modbus485通信协议的C程序，修订，已被用于研究。

代码说明：

modbus485通信协议C程序，经修改已用于项目，熟悉后修改部分参数即可用于485通信相关项目。-modbus485 communication protocol C program, as amended, have been used for the project are familiar with some parameters after the change can be used for 485 telecommunications related projects.