I would just like to add at this point …
With hindsight, I'd recommend to potential purchasers of the Hicon 7766, that it probably makes more sense to buy the MPG06 Pendant at the same time; unless you have at least a couple of spare days to work out the wiring, ask the questions, and to be fortunate enough to get the answers.
That said though - I have very much enjoyed learning about the workings of this pendant, and have gained some valuable insight into my Hicon controller and Mach4 configuration. It's great to talk to knowledgeable people who are kind enough to share their insight.
… It's not the destination so much as the journey.