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I have a honeywell rth8580wf heating thermostat. I wonder what the output of the "white" terminal is (heating control). Is it only going from 0V to 24V or is it continuous depending on the room temperature?

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closed as off-topic by laptop2d, pipe, uint128_t, Wesley Lee, Dmitry Grigoryev Mar 20 '17 at 10:11

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  • "Questions on the use of electronic devices are off-topic as this site is intended specifically for questions on electronics design." – laptop2d, pipe, uint128_t, Wesley Lee, Dmitry Grigoryev
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  • \$\begingroup\$ Try contacting Honeywell for the data sheet. \$\endgroup\$ – Leon Heller Mar 18 '17 at 15:15
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It's a contact closure. When the thermostat wants heat, it closes a contact between the "Rb" and "W" terminals, which allows current to flow.

Here's a good reference for thermostat wiring in general.

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