Remote controlling House Temperature

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I have one of these installed

Heatmiser PRT

but am thinking of changing to one that supports rs485 :-)

like this one

Heatmiser-PRT/HW-N.html

Heatmiser will give the protocol docs out, and it looks similar to resol vbus :-)

EDIT: they sent me the docs for V3 protocol which is the current shipping model

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