I'm a happy owner of the rig Kenwood TS-480SAT, I will share how I made the audio cable to interface the rig to a computer to work with digital modes like FT-8.
The minidin connector named DATA in the rig manual is basically the same as the old PS/2 cable for mouse or pc keyboard.
You can take an old keyboard and cut the cable on the keyboard side,
remove the outer sheath and the common sheild and then, with the help of a tester,
find which pin is connected to which internal cable, taking note of the colors.
for example, below is my case
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PS/2 male connector - front view:
Pin 1 - yellow
Pin 2 - green
Pin 3 - blue
Pin 4 - red
Pin 5 - brown
Pin 6 - black
On the rig side:
Pin 1 - GND
Pin 2 - to pc speaker
Pin 6 - to pc microphone
Then we will take two male jack 3.5mm connectors:
To pc mic:
Pin 1 connected to PS/2 pin 6 (black cable in my case)
Pin 2 not connected
Pin 3 GND to PS/2 pin 1 (yellow) and outer sheild
To pc speaker:
Pin 1 connected to PS/2 pin 2 (green cable in my case)
Pin 2 not connected
Pin 3 GND to PS/2 pin 1 (yellow) and outer sheild
For your convenience you can label the two jack connectors and use an usb sound card, as you see in the pic below, to leave the native pc sound card free.
Maybe you have to polish the PS/2 connector to fit in the rig.
