基于C++Builder的PC机与单片机串口通信的实现

串口通信是人体重心实时监控软件的主要功能之一.介绍了串口通信协议的设计,研究了在C++ Builder环境下如何利用API函数开发上位机的通信程序,从而实现PC机与单片机的串口通信.经过试验测试和实际运行,通信程序能够准确、快速地完成通信任务.     

用VC++实现ABB工业控制系统与上位机的通信

介绍了串口通信以及ABB Master EXCOM通信协议，阐述了外部计算机通过EXCOM访问Master Piece200／1主机数据库的方法以及两者之间的数据传输方式和消息格式。使用VC＋＋编程实现了上位机和ABB工业控制系统的串口通信，实时地采集现场的生产数据，并将数据写入位于远程Linux服务器上的Mysql数据库，为系统下一步对高速线材的控冷程序进行优化做好了准备。系统稳定可靠、运行效果良好，对其他工业控制系统与上位机的串口通信具有一定的借鉴意义。     

多线程串口通信在闭气塞检测系统中的应用

针对单线程进程机制通信开销大,系统工作效率低的问题,利用多线程技术和Windows API函数,开发设计了上位机的串行通信程序;根据PLC自由端口模式,设计了PLC的串口通信程序,从而实现了闭气塞自动检测装置中PLC和PC之间的通信.系统运行表明:基于自由口通信方式的上位机 PLC的自动检测控制系统,引入多线程后,检测效率明显提高,且性能稳定,可靠性高.     

基于Proteus虚拟环境单片机与PC串口通信

Proteus虚拟环境提供的COMPIM组件,可用来设置单片机串口通信协议,使虚拟环境与实际PC通信成为可能。对于没有物理串口的PC机,可借助VSPD虚拟串口软件构建PC虚拟串口,仅用一台PC机就可实现单片机系统与PC串口通信。根据单片机串口通信的特点,提出了单片机与PC串口通信的结构模型,即应用层、数据链路层和物理层三层结构,探讨了串口通信结构模型与通信方式之间的关系。在Proteus环境中以虚拟串口为例,设计了硬件电路和通信程序、给出了串口通信程序流程图,在一台PC机上实现了单片机与PC串口通信。     

S7-200系列PLC自由口模式下实时通信技术研究

在实际工业控制系统应用环境中,研究PLC自由口模式的通信有助于实现PLC与Windows程序开发环境间的实时通信。通过研究PLC自由口模式的通信,系统实现了C Builder6.0与PLC的实时通信,从而实现工业控制系统中上下位机的通信,将由PLC采集的的数据进行实时显示和控制,并将数据以数据库的形式存储起来以便研究和分析。     

Windows2000下串口通信在污水处理控制系统的应用

污水处理集用控制系统由上位机（PC）和下位机（PLC）构成，PC与PLC之间必须进行数据通信。讨论了基于Windows2000的API函数开发串口通信程序和基于微软公司提供的ActivesX通信控件Communications开发串口通信程序的方法；利用VisualC＋＋6．0集成开发环境开发了PC与PLC串行通信程序。据此所产生的程序代码较之其它方法或语言所产生的代码，运行效率要高得多。     

S7-200系列PLC自由口模式下实时通信技术研究

在实际工业控制系统应用环境中，研究PLC自由口模式的通信有助于实现PLC与Windows程序开发环境间的实时通信。通过研究PLC自由口模式的通信，系统实现了C＋＋ Builder6．0与PLC的实时通信，从而实现工业控制系统中上下位机的通信，将由PLC采集的的数据进行实时显示和控制，并将数据以数据库的形式存储起来以便研究和分析。     

MSCOMM与API函数实现PLC串口通信比较

主要针对可编程控制器(PLC)在工业控制中应用需要,通过串口通信实现可编程控制器与PC(上位机)之间数据传输,在工业自动化控制中具有很重要意义.分别采用API函数和MSCOMM控件来实现串口通信,并且在实现时间以及执行效率上进行比较,通过比较可以清楚地了解两者的性能,从而可以根据不同的需求,选择不同的方法实现.     

Delphi环境中利用MSCOMM实现PLC与上位机的串口通信

本文在Delphi环境下利用MSCOMM控件,开发设计了上位机的串行通信程序;根据S7-200系列PLC的自由通讯口方式,设计了PLC的串口通信程序,从而实现了上位机与S7-200系列PLC的通信,对水厂自动供水系统进行实时设备监控与信息管理。经过试验测试和实际运行,通信模块能够准确、快速的完成通信任务。     

混合纠错在CAPS数据采集系统中的应用

分析了一种基于CRC校验的混合纠错HEC方式在FPGA和PC机串口通信中的具体实现方法,并将其应用到CAPS精码实时串口数据采集系统中,结合工程实践提出了一种FPGA和PC机之间串口实时数据采集的可靠通信模型,实现了稳定可靠的串口通信,满足了实时数据采集任务要求。     

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.     

View-based model-driven architecture for enhancing maintainability of data access services

In modern service-oriented architectures, database access is done by a special type of services, the so-called data access services (DAS). Though, particularly in data-intensive applications, using and developing DAS are very common today, the link between the DAS and their implementation, e.g. a layer of data access objects (DAOs) encapsulating the database queries, still is not sufficiently elaborated, yet. As a result, as the number of DAS grows, finding the desired DAS for reuse and/or associated documentation can become an impossible task. In this paper we focus on bridging this gap between the DAS and their implementation by presenting a view-based, model-driven data access architecture (VMDA) managing models of the DAS, DAOs and database queries in a queryable manner. Our models support tailored views of different stakeholders and are scalable with all types of DAS implementations. In this paper we show that our view-based and model driven architecture approach can enhance software development productivity and maintainability by improving DAS documentation. Moreover, our VMDA opens a wide range of applications such as evaluating DAS usage for DAS performance optimization. Furthermore, we provide tool support and illustrate the applicability of our VMDA in a large-scale case study. Finally, we quantitatively prove that our approach performs with acceptable response times.     

A pragmatic multi-method investigation of discrepant technological events: Coping,attributions, and ‘accidental’ learning

Discrepant technological events or situations that entail a problem, a misunderstanding or a difficulty with the Information Technology (IT) being employed, are common in the workplace, and can lead to frustration and avoidance behaviors. Little is known, however, about how individuals cope with these events. This paper examines these events by using a multi-method pragmatic approach informed by coping theory. The results of two studies – a critical incident study and an experiment – serve to build and test, respectively, a theoretical model that posits that individuals use a variety of strategies when dealing with these events: they experience negative emotions, make external attributions, and adopt engagement coping strategies directed at solving the event, eventually switching to a disengagement coping strategy when they feel they have no control over the situation. Furthermore, users’ efforts may result in ‘accidental’ learning as they try to overcome the discrepant IT events through engagement coping. The paper ends with a discussion of the results in light of existing literature, future opportunities for research, and implications for practice.     

The Distributed Time-Triggered Simulation Scheme: Core Principles and Supporting Execution Engine

Distributed real-time simulation is a young technology field but its practice is under increasing demands. In recent years the author and his collaborators have been establishing a new approach called the distributed time-triggered simulation (DTS) scheme which is conceptually simple and easy to use but widely applicable. The concept was initiated in the course of developing a new-generation object-oriented real-time programming scheme called the time-triggered message-triggered object (TMO) programming scheme. Some fundamental issues inherent in distributed real-time simulation that were learned during recent experimental studies are discussed along with some approaches for resolving the issues. An execution engine developed to support both the TMOs engaged in control computation and the TMOs engaged in DTS is also discussed along with its possible extensions that will enable significantly larger-scale DTSs.     

Software-Konfigurationsmanagement in großen Softwareprojekten

Zusammenfassung Mit zunehmender Größe der Softwaresysteme verschärfen sich die für die Software-Herstellung typischen Probleme: Beherrschen großer Objektmengen, Erhalten der Systemkonsistenz, Kontrolle der ständigen Änderungseinflüsse und Gewährleisten einer langen Lebensdauer. Die Disziplin Konfigurationsmanagement bildet den methodischen Ansatz, diese Probleme besser zu beherrschen. Software-Konfigurationsmanagement faßt die Herstellung von Softwaresystemen als eine Abfolge von kontrollierten Änderungen an gesicherten Zwischen- und Endergebnissen auf. Dargestellt werden die Objekte und Funktionen des Software-Konfigurationsmanagements sowie die hierfür in großen Software-Projekten benötigten Methoden, Instanzen und Hilfsmittel.     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and     

Editorial:Brain-machine interface(BMI) and cyborg intelligence

正Brain-machine interfaces(BMIs)aim at building a direct communication pathway between the brain and an external device,and represent an area of research where significant progress has been made during the past decade.Based on BMIs,mind information can be read out by neural signals to control     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate     

SCIENCE CHINA Information Sciences SUBJECT INDEX TO VOLUME 57(2014)

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Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate