Hello, I have a CNC control running XP Embedded. It communicates to the host
computer via USB to serial adapter. The communications work until the machine
runs a large program. After that the software give an error. "unable to open
port" I believe something is killing power to the USB. After rebooting the
system everything works fine. The system started doing this after software &
bios update. I would appreciate any ideas as to what the problem may be.

"CNC" <CNC@discussions.microsoft.com> wrote in message
news:22049103-7FDE-43D9-98B9-394EE3DC8144@microsoft.com...
> Hello, I have a CNC control running XP Embedded. It communicates to the
> host
> computer via USB to serial adapter. The communications work until the
> machine
> runs a large program. After that the software give an error. "unable to
> open
> port" I believe something is killing power to the USB. After rebooting
> the
> system everything works fine. The system started doing this after software
> &
> bios update. I would appreciate any ideas as to what the problem may be.

The BIOS or software update perchance? Go back to the original. Does the
fault dissappear? If so, the update is bad.