"Connect" modbus devices

[Stieges]

In general yes but the DPT might be different for 74/78 can you read it correctly?

The heat pump has no internal value for PV production. If i read it the value is always 0 which is probably right. i can read 4122 with input register, float32 and read swap n.
And i somewhere have read that 74 and 78 need holding register. which makes sense since you can not write to inputregister right?