Denso QB30-SR User Manual page 21

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To use two or more USB ports
To use two or more USB ports, run the Setup.exe by the same number of times as the number of USB ports to be used.
Running the Setup.exe once adds one COM port.
Note: USB ports can be assigned to COM ports, one to one. It is not allowed to assign two or more USB ports to a single
COM port. To use two or more USB ports with a single USB device by turns, you need to run the Setup.exe by the same
number of times as the number of USB ports.
Connecting the USB device and installing the USB driver
[Windows XP]
(1) Connect the scanner's USB interface cable to the computer or USB hub.
(6) After completion of installation of the driver files, click Finish.
(2) Wait for the "Found New Hardware" to appear on the Windows task tray.
(3) Wait for Found New Hardware wizard to start, select "No, not this time," then
clock Next.
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