说明：  CRC16校验，把第一个8位二进制数据（既通讯信息帧的第一个字节）与16位的CRC寄存器的低8位相异或，把结果放于CRC寄存器
(CRC16 checksum, the first byte of the first 8-bit binary data (both communications and information frames) with the 16-bit CRC register low eight different or put the result in the CRC register)