How to change the USB port number in Windows XP.

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1 To change the Port Number of the USB COM Port open Devive Manager by clicking
Start -> Control Panel -> System (or hold down the "Windows" key and press "Pause-Break"
select the Hardware Tab and click the Device Manager button.
Click Start -> Run...
and enter devmgmt.msc
2 The USB Serial Port (COMX) is in the Ports section

To change the Port number right-click the USB Serial Device and select Properies
3 Select the "Port Settings" Tab and click "Advanced"

You do not have to change any parameter.
4 Now you can select the Port Number you like to use.

Do not change any of the other parameters.
5 Click OK and close all open Dialogs

Finished !