I’m in the same boat. Digirig with the ICOM RJ45 cable. Cannot get it to talk to the 2730. running out of radio SP2 and into the Serial line for the DL. Tried with FLRIG and FLDIGI. 9600,N81. for me COM3. In FLRig, COM doesn’t show, but in FLDIGI it does.
Pretty frustrated.
Ed