I have a Fronius Symo 8.2.3 Inverter and an Inepro Pro380-MOD Powermeter (actually a KDK COUNT3 PRO, but thats just a relabeled Inepro). A USB-rs485 dongle is in the mail.
What I want: With modbus rtu the inverter should be able to get all the readings from the powermeter. I want to use readings from both the inverter and the powermeter in openhab 2, via the usb-dongle.
My plan was to have a shielded pair of wires going from the usb-dongle to the powermeter, and from there to the inverter. The inverter already has a 120 Ohm resistor that can be applied via a switch, what I would do. OK so far? Then I could start to string the cables before all of the hardware is actually here.
I know next to nothing about modbus. Do I need to start reading, and if yes what would you recommend? Or does the modbus binding automagically configure everything for me and make it selfexplanatory? Then I could focus my resources on learning other stuff, openhab gives enough opportunities for that.