Is there a standard convention for what the output terminals of a thermostat do? - in particular Honeywell thermostats.
The installation manual for the Honeywell RTH1100 thermostat shows its terminals are named Rh, Rc, W, Y, G. However, the wiring instructions tell what color wires to connect to the terminals, not what the terminals do.
I assume W is common, and G is ground.
I think Rc and Rh have to do with running the system being controlled on high or low. I think these outputs are either off or 24 V. I don't know if both outputs can be on at the same time.
I don't know what the Y terminal does.