It appears to be ok.
In that case, you are not connecting to the solar controller.
Check on the board (along the paths) to which pins A and B are actually connected, if you are sure to the middle two of this rj-12
The discussion revolves around the integration and functionality of the ecoNet 300 internet module and ecoLINK2 cable with various heating systems, particularly focusing on Plum controllers like ecoMAX 860 and ecoSOL 500. Users share experiences regarding connectivity issues, firmware updates, and the compatibility of different RS485 converters. There are insights into the communication protocols used, troubleshooting steps for connection problems, and methods for reading and sending parameters to the heating systems. The conversation also touches on the challenges of using non-original econet modules and the implications of firmware customization by different manufacturers. Summary generated by the language model.
