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Hi, I have got problem with my thermostat because it is not setting room temperature value sent by opentherm gateway. My thermostat is Bosch TRZ200. But when I open the case I can read Honeywell CS0257A-LS I coluldn't find much details about it on google. This is a pic of it while it is without case...

Hello again, OK, it is working now. As you mentioned above, I used Arduino software serial and I can send and receive data without any loss. That's great. Thank you all. I have another problem now but I think it is about my thermostat. It is not setting room temperature value with the command send b...

Any suggestions?

Hello, I got opentherm gateway running version 3.4 and I have pulled out max232 IC. I have connected arduino to communicate with opentherm-gateway. Everything works fine in monitor mode. I write up a basic sketch. It prints all serial data readings to arduinos serial interface and I can also use ard...