RS485总线测控模块的MODBUS扩展协议设计

Design of Extend MODBUS Protocol for RS485 Bus Module of Measurement and Control

简单介绍了MODBUS协议,针对RS485测控模块的实际需要,定义了该协议的扩展功能码。并对通信协议的实现细节进行了说明,给出了采用C51设计实现的通信协议程序。

In this paper,the MODBUS protocol is introduced generally.For module of measurement and control,the extend function of MODBUS protocol is defined.The author describe implement of the protocol in detail.In the end, the C51 program code of protocol is presented.