I just put together the Yaesu G5500 with a Green Heron RT-21 Az El controller.
Problem is finding the connection between Wxtrack and the controller. Not listed unless maybe some other dual use one?
Cant find anything in the Q/A of the site or all over the net.
I did find Pdftracker which list it as a choice. You would think someone could make a standard for this kind of interfacing.