I know ADE iD was a data BUS, I was told it was a proprietary version based around RS485 no idea how true that was.
I recall Map6 was based around zener diodes of different values, but I only ever seen one in all my years.
No idea about HKC, I assume it's not ADE iD? If so I don't see the point, why not just be BUS based like keypads be that 485 or whatever the panel uses.