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value is 4
0xBACC
2byte
CRC CHECK
Respond：01 10 0200 0002 4070
0x01
1byte
Address
0x10 (HEX)
1byte
Function number16 (DEC)
0x0200
2byte
Start register address, high byte in the front
0x0002
2byte
To read the number N Register, high byte in the
front
0x4070
2byte
CRC CHECK