Cables for Yaesu FTM-3100R and Yaesu FT-2980R

To enable the digital modes we’ll need to collect audio in, audio out and PTT from two different connectors:

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RJ12 pin 4 → 3.5mm TRRS sleeve (GND)
RJ12 pin 5 → 3.5mm TRRS ring1 (RIG_AFIN)
RJ12 pin 6 → 3.5mm TRRS ring2 (PTT)
3.5mm TS or TRS sleeve → TRRS sleeve (GND)
3.5mm TS or TRS tip → TRRS tip (RIG_AFOUT)

Manual can be found here.

Prototype cable build: