结合实际工程经验，详细介绍了ModBus RTU通讯协议，内容全面，浅显易懂，适用于初学者，也可以用来当成工具书。-Combined with practical experience in engineering, detailing the ModBus RTU protocol, comprehensive, easy to understand for beginners, can also be used as a tool.

电力最常用的规约的学习资料，包括101,102,103,104，modbus，cdt，其中104还有测试程序，及解析工具；- The most commonly used power statute learning materials, including 101,102,103,104, modbus, cdt, where there are 104 test procedures, and analysis tool