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Joe Novosel's Elk Notes

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Elk M1 Zone Temperature Sensor protocol decoded

Posted by N4HC , 03 June 2012 · 1814 views

and 1 more...

Through reverse engineering I was able to decode the protocol used to transmit temperature to a main zone input on the Elk M1 control. This will ONLY work on a main zone and NOT on an input expander. This is by design on the Elk itself.

So here it is. Manchester encoded:

· 3 start bits of ‘1’
· 8 data bits –...

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