How Do I Change the COM Port for a USB Serial Adapter on Windows?

Q: How Do I Change the COM Port for a USB Serial Adapter on Windows?

Originally authored by: Bernie Thompson, July 4, 2011To change the COM port for a USB Serial adapter on Windows, you must adjust the advanced port settings within the Device Manager. This is often necessary because Windows may automatically assign a high COM port number, while many legacy applications expect a port between COM1 and COM4.How to Change the COM Port Open the Device Manager and expand the Ports (COM & LPT) Right-click on your USB Serial adapter device and click on Properties Select the Port Settings tab and click on the Advanced button Click on the COM Port Number drop-down menu to change the port to the required port number, ideally between 1 and 4 (some legacy applications expect a COM port in this range) Click OK on all open Property windows to apply and save the settings. The updated COM port number should now be reflected in the Device Manager Applicable ToPL2303-DB9

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Accepted Answer

Originally authored by: Bernie Thompson, July 4, 2011

To change the COM port for a USB Serial adapter on Windows, you must adjust the advanced port settings within the Device Manager. This is often necessary because Windows may automatically assign a high COM port number, while many legacy applications expect a port between COM1 and COM4.

How to Change the COM Port

Open the Device Manager and expand the Ports (COM & LPT)
Right-click on your USB Serial adapter device and click on Properties
Select the Port Settings tab and click on the Advanced button
Click on the COM Port Number drop-down menu to change the port to the required port number, ideally between 1 and 4 (some legacy applications expect a COM port in this range)
Click OK on all open Property windows to apply and save the settings. The updated COM port number should now be reflected in the Device Manager