基于AT89S52的Profibus-DP从站的设计与实现

自2006年Profibus现场总线成为我国现场总线的国家标准(GB/T 20540-2006)以来,Profibus-DP从站的开发已逐渐成为当今工业自动化控制及仪表领域的研究热点.针对该热点讨论了采用AT89S52和协议芯片SPC3设计了Profihus-DP从站,分别从Profi-bus-DP从站的硬件设计、软件设计和组网调试三方面展开较详细的讨论,并进行了组网调试.结果表明,该从站能够稳定可靠地运行,有力地促进了Profibus-DP现场总线的推广应用.     

基于Profibus-DP的智能从站接口设计与应用

为了解决当前一些智能设备无法与现场总线系统进行通信的问题,对Profibus-DP总线协议进行了分析,提出了一种以微控制器与Profibus协议芯片作为核心器件的从站接口设计方案。采用ATMEGA162单片机来处理用户程序,由VPC3+C芯片实现Profibus-DP协议,通过RS485驱动芯片ADM2486与RS232串口电平转换芯片MAX232,完成Profibus-DP总线协议与RS232串口协议之间的转换,实现RS232智能设备与现场总线的连接。已在产品跟踪系统中应用,使用结果表明,从站接口在保证智能设备与现场总线通信稳定可靠的情况下,提高了数据交换的传输速率。     

基于PROFIBUS-DP的黑液浓度软测量智能从站

介绍了利用西门子SPC3现场总线接口芯版和单片机AT89S52,并结合数据拟合技术建立软测量模型.构成基于PROFIBUS-DP的黑液浓度软测量智能从站;并详细描述了PROFIBUS-DP从站状态机和智能从站的调试过程.     

基于现场总线的模糊控制系统

基于现场总线控制技术,介绍了模糊控制系统的设计方法。采用双单片机AT89S52与AT90S8515设计了基于PA总线接口的回转窑温度智能模糊测控系统。利用ASIC芯片SPC4、SIM1设计了Profibus-PA总线通信接口和回转窑温度检测接口硬件电路,给出了总线通信接口程序流程图。应用结果表明,系统通信可靠、控制效果好。     

称重仪表的模块化及网络化设计

针对称重仪表的发展趋势,该文设计一种模块化、网络化的称重仪表。该仪表采用双处理器(MSP430F147结合AT89C52)实现模块化设计,包含模拟量采集与控制、VFD(真空荧光显示屏)显示、Ethernet接口、IO扩展及电源五个模块。其中Ethernet接口模块采用通用型串口以太网转换设备,方便仪表接入Internet。实验测试表明该仪表运行稳定可靠,使用方便灵活,功能强大多样。     

基于现场总线的万能式断路器通信从站设计

针对Profibus-DP现场总线和万能式断路器控制器技术要求,给出了一种基于Profibus-DP现场总线的断路器智能通信从站设计方案。阐述了信号采集电路、温度检测与实时时钟电路、Profibus-DP总线通信接口模块和万能式断路器控制器用户模块之间通信转换的硬件和软件的设计方法以及Profibus-DP总线通信的主要技术指标。对Profibus这种接口模块的物理层、数据链路层及具体的硬件连接和软件设计都作了较详细的阐述,为以后实现模块组态、设备互连以及设备管理等功能的现场总线系统铺平了道路。     

基于Profibus-DP的断路器多参数测控系统设计

本文针对Profibus-DP现场总线和智能低压断路器控制器技术要求，给出了一种基于Profibus-DP现场总线的智能断路器多参数测控系统设计方案，阐述了信号采集电路、温度检测与实时时钟电路、Profibus-DP总线接口模块硬件和软件的设计方法，以及多参数测控软件的算法和设计。     

Profibus—DP智能温度控制器从站设计

介绍利用AT89S52单片机与西门子DP协议芯片SPC3及一些外围的扩展芯片设计了Profibus-DP智能温度控制器从站,给出了软硬件设计方法,实现了对模拟工业炉的温度控制。     

基于控制网络的多协议通信适配器的设计

随着控制网络的发展,越来越多的具有不同串口接口的现场设备需要与不同协议的总线进行通信的问题日益凸显,该设计以W78E58B单片机为主控制器,以CAN控制器SA1000与PCA82C250作为CAN总线接口模块,以Profibus专用智能协议芯片SPC3组成Profibus-DP总线接口模块,以MAX3162作为串口RS232/RS485/RS422电平转换芯片,设计了集成CAN总线与Profibus-DP总线到RS232/RS485/RS422串口接口的多协议通信适配器,并对其硬件电路与软件进行了设计.该装置能够实现具有任何一种标准接口RS485\RS232\RS422的工业现场设备到任何一种现场总线Profibus-DP总线、CAN总线的通信任务.实际证明该装置运行稳定、可靠.     

基于Profibus-DP现场总线的计量泵群控系统

Profibus-DP现场总线是分布式系统减少I/O连接和布线数量的理想解决方案,针对现场总线的应用和发展现状,采用协议芯片SPC3与MC9S12C微控制器,设计了基于Profibus-DP的计量泵群控系统。主要介绍了Profibus-DP硬件接口电路硬件设计以及软件实现SPC3与微处理器MC9S12C的通信及其数据交换。最终利用Profibus-DP总线实现了计量泵分布式控制的目的,为工业现场设备级组网提供了合理的依据,并促进了Profibus-DP现场总线的推广应用。     

Only connect: teaching, technology and telesis

Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.     

European Community policy and the market

Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.     

一种自适应子融合集成多分类器方法

融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。     

煤矿井下安全监控分站的设计及其仿真实现

为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.     

Avoiding semantic and temporal gaps in developing software intensive systems

Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.     

基于QTE的蒙古文显示机制研究与实现

蒙古语言是中国蒙古族使用的通用语言,由于蒙古文区别于其他文字的书写方式和其自身变形机制等特点,在很多通用的文字处理引擎中都不被支持。在嵌入式产品开发与应用领域中Linux加QTE已经成为流行方式。该文给出了一种在QTE环境上实现基于标准Unicode的蒙古文点阵显示和变形算法, 并自定义了支持蒙古文的QTE组件,扩展了QTE功能,为在Linux加QTE方式的嵌入式体系结构中处理蒙古文提供了一种解决方法。     

Designing economic np control charts: A programmed simulation approach

This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.     

基于AD9626的模拟信号采集存储卡设计

自然界的绝大部分信号都是以模拟的形式存在,因此模拟信号的采集转换存储在数字时代十分关键。文章讨论了在雷达信号处理领域基于AD9626的AD采集存储卡的设计原理、硬件结构和程序设计与芯片配置等问题,为今后相关领域的研究提供了可参考的方案。     

The development of robot art

Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008     

A human-computer interface for non-computer specialists

The COM teleconferencing system was designed to be easy to use for both beginners and people with much computer experience. A number of design choices in organizing the human-computer interface were considered very carefully. These design problems are not unique for teleconferencing applications, but will appear in many other developments of human-computer interfaces for non-computer specialists. This report discusses naming conventions, menu format, user commands, help facility and the treatment of ‘type ahead’ from the users.