基于Modbus通信协议的智能仪表设计

Intelligent Instrument Design Based on Modbus Communication Protocol

Modbus协议由于其开放性、透明性、低成本和易于开发等特点，已成为当今工业控制领域最流行的通讯协议之一。RS-485串行通讯总线是一种性能优良的现场总线，采用RS-485总线作为网络通信的物理层，使用Modbus通信协议来设计智能仪表的通迅程序，增强智能仪表的互换性，同时解决了上位计算机系统开发数据通讯驱动程序困难的问题。

Because of its features of wide openness, transparency, low cost and easy developing. Modbus has become one of the most prevalent communication protocols in industrial control field at present. RS-485 serial communication bus is a kind of field bus, which with the better performances. By adopt RS-485 bus as the physical layer of network communication and using Modbus protocol to design the communication program of the intelligent instrument,the compatibility of the instrument has been enhanced. And also it resolves the problem with driver program developing of data communication in host computer system.