Status:

readMultipleRegisters: START
Connected
Packet: 3398000000060503c5600002
Send
Wait data ... 
Data received
Packet: 33980000000705030400000fa4
Modbus response error code: NOERROR
Disconnected
readMultipleRegisters: DONE

Data:
Array ( [0] => 0 [1] => 0 [2] => 15 [3] => 164 )
Courant : 3.989