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You could do half-duplex, I have an example here:Gammon Forum : Electronics : Microprocessors : RS485 communications
You send a query, switch back to listen for a result. This could be done multiple times a second (eg. "turn LED 4 on, are any buttons pressed?").
thanks this together with some phantom power circuit or POE could do the trick.
any ideas?
If you go this route, you might need over voltage protection. since LTC1480 might be uncomfortable with short to 44 and 57 volts DC. Here is the plans;-
Plan A.
Dia Surge Suppressor Discharge Gas Tube
Plan B.
Clamping diode
Plan C.
Catcher diode
Plan D.
Zener diode
Plan E.
Metal Oxide Varistor
Plan F.
Multi-layer varistor
Plan G.
TVS diode
Plan H.
TVS IC
I am sure this list could be very long. I just started.