How do I check to ensure the COM port is listed properly in Windows?

To ensure your serial device is installed properly, complete the following: Open the Device Manager by pressing the Windows Key + R . Type “devmgmt.msc” and press Enter . Expand the Ports (COM & LPT) section. You should see a COM number in brackets to the right of each port, and there should not be any exclamation points or question marks next to the entries in the list.