https://www.cnblogs.com/axinno1/p/8521481.html
https://blog.csdn.net/xukai871105/article/details/21652287
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freemodbus modbus TCP 学习笔记
https://www.cnblogs.com/magic2008/p/6572778.html
freemodbus移植讲解 ZZ
https://www.cnblogs.com/luomingui/archive/2013/06/14/Modbus.html
Modbus通讯协议学习 - 认识篇
https://blog.csdn.net/xukai871105/article/details/16368615
MODBUS协议整理——汇总
https://blog.csdn.net/xukai871105/article/details/17471865
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来源：https://www.cnblogs.com/CodeWorkerLiMing/p/11332170.html