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1、The Design of Embedded MCU Network Measure andControl SystemGAO Guanwang, WANG Yanpeng, SHA ZhanyouCollege of Information Science and Engineering,Hebei University of Science and Technology, ,Shijiazhuang Hebei, ChinaAbstractThis paper introduces a type of embedded MCU network measure and control sys
2、tem based on Ethernet, which adopts high speed MCU with kernel of 8052. Through controlling the special chip for Ethernet, the system realized the function of TCP/IP protocol. Since the system can be used as a independent system, any computer on the net can control the system or transmit order and d
3、ata to the system through standard TCP/IP protocol. Equipped the system by digital temperature sensor, it can be used to measure industry field temperature and transmit the results to computer through network, and then get temperature curve. And its measure and control range are all -10125,the accur
4、acy is, the resolution reaches 0.1. This system have many advantages such as simple structure,better universal, communicating through network, flexible usage, low cost etc. It can be adapted by various of intelligent sensor and has better extend ability. It can be used in the fields of remote data a
5、cquisition, remote measurement and control and so on.Keywords: Embedded MCU Network Measure and Control System; Ethernet; System parameter; Digital Temperature Sensor.1.IntroductionThe development history of the measure and control system experienced six phases in the following. (1)The traditional c
6、ontrol system consists of MCU, PC or IPC. (2) The measurement and control system based on PC bus. (3) Distributed Control System (DCS). (4) DCS system based on LAN. (5) HART bus which is developed by the 2-wire 4mA 20mA standard signal, and is a kind of fieldbus used between the intelligent field eq
7、uipment and automatic control equipment. (6) Since 90s of the 20th century, with the rapid development of the Internet, it becomes possible that more quickly, more convenient and more economical gaining and exchanging information. So measurement and control system can become the client of the global
8、 network. At present, the remote control system based on internet is driving the development of measurement and control technology, and has been applied in monitor fields of the nuclear power station, the oil transport pipeline, the power networks run and robot. The remote control system based on in
9、ternet has advantage of the quick information transfer, strong interactivity and low cost, while it can achieve data sharing.The existing network control equipment use mostly MODEM chip, with the PPP protocol dialing to the internet or special network by telephone network. Although this method can r
10、ealize the network control and data transmission, it depends on the telephone, make its use cost increase significantly. Additionally, transmission speed is no more than several hundreds kbps (usually only a few tens kbps or lower) because of the limit of telephone network, and it is not adequate fo
11、r the needs of large quantities of data transmission. Therefore, the network measurement and control technology based on Ethernet get more and more important. The ethernet is a widely used LAN standard, which can be defined by IEEE-802.3 standard, and it can support 10Mbps, 100Mbps, or 1000Mbps band
12、width, often with twisted-pair cable or fiber as the transmission medium. Its characteristic is the low price, mature technology, flexible application.2.Design Scheme of Edesign Plandesign Plandesign Plandesign Plandesign Planmbedded Microcontroller Network SystemIt is a type of embedded MCU measure
13、 and control system based on Ethernet network system, using a microprocessor with 8052 as kernel. It realized common ARP, IP, ICMP, TCP and UDP protocol part function of TCP/IP on Ethernet by controlling RTL8019AS which is a special Ethernet chip. It can be used as an independent system on Ethernet
14、network. Any computer on Ethernet can visit the system via the standard TCP/IP protocol, transport control commands or data among them. The system function has the following characteristics: (1) the simple structure; (2) with low cost, it is convenient to apply in many nodes; (3) strong adaptation c
15、an be used with various equipment; (4)it can communicate through the Internet. This system used serial interface for data acquisition, it can adapt all kinds of intelligent sensor and has strong ability of expansion, and can be widely used in remote data acquisition, remote control, etc. The circuit
16、 diagram and the system program flowchart of embedded microcontroller network system are respectively shown in figure 1, figure 2In order to realize the standard TCP/IP protocol with microcontroller, Winbond Company W78E58 MCU production is used as main control chip in the circuit design. The W78E58 MCU can meet the following three conditions: the first, it is compatible with MCS - 51 series microcontroller, the second, the internal program memory is 32KB, and it i
