MODBUS CRC ɹ
1. ѡ "CRC-16/MODBUS  X16+X15+X2+1 "
2. HEXڣҪ16
3. CalculateťCRCʾѼǰ16뻥λã
   Ҫ16γMODBUSָ
4.  CRC 01 03 00 00 00 02 0BC4 λúMODBUSָǣ
          01 03 00 00 00 02 C4 0B 