Jim,
Note that Simon is working on an update and fix for the HRD satellite module, and the preliminary screen shots look great. Stay tuned.
Otherwise, I have used SATPC32 for years with the FT-847 with great success.
.. how to interface with the radio.
Are you referring to the hardware needed? If so, all you need is a null modem cable, a serial port, and an FT-847 with a bi-directional CAT. That last is rather important, and applies to all but the first few production runs. A USB serial port _should_ work fine, but some have had trouble and needed to have the delay parameter in the setup tweaked. I had one which would not work no matter what I did, but that was a special case.
If you could give us some specifics of the problem, there is a good chance a solution exists.
Alan WA4SCA