How to Change COM Port Number on Windows

Some serial devices require a specific COM port number to function. In these cases, consult the manual of your serial device to determine the correct number to use.

To change the COM port number of a serial device in Device Manager, complete the following:

1. Open the Device Manager by pressing the Windows Key + R. Type “devmgmt.msc” and press Enter.
2. Expand the Ports (COM & LPT) section.
3. Right-click the COM port and select Properties.
4. Click the Port Settings tab and click Advanced.
5. Change the COM port number to an available COM port number.

Note: Multiple serial ports cannot share the same COM port number.

6. Restart your computer.

Note: Even if you change the COM port number back to the original number, you still need to restart your computer.