https://blog.csdn.net/bijinsong/article/details/79373621
https://wenku.baidu.com/view/d233d09feff9aef8941e0698.html
file:///C:/Program%20Files/Modbus%20Tools/Modbus%20Poll/quick.html
https://www.amobbs.com/thread-3339982-2-1.html
原文：https://www.cnblogs.com/legion/p/9404229.html