基于现场总线技术的智能化门禁系统的设计与开发

【作者】 张波；

【导师】 王世卿；

【作者基本信息】 郑州大学 ， 计算机软件与理论， 2003， 硕士

【摘要】 信息技术的飞速发展，引起了自动化系统结构的变革，逐步形成以网络集成自动化系统为基础的企业信息系统。现场总线就是顺应这一形势发展起来的新技术。现场总线是当今自动化领域技术发展的热点之一，被誉为自动化领域的计算机局域网。 现场总线是应用在生产现场、在微机化测量控制设备之间实现双向串行多节点数字通信的系统，也被称为开放式、数字化、多点通信的底层控制网络。它在制造业、流程工业、交通、楼宇等方面的自动化系统中具有广泛的应用前景。 CAN已经形成国际标准，并已被公认为几种最有前途的现场总线之一。它属于总线式串行通讯网络，由于其采用了独特的多主工作方式、短帧结构、非破坏性总线仲裁以及校验检错措施，与一般的通信总线相比较，具有突出的可靠性、实时性和灵活性等特点，CAN已经被广泛用于汽车、火车、智能楼宇、机器人、消防管理、自动化仪表等领域。 在本课题“智能化门禁系统”中，由于采用了CAN现场总线技术，较好地解决了在低成本传输介质(双绞线)条件下传输距离、节点数量和传输时间之间的矛盾，达到了预期的目标。 本文共分五个部分，首先介绍了现场总线的发展、种类及其特点，然后详细介绍了CAN总线技术的特点，最后重点阐述了利用CAN总线技术具体实现的智能化门禁系统的关键技术和系统设计中应注意的事项。更多还原

【Abstract】 With the rapid development of information technology, the great changes have taken place in automatic system and information system of enterprises based on the automatic system of integrated network has gradually formed. PCS is a new technology complying with this tendency. FSC is one of hotspots in the field of automatic technology development, appraised as computer LAN in the domain of automatization.PCS is a system that is applied in the field of production to realize serially bi-directional multicast digital communication, also called open, digitized and multicast communication bottom layer control network, which has a wide prospect of application in automatic system in such fields as manufacturing, processing industry, communication, buildings and so on..CAN, an international standard, has general accepted as one of the most prosperous FCSo It belongs to asynchronous communication network. Compared with common communicative PCS, it is endowed with outstanding dependability, the property of real-time and flexibility because of more work, frame structure, bus access method and error tolerance technology . CAN has been adopted in the domain of automobile, train, intelligent buildings, automaton, fire-control management and automatic meter.hi this subject on intelligent gate system, the contradiction among transmission distance, quantity of node and transmission time under the condition of low-cost transmission media will be solved, so that the anticipative target will be achieved, thanks to the CAN technology.This article is divided into five sections, In the first section, the development, variety and characteristics of FCS will be introduced and the specialty of CAN technology will be detailedly mentioned in the following paragraph and in the last, the key technology in realizing intelligent gate system using CAN technology and the precautions in system design will be expatiated.更多还原