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
I have enable modbus tcp function and config my inverter to be Unit ID 3
Anyone with experience in sma can help?