Based on below image this transceiver should accept 1200 baud miniDin6 audio/PTT cable from Yaesu FT-8xx kit or 9600 baud MiniDin6 cable.
Any Digirig configuration will work since we are not using serial port for CAT control here.
I can verify that the audio cable for the Yaesu FT-8xx kit sold here will work on the FT-7800R as well - i use it all the time with the Digirig Mobile for both FLDIGI and Echolink (I host an Echolink node to a local repeater). It should also work with the FT-7900 (I have one of those in my car and will test that soon) and most other Yaesu rigs with the DATA port.
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