USB Power lost.

[CNC]

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.

 

[M.I.5¾]

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.