I've heard of people making this radio work with RemoteRig but not much in terms of wiring and configuration. I got it working by using settings and hardware and wiring configurations as a combination of a D710 and a TS-2000.
On the control side, the D700 mic works as-is. Note that it works just as a mic. No up - down or VFO switching or memory control or other functions. Just plug into RRC-control Aux/mic input. The D700 control head plugs into the RRC-control TTL port with the normal 6p4c (4/6pol) to 4p4c (4/4pol) cable supplied by Kenwood used to separate the D700 control head from the main radio unit. Strap the Aux/mic and jumper as a D710 on the RRC-control. Attach a speaker. Set the "radio settings" menu as a TS-2000.
On the radio side, use an RJ-45 straight through cable from the Aux/mic port on the RRC-radio to the main unit mic input. The black one supplied by Microbit works fine. Use a straight 6p4c to 6p4c cable from RRC-radio TTL port to main unit control head input. You can buy or make one. Strap the Aux/mic and jumper as a D710 on the RRC-radio. Connect from radio speaker output to RRC-radio speaker input ("sp") with normal 3.5 mm stereo plugs. Set the "radio settings" menu as a TS-2000.
I think I got it all. Now I can check into my public service weekly net while on vacation this week.
73 Tedd K6OI