I have a new Digirig that Iam trying to interface to a Yaesu FT-891 and the new VarAC digital mode program. I cannot get the frequency to change on the radio using the direct usb cable between the radio and PC. Anyone using VarAC with the FT-891?
With Yaesu FT-891 Digirig is not involved in CAT control and as you already determined it is handled via the direct USB cable connection. I googled for the relevant info and this resource appears to be relevant: