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Product FAQs


My serial device requires a specific COM port to function, how do I change this in 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.

  1. Restart your computer.

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