This radio features D-SUB 15 accessory connector (source):
Digirig Audio Cable will look like this:
D-SUB15 pin 2 (AF IN) → 3.5mm TRRS ring 1 (RIG_AFIN)
D-SUB15 pin 3 (AF IN) → 3.5mm TRRS tip (RIG_AFOUT)
D-SUB15 pin 4 (AF GND) → 3.5mm TRRS sleeve (GND)
D-SUB15 pin 9 (MOD PTT) → 3.5mm TRRS ring 2 (RIG_PTT)
if PTT doesn’t work with this configuration then add
D-SUB15 pin 4 (AF GND) → D-SUB15 pin 12 (GND)
The manual mentions CI-V line. This would require Digirig Mobile in CI-V configuration. Serial cable will look like this:
D-SUB15 pin 1 (CI-V) → 3.5mm TRRS tip (CI-V)
D-SUB15 pin 12 (GND) → 3.5mm TRRS sleeve (GND)
Alternatively, there may also be a possibility of GPS readout from pin 5 into Digirig’s serial port.
Fallback option for the audio connection can use mic port:
GX16-8 pin 1 (MIC) → 3.5mm TRRS ring 1 (RIG_AFIN)
GX16-8 pin 3 (AF) → 3.5mm TRRS tip (RIG_AFOUT)
GX16-8 pin 5 (PTT) → 3.5mm TRRS ring 2 (RIG_PTT)
GX16-8 pin 6 (GND) → 3.5mm TRRS sleeve (GND)
GX16-8 pin 7 (MIC GND) → 3.5mm TRRS sleeve (GND)
Please report the results of your builds.