串口发送modbus协议CRC校验低字节（若为查表所得数据为高字节，其实为CRC的低字节）-serial modbus connection agreement low byte CRC (if available for look-up table for the high-byte data, In fact, for low-byte CRC)

完整的CRC循环冗余校验码程序，C语言编程

串口工具调试 源代码 测试使用 练习 带CRC校验 modbus测试练习-Serial debugging tool with source code to test the use of practice exercises to test modbus CRC checksum