Inverter controller setting
External inverter control must be activated in the configuration menu of the inverter via the LCD screen.
Click shortly on the button down.
You'll see "1. Enter settings", press button down for 2 seconds to enter the settings.
Go through the settings until you see:
Modbus Address or
Set ComProtocol
Press button down for 2 seconds to set the address.
Set the Address to the wanted value.