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How do I know what COM port my USB is?

How do I know what COM port my USB is?

Determine the version of USB ports on your computer

  1. Open the Device Manager.
  2. In the “Device Manager” window, click the + (plus sign) next to Universal Serial Bus controllers. You will see a list of the USB ports installed on your computer. If your USB port name contains “Universal Host”, your port is version 1.1.

How do I use prolific USB to serial comm port?

Double-click “Prolific USB-to-Serial Comm Port (COM X)” to view the USB/Serial Adapter’s Properties. Click on the “Port Settings” TAB and click “Advanced”. From the drop-down box, select a free COM port number between 1 and 4. Do not select a COM port already shown as being “in use”.

How do I download a Serial driver to my USB?

Option 2 – Automatically update USB to RS232 drivers

  1. Download and install Driver Easy.
  2. Run Driver Easy and click the Scan Now button.
  3. Click the Update button next to the driver to automatically download the correct version of that driver, then you can manually install it (you can do this with the FREE version).

Is a USB port a serial port?

A virtual COM: port in a USB device is simply a serial port coming out of that USB slave device as an endpoint. Windows will give it a number (COM1:, COM27: etc.) and that serial port can be recognised and used by any program using the standard Windows API for COM: ports.

What is COM port used for?

COM (communication port) is the original, yet still common, name of the serial port interface on PC-compatible computers. It can refer not only to physical ports, but also to emulated ports, such as ports created by Bluetooth or USB adapters.

How do I assign a COM port to a USB?


  1. Go to Windows Device manager > Multi-port serial adapters.
  2. Select the adapter and right click to open the menu.
  3. Click on the Properties link.
  4. Open the Ports Configuration tab.
  5. Click on the Port Setting button.
  6. Select the Port Number and click OK.
  7. Click OK to apply the changes.