Port

Connect your KH1 via a KXUSB serial data cable to your personal computer.

Port tab image

COM Port

Choose the Personal Computer serial (COM) port that is connected to your KH1. Click the down arrow to show the list of available COM ports and then select the COM port you have connected to your KH1. See Finding the appropriate COM port for a USB to Serial Adapter if you're using a USB to Serial Adapter and are not sure which port to choose.

Close Port

Closes the serial port, which stops polling and releases the serial port for other applications. The serial port will be re-opened if Test Communications or Check Version Now is clicked.

Test Communications

Reopens the serial port and verifies that the KH1 Utility can communicate with your KH1.

Note: If the KH1 is already loaded with MCU firmware (as indicated by a VFO frequency in the KH1's LCD display), it should respond to Test Communications with an "Information" dialog indicating that the KH1 is running the "Main" program.

KH1 in Main popup image

If the KH1 is in a "Boot Loader" state, as indicated by the letters "MCU LD" on the LCD display, the KH1 should respond to Test Communications with a "Warning" dialog that looks like this:

KH1 in boot load popup image

If the KH1 has a running MCU (as indicated by a valid VFO A display) and Test Communications results in this Warning dialog, the KH1 Utility is not communicating with the KH1.

If no responses are received, the KH1 Utility will continue to attempt to communicate with your KH1. The polling interval is increased over time. To stop polling and close the serial port, click Close Port.

A KH1 in its boot loader, modems, null modem cables, and defective serial cables can echo whatever is sent to them. The KH1 Utility cannot tell what device is attached without sending a block of firmware. If MCU firmware load fails on the first block (address x800), it is very likely that the communications cable is not correctly attached to your KH1, the cable is defective, or the wrong COM port has been chosen.