I have bought a Systemair SAVE mostly because it has a well documented MODBUS interface included. I have purchased an RS485 adapter to my domoticz units and I'm willing to help to try things out. https://www.google.se/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&ved ...

Just wanted you to know that I have the exact same issue with my ds2438:s.