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Indeed a wrong cable from the webshop. I opened the connector and changed the wires. Thanks again for your help.

Thanks. I can talk to the OTGW now:-) Next phase of my project start now.

Hi I'm new to his forum. I bought the RS232 assembly and put it together. Connected via RS232 to my laptop (only gnd, Tx & Rx). Put COM1 to the required speed, stop bits, etc. I receive the message: Opentherm gateway diagnostic – Version 1.1 1. LED test 2. Bit timing thermostat 3. Bit timing boi...