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Thank you very much for your quick reply! Actually, I'm on a short vacation abroad hence I couldn't test the code on my boiler yet. In the mean time, I'll try to find the particular data IDs for Quinta Pro but as I only have a Linux notebook available I am unable to install/extract the Recom .msi ap...

Hello, Does anyone have any plain C code to read/write the boiler status/parameters using an arduino board? Once again, I'm talking about the boiler serial port not the OT one. I've tried to clean up the @rjblake php scripts above with no luck (as they have severe curl/network/domoticz influences). ...

Hi, I thought about building an Opentherm gateway at first but then I realized that it might worth to add some more functionality (by incorporating a temperature sensor and some logic) to act like a standalone thermostat, too. That's it, by reading the boiler parameters (in gateway mode), I could ma...

Looks like I'll be walking alone (in this thread) for awhile thus I'm going to tell you a little story. Back in the 2012, I've just discovered this forum (and @Digit blog for that matter) and I was very impressed by the possibilities of fully controlling a HVAC system (Remeha boiler). As I was in th...

I've tried to add a further comment to my first post but the messages was in "moderated" stage for a whole day then it just vanished. Could anyone (mod) tell me why that message was censored? I was just asking if the communication through the RS232 port is "read only" on purpose ...

Looks like all the scripts written for the Remeha RS232 port communications only read data from the boiler. I thought this serial port is a decoded OT interface (TTL compatible). Am I wrong? Is this serial interface made "read only" on purpose (by the manufacturer)? The Recom software (whi...

Hi, It is possible to control a Remeha boiler (set point, status and so on) using the RS232 port? As far as I've read, everybody is using the OT port (by implementing a gateway). I don't have any OT thermostat (nor gateway) thus I want to control the boiler using an Arduino through a serial connecti...

I'm using quite a long cable (20m) but I put the RS232 converter at boiler's side (that's it, the MAX232 itself powered by the boiler's 4th pin) and the RS232-to-USB adapter at PC's side. You could try it too, by using two MAX232 (one at each end) to reproduce the TTL levels at laptop's side, to use...

Well guys.. I found my answer! I had to swap the Rx/Tx signals from the boiler. Actually, on Robert's page , the boiler Tx/Rx signals are from the RS232 side. But the boiler is "emitting" through third pin and is receiving through the second one. So the correct pinout are: 1-> GND; 2->RXD;...

Hello @bus147, I've just bought a new boiler (Remeha Quinta Pro 45) and I want to monitor/control it via PC. I also bought a RS232 to USB adapter and I built myself a TTL to RS232 adapter (MAX232). Unfortunately, Recom software refuse to see my boiler (I'm using latest Recom software version - v5.1....