understand function Code 0x43

[googles10000]

Can you please help me to understand what Function 0x43 does.
I see you used it in your Code, but I can not figure out how to build the Request or what the whole Meta Data in the Response means.
I need this to Talk to the Display. I have mailed to EPSolar but I got only the new Modbus Specification 2.4, but this Function is not described.

[symbioquine]

Possibly this will help others who stumble on this issue; https://gist.github.com/symbioquine/95ba2abaf046c8e034b41e4cf3c334a9