Opentherm Monitor

Post by **Ian Johnson** » Tue Feb 27, 2007 4:41 pm

does any one know of a lowcost Opentherm monitor that connects to a RS232 interface suitable for a PC.

Post by **Digit** » Wed Feb 28, 2007 12:32 am

Hi Ian,

Yeah, i do.
I know there has been an article in a dutch magazine a few years ago, named "Elektuur". It contained a schema to put between your heating and thermostat. It's written in dutch, but maybe it can be of use to you.
I think i have this article somewhere, give me some time to find it.

Regards,
Digit.

Post by **Bwired** » Wed Feb 28, 2007 12:50 am

Stop searching Digit.... here is is de opentherm schematic

<b>Download Attachment:</b> [img]images/icon_paperclip.gif[/img] Opentherm.pdf
Regards Pieter

Post by **Digit** » Wed Feb 28, 2007 1:00 am

Thanx Pieter...

I already found it..on this forum, by searching on "Opentherm"...[:D]

Regards
Robert

Post by **Bwired** » Wed Feb 28, 2007 1:04 am

Yes you are right

In my first search I missed it!
Here is also the topic http://www.domoticaforum.eu/topic.asp?T ... =opentherm

Post by **gason** » Thu Dec 13, 2007 2:56 pm

hello guys,

i hope some one can help me with my problem.
my heting solution is Elko Klöckner + Siemens QAA73 controller.
both devices communicate over open therm plus.
my questions are:
- are open therm and plus compatible?
- can i use the open therm interface suggested by Bwired in this tread for read /write the settings? which software can be used here? possible to buy an ready to use interface? -> http://www.domoticaforum.eu/topic.asp?T ... =opentherm
- is it possible to replace the original QAA73 controller (this work very well but no PC connection possible) whit other one who can be connected to PC or X-10 (not implemented yet) directly for read/write and visualisaton on the server?

Thank you in advance for suggestion.

Post by **Bwired** » Fri Dec 14, 2007 2:49 am

Hi Gason,
As you have figured out yet, we all are struggling with the opentherm interface. Nobody on this forum has a fully interface running yet. You can try to make the elektor opentherm interface mentioned in this topic and you have to write the software/driver yourself. Haven't seen software for this schematic yet. For your other questions I have no answer, we don't know the Elko Klockner in the Netherlands

. I'm still working on my opentherm interface with help of the official Nefit servicekey bleutooth device. But since a couple of day's I'm not sure anymore if this key is working with a opentherm interface, could be a complet other interface while my room controller (thermostat) is working with opentherm for sure!

Post by **gason** » Fri Dec 14, 2007 11:54 am

hi Biwired,
it's too bad... but thank you for your answer.
keep going your work i hope it will be sucessfull

Post by **Bwired** » Fri Dec 14, 2007 12:26 pm

Same to you, and i'm sure in the near future "open"therm will open up

I will keep track also on the German forum.

Post by **scientific** » Fri May 02, 2008 10:31 am

Hi,

Does someone has a specification of the opentherm protocol?

I need it to be capable to instruct my heating!

thx.

Filip