Changing COM Port Address
Some serial devices need a specific COM port in order to work. If your serial device works properly, do not change this setting. This option is only for Windows 2000/XP/Server 2003 respectively.
1.From the Device Manager window double click Ports (COM & LPT), then double click PCMCIA
2.Click Port Settings tab and click Advanced.
3.Click the down arrow that is next to the COM Port Number box and select a COM port that is not in use. Click OK.
4.Click OK, then close Device Manager to save the changes.
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