Monitoring Remeha devices

[Digit]

Hi,
I found a very neat way to monitor my Remeha Calenta; it will probably also work for Avanta and Aquanta. Costs are <10 euro! (and some time needed for writing the code )
Here you can read about it:
http://blog.hekkers.net/2010/10/03/moni ... a-calenta/

[Menno]

Hi Robert,

Great work, i also have this Remeha Calenta with the RJ11 connector. I too was thinking of making my own cable to interface the Remeha to my domotica-system.

I will fine tune this circuit so that it is galvanic isolated from the domotica-server.

Please keep me updated with your work on a plugin or script.

[Digit]

Menno,

Would be great if you could do that; I wouldn't know where to start

[Digit]

Update:

I managed to decompose a large part of the protocol that is being used by Recom to communicate with my Calenta. Checksum, packet size and more are known now, which can help in creating a stable interface. There's only 1 byte left of which I don't know yet what it is being used for... (ideas, anyone?)
Check it out: http://blog.hekkers.net/2010/10/10/more ... -protocol/

[Mdamen]

Mr. "Knutselaar", nice work!

[Willem4ever]

Good Job Digit, I'll put this one on my shortlist when I need a new central-heating boiler.

[Niels]

Posts like this have made me decide to follow an IT-related education beside my fulltime job!
1,5 years later i'm still nothing worth on this field, but going to school again (HvA) is fun

[MindBender]

The protocol is probably much like the Remeha GateWay protocol I documented at the bottom of this page a long time ago:
http://nerdclub.nl/remeha_gateway/index.html
You need to think out of the box a bit to understand the numbers: For example, the use hexadecimal fixed-point values, where the last byte may be the fractional part of the temperature in 1/256th degree.

By the way: We have started the development of a HomeSeer plug-in for the Remaha GateWay. It will be available in a couple of weeks.

[Digit]

The protocol is probably much like the Remeha GateWay protocol I documented at the bottom of this page a long time ago

No, it's completely different. All protocol info is in the Remeha Recom XML files; the rest is documented here:
http://blog.hekkers.net/2010/10/10/more ... -protocol/

By the way: We have started the development of a HomeSeer plug-in for the Remaha GateWay. It will be available in a couple of weeks.

That's great! (for people with older Remeha boilers, cause I've never managed to get my Calenta working with the Gateway)

BTW, this project is finished: http://blog.hekkers.net/2010/10/17/reme ... connected/

[MindBender]

I have just contacted our HVAC dealer, because developing a plug-in for an end-of-life product doesn't make much sense, and he said that there are different gateways for different boilers. He will contact Remeha to confirm this, and to confirm if my system will still work if we upgrade our thermostat to an iSense. To be continued...

[Digit]

My setup was the following (april-july 2009):
- Remeha Calenta;
- Remahe Gateway;
- Celcia 20;
- a helpful local dealer.

Before I bought the Gateway, I checked with Remeha if the Gateway would work with the Calenta."Yes, of course", so I bought the Gateway. But it didn't work; it was very unstable (as in working <1% of the time). After discussions over the phone, email, replacing the Gateway with a 2nd one, Remeha came to the conclusion that the Gateway apparently does not work with the Calenta, so I returned the Gateway to Remeha and got a refund. End of story...

[Rebel]

Nice to see Remeha is still actual.
I will follow the results,
Good luck!
Arjo

[Digit]

Hi,

For those who do not like soldering or don't need Ethernet, there's 3rd, very cheap and simple option to connect to a Remeha, with a simple FTDI cable:
http://blog.hekkers.net/2011/03/14/reme ... revisited/

[MindBender]

The plugin has been implemented. Two month ago already, but I just didn't have time to test it properly yet.

[Menno]

Did you create a plugin for Homeseer?