Detailed explanation modbus agreement in principle, for beginners to further understand the principle modbus done a very good guide

Modbus通信通讯教程\第一章：控制设备通信慨况.pdf
..................\第三章：以C++Builder设计 Modbus通信程序.pdf
..................\第二章：Modbus 通信协议说明.pdf
..................\第五章：Modbus通信最新发展.pdf
..................\第六章：使用Modbus注意要项.pdf
..................\第四章：以PC Based Controller设计Modbus通信程序.pdf
Modbus通信通讯教程

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