Hello Gavin, since I don’t use HDR I can’t answer that for you. But I could imagine it should work with a program like “com to com” as a port splitter! Vy 73 de Jan-Peter -DL3KVT
You could try opening wfview first and then using the virtual serial port to connect HRD to wfview.
For the waterfall and rapid tuning support, you need wfview to have a direct connection. It’s also best to make sure CI-V Transceive is turned ON on the radio.