Research And Implementation Of Embedded WEB Server For Modbus Devices

The two key technology in IT field include Embedded technology and Ethernet technology.And they certainly will become the future developing trend.Network technology has played its own advantages,include networking,information interaction and resources sharing.Embedded technology has advantages in processing control ability,their combination can create more applications.In the embedded processor as the basis of hardware,Embedded web sever has completed TCP/IP protocol’s establish,achieved network communication.Through the HTTP service,it can realize page interaction,and play a role of remote monitoring system.Modbus protocol is a communication protocol,it is widely used in industrial.At first,its version of Serial link protocol has long been the dominant in the market.Later Modbus TCP Ethernet protocol realizes Ethernet communication for equipment.In the beginning,Modbus serial link protocol does not support Ethernet communication,its disadvantages are limited communication distance and low communication rate.Therefore,using Cortex-M3 micro processor combined with RS232 and Ethernet communication establishes a Modbus protocol conversion module.Through the Ethernet,RS232 communication method,the module can communicate with various devices supporting Modbus protocol.And it succeed in connecting Modbus devices to Ethernet,using the protocol device conversion function of the module,the handlers can implement networked remote control to Modbus serial devices through the Ethernet.The first two chapters put forward the overall design scheme and research method through the functional requirements of the system.The third chapter describes principle diagrams of hardware part in detail.The fourth chapter introduces the software system program design idea.At last,the operation of the system is stable and reliable.