm using windows 7
professional. Has anyone else had this problem? Dwight
Do you unplug the USB to Serial dongle with a terminal program open?
FYI, "In Use" doesn't mean the port is actively used by another
it means that the /name/ has been assigned and isn't available to assign
to a new COM device.
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