Denso GT10Q-SU User Manual page 23

(9) To make sure that the USB-COM device driver has been
successfully installed, open the Windows' Device Manager.
If DENSO WAVE USB-COM Port is added to the
sub-tree of Ports (COM & LPT) as shown at left, the
scanner is connected normally.
If the device is not added or it is marked with or ,
remove this driver with the uninstaller, reboot your
computer, and perform the above connection process again.
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