J-301 connector in the back has all the required signals for the basic interface to Digirig’s audio socket:
terminal 1 → 3.5mm TRRS ring 1 (RIG_AFIN)
terminal 2 → 3.5mm TRRS sleeve (GND)
terminal 3 → 3.5mm TRRS tip (RIG_AFOUT)
terminal 4 → 3.5mm TRRS ring 2 (RIG_PTT)
Additionally, the transceiver supports serial CAT control via the standard DB-9 RS-232 connection. It can be interfaced with Digirig Mobile in RS-232 configuration using the serial cord from Kenwood DB9 cable kit.