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Unfortunately there is no way to get in between the two. My thermostat is placed on the wall and its two wires go straight to the outer wall of the balcony. Placing a Raspberry Pi is my only way out :) But I would like to see a more native GPIO- RS232 first and a webinterface :) Ill follow the projo...

The theory about the voltage divider part turned out to be correct, so receiving data from the gateway worked straight away in my test setup. The trouble I described was with sending commands to the gateway. That's where you would use the buffer chip. So then the circuitry would look something like...

Dear All, I am following this project already for quite some time, and it is really interesting. For me though, living in Amsterdam with the Boiler outside at the balcony :)) it is impossible for me to connect to the RS232 port. The only sensible way to go for me is Raspberry Pi. Of course I would l...

i would also like to acquire a imt350, I am Dutch as well. I got three remaining questions; I wonder, does this work seemlesly work with Opentherm standard? If I use a Power Over Ethernet switch, would that be sufficient to power this? Do I need to wire Switch->Imt350 and imt350->central heater ? im...