Connection to the radio
The radio is connected to the computer using a programming cable. The FT-7900 uses the same cable as that for the FT-7800, FT-8800 and FT-8900. The Links page of the website lists sources of ready-made cables that can be ordered over the Internet as well as several USB/serial adapters and DIY circuit designs.
If you are wiring your own cable the pinout of the packet socket on the rear of the radio is below. Use pin 3 PTT for data and pin 2 GND for ground.
Selection of Com port number is done using the Settings menu. The program will remember the selection you make for the next time you run.
There are two commands available - 'COM port Detector' and a pop-out called 'COM Port'. If you are certain about your COM port number then it is quickest to use the 'COM Port' pop-out. Otherwise use the 'COM port Detector' command. The following screen is shown:
Follow the on-screen instructions to detect and set the COM port for your programming cable. Be aware that each USB socket on your PC will be allocated a different COM port number, so you may need to use this screen again if you change your usual socket.