# Finding the Appropriate COM Port for a USB to Serial Adapter

Verify that the USB to Serial Adapter connected to the KX3 is the one you have chosen on the Port page.

If your computer has several USB ports, different COM port numbers may be assigned depending on where you plug in the USB to Serial Adapter.

The Windows Device Manager can help you to find the appropriate COM port.

- Open the Start menu
- Right click "Computer" or "My Computer"
- Select "Manage"
- In Computer Management's left pane, select Device Manager
- In the right pane, click the "+" next to "Ports (COM & LPT)" to view the available COM ports and a description of the associated hardware. An Elecraft KUSB is shown as a "Prolific USB-to-Serial Comm Port". Prolific Technologies manufactures the chip set within the KUSB. Newer KUSBs are implemented with an FTDI chip set.
- You may find it helpful to remove the USB to Serial Adapter, examine the list of COM ports, then plug in the USB to Serial Adapter and look for the COM port that was added when the USB device was plugged in