ARM和WinCE环境下的Modbus协议的实现

工业控制中,对由一主机和若干从机所构成的网络,可以采用Modbus协议实现主从之间的信息传递;在实现主从通信的基础上,提高信息交换的准确性和速率显得十分必要;通过定制WinCE操作系统和串口驱动编程,分析Modbus RTU通信协议的原理,并设计Modbus RTU通信协议的主机和从机通信的程序包,实现了将Modbus协议移植到Samsung S3C2440嵌入式处理器上;结果表明,在ARM设备和WinCE环境下实现Modbus通信协议是可行的,这为实时高效地实现主从对话提供了依据.     

基于C#的Modbus协议的实现与应用

针对目前检测控制领域,数据分散和通信协议不统一的问题,采用通用工业标准Modbus协议,在.NET3.5框架下,基于C#编程语言,设计一套主从式通信检测系统,实现数据集散控制。该设计实现模块化、高内聚低耦合,易于开发运用;详细阐述工控机与嵌入式微机、程控电源HSPY3603基于Modbus RTU串行通信的设计实现,成功应用于某高压电源检测系统软件。经测试验证,主从设备间串口通信稳定可靠,解决多协议数据分散管理问题,为实时检测控制现场提供可行性方案。     

协议宏在分布式供能系统中的应用

介绍了在天然气分布式供能系统中,用来实现燃机(MT250)和控制系统(Omron PLC)之间通信的Modbus协议宏.重点阐述了Modbus RTU通信协议的定义格式、Omron协议宏转化软件的通信配置方式以及地址映射等内容.由此得出通过协议转化,可对燃机的转速、功率因数、温度等运行参数进行监视和控制.协议宏的应用使分布式供能系统运行稳定、实时性高,对同类工业应用具有一定的参考价值.     

基于Modbus RTU协议的ProConOS I/O驱动设计

介绍了Modbus RTU通信协议的特点,提出了一种基于Modbus RTU协议的可编程逻辑控制内核软件ProConOS的I/O驱动设计方案,并进行了测试与分析。测试和应用结果表明,该方案能有效实现支持Modbus RTU协议的不同控制设备的互连互通、工业组网和集中控制,为Modbus RTU协议在嵌入式系统中的运用提供了依据。     

基于RTU油井远程测控系统的数据采集与传输层软件设计

提出了一种基于RTU油井远程测控系统的数据采集和传输层软件设计方案。介绍了实现各种传感器的数据采集、传输以及外部继电器控制的软件设计方法,并对实现Modbus/RTU和Modbus/TCP的通信进行了详细分析。分析结果显示:通过软件配置,可实现多种工作方式,有利于该系统在不同场合下的应用。     

BB RTU与Siemens PLC之间的数据通讯

以美国BB（Bristol Babcock）公司的RTU系统（Remote Terminal Unit,远程终端设备,简称RTU）和西门子S7系统通信为例,介绍了Modbus协议的特点和应用过程,介绍了RTU与Siemens PLC（西门子可编程逻辑控制器）之间Modbus通信的实现。对美国BB RTU与Siemens PLC之间Modbus通信两系统硬件设置、软件组态以及调试方面作了较为详细的介绍。该系统已投入运行后,稳定可靠,具有良好的应用和推广价值。     

基于RS485总线和Modbus RTU通讯协议的液位监测系统

针对非接触式液位检测,设计了一套适用于工业生产的液位检测系统。该系统采用Modbus RTU协议,采用RS485与上位机进行通信。首先进行了系统方案设计,在分析RS485和Modbus协议相关性能基础上,进行了软件设计,并给出部分设计代码。实际工程应用表明,该系统能够稳定运行。     

基于Modbus 协议的智能断路器通信模块设计与实现

针对可通信智能断路器的技术发展要求,介绍一种基于Modbus协议的智能断路器通信模块设计方案。阐述了系统的组网形式、Modbus协议通信机制以及Modbus协议栈的软件实现方法。给出了电源电路、RS485通信接口电路的设计方案。该模块有效的实现了智能断路器的远程通信和集中监控。     

S7-300 PLC与设备进行Modbus RTU通信方法

给出S7-300PLC与设备通过Modbus RTU协议进行通信连接的方法,以及硬件组态步骤、软件设计方法和要点.该方法可广泛应用于过程控制与数据采集系统,具有简单、方便等优点.     

基于西门子lPC串口的Modbus通迅设计与应用

Modbus协议作为一种开放的协议标准已经广泛应用于电能监测仪表系统中。在深入研究分析Modbus RTU协议的基础上,设计了利用西门子lPC427串口读取Modbus RTU数据的方法,解决了lPC427C自身不支持Modbus RTU协议的缺陷,并得到了良好的应用。     

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。     

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.     

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.     

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     

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.     

Explanation and prediction: an architecture for default and abductive reasoning

Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.     

Three Process Perspectives: Organizations, Teams, and People

This paper provides the author's personal views and perspectives on software process improvement. Starting with his first work on technology assessment in IBM over 20 years ago, Watts Humphrey describes the process improvement work he has been directly involved in. This includes the development of the early process assessment methods, the original design of the CMM, and the introduction of the Personal Software Process (PSP)^SM and Team Software Process (TSP){^SM}. In addition to describing the original motivation for this work, the author also reviews many of the problems he and his associates encountered and why they solved them the way they did. He also comments on the outstanding issues and likely directions for future work. Finally, this work has built on the experiences and contributions of many people. Mr. Humphrey only describes work that he was personally involved in and he names many of the key contributors. However, so many people have been involved in this work that a full list of the important participants would be impractical.     

基于复小波噪声方差显著修正的SAR图像去噪

提出了一种基于复小波域统计建模与噪声方差估计显著性修正相结合的合成孔径雷达(Synthetic Aperture Radar,SAR)图像斑点噪声滤波方法。该方法首先通过对数变换将乘性噪声模型转化为加性噪声模型,然后对变换后的图像进行双树复小波变换(Dualtree Complex Wavelet Transform,DCWT),并对复数小波系数的统计分布进行建模。在此先验分布的基础上,通过运用贝叶斯估计方法从含噪系数中恢复原始系数,达到滤除噪声的目的。实验结果表明该方法在去除噪声的同时保留了图像的细节信息,取得了很好的降噪效果。