Hmm, CoolPlugs -- this looks pretty clean to me -- looking closer, you're actually connecting to that internal serial port on the Mitsubishi heat pump controller board, and then providing some microcontroller-based hardware middleman that presents the heat pump over multiple interfaces of the installer's choice,?documenting in detail how to interface with each one.? That's ideal if you ask me!
Get a CoolLinkHub and CoolPlugs (CP-ME)
The Plugs can run wireless or wired(modbus daisy chain), and get powered from the indoor unit.
One Hub. One CoolPlug per each Indoor Unit.
Home would talk to the CLH via Bacnet.
I actually work for CoolAutomation now, in full disclosure, but this is the best solution out there. I used them as an installer all the time...
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