Check the terminal labels for the exact meter model
Terminal positions differ between the Fronius 63A1 and 63A3. Follow the manufacturer wiring diagram and connect RS485 A/+ to controller A, RS485 B/- to controller B, and the communication reference to GND when available. Do not copy terminal numbers from a different Fronius meter.
You MUST give each devicea unique address on the RS485 bus. Check the device manual for instructions.
Use lower addresses first (1, 2, ...) because the SmartgridOneController will find them faster!
For each device, it is generally recommended to keep the factory-default baud rate, parity, and stop bits. The SmartgridOneController will scan those first.