Connect your K3 via a 9-pin straight-through serial (RS-232) cable to your computer.
If your computer does not have an available serial port, you may use a USB to Serial Adapter such as the Elecraft KUSB.
Choose the Computer's serial port that is connected to the K3. Click the arrow to open a list of available ports, then select the port you have connected to the K3. See Finding the appropriate serial port for a USB to Serial Adapter if you're using a USB to Serial Adapter and are not sure which port to choose.
Click to update the list of available serial ports, which may be helpful if you plug in a USB to Serial Adapter after the program has started.
Verifies that the K3 Utility can communicate with the K3 and determine its RS-232 bit per second setting.