Reading the ebus…

 Apr, 22 - 2014   6 comments   Smarthome

As mentioned before I want to connect my qnap with my Vaillant Calormatic heating system. I’m using this device in order to read the ebus traffic via USB.

I had to get a new cable from my basement office to the heating room, which was more complicated than I expected (I guess that is always true when it comes to cables at home…) but the good news is that everything is now connected and running.

The ebusd is able to read the ebus. Now I’m struggling with the vendor specific commands which are -of course- undocumented. I called Vaillant and their official reply was: We decided to keep our commands as a secret. Well, at least it was an honest answer. I hope they’ll learn that this is not the right direction, but in the meantime I need to get this up + running.

So I’m still trying to decode the specific calormatic commands in case of any progress (or resignation) I’ll let you know 😉

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 Comments 6 comments

  • Avatar Siegmund sagt:

    Hello Dominik,

    as you may already know, I have contributed all my knowledge about Vaillant specifc commands (VRS620) at (please look at the attached documents there):

    <a href=““> </a>

    If you have some additional hints, you are invited to participate.



  • dhelleberg dhelleberg sagt:

    Thanks, I’ll have a look!

  • Avatar Vincent Verbist sagt:

    Hi Dominik,

    I’m planning on using the same hardware (‚but on a RaspBerry Pi) to read data from my Vaillant thermostat. Just a quick question, the eBUS to usb-connector, does it need a seperate cable to connect to the thermostat? If so, which one did you use?


    Thanks! And a happy new year.

    • dhelleberg dhelleberg sagt:

      Happy new year 😉
      You need to connect via ebus, which means you need to have 2 wires minimum. I use a typical (german) phone-cable which houses 4 wires and has a shield.

      • Avatar Vincent sagt:

        Hi Dominik!

        Thanks for your answer, of course, this rj22 cable is the same here in Belgium so I will be using that one as well. Hopefully the eBUS connector is in stock by the end of this month.

        Kind regards,


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