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I have tried two different modbus tcp tester both failed and they both provide low level transaction log in hex so I post it Pv inverter should be auto config to unit ID 3 and I have checked it from the system xml file according to user manual Even pv inverter failed, cluster controller...

I am using sma cluster controller as a gateway to communicate with pv inverter thought modbus tcp. However, cluster controller always respond modbus exception illegal function for the command I used below 00 01 00 00 00 06 03 04 00 04 00 02 to read the 30005 data from inverter 00 01 00 00 00...