How to translate data like "B501812F5"?

This Forum is about the Opentherm gateway (OTGW) from Schelte

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Nightlens1
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How to translate data like "B501812F5"?

Post by Nightlens1 »

Hi all,
I've got my gateway successfully connected between my thermostat and boiler and am able to see what happend using the OT monitor. Now I would like to connect the gateway to an arduino or a spark core, so I can log the temp, etc online without the need of a computer running 24/7. Although I'm able to receive the data send by the gateway over the serial connection to my arduino, I havent figured out a way to get some more useful info out of the code send, like "B501812F5".I understand the meaning of B and T. But what about the rest.

Is there any "easy" way to extract the Data ID, etc?

Regards, Rutger
hvxl
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Re: How to translate data like "B501812F5"?

Post by hvxl »

Check out the Opentherm specification on what the hex data means. You can find the data ID in the 3rd and 4th digit. In your example that's 0x18 = 24.
Schelte
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