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Modbus协议的S7-200 PLC与矿用智能遥控接收机的通信

介绍了Modbus协议的特点,分析了S7-200 PLC Modbus RTU主站协议库,确定了采掘设备控制器S7-200 PLC与矿用智能遥控接收机的数据通信采用Modbus RTU协议,实现了采掘设备与遥控装置的双向通信。应用结果表明,以S7-200 PLC为主站的Modbus通信,传输数据准确可靠,效果良好。     

基于Modbus RTU的串口调试软件的实现

文中介绍了Madbus RTU通讯协议的特点,阐述了该协议在VC2005编程环境下串口调试软件的具体实现方法.并编制了相关的程序,该程序采用了模块化思想,结构清晰,操作简便,实现了良好的Modbus RTU报文储存及管理机制,使用多线程兼顾界面显示和数据通讯,完全兼容Modbus RTU通讯协议,可用于自定义功能码的Modbus兼容设备的调试,克服了普通Modbus调试软件仅能用于Modbus标准功能码调试的不足.实践证明,该程序编制思想合理、运行稳定、操作简便易行,为工业自动化中Modbus设备的调试带来方便.     

Siemens CP340模块实现Modbus RTU协议的研究

本文介绍了Siemens CP340模块和Modbus RTU协议,并详细讲述了用CP340模块实现Modbus RTU协议的方法．给出了设计思路和软件编程、应用证明CP340模块在和其它设备采用这种协议通讯时稳定可靠,这种协议转换方法很适合控制现场使用。     

嵌入式Modbus TCP通讯模块设计

本文迎合PLC应用网络化发展的需求,提出一种基于嵌入式的Modbus RTU转Modbus TCP协议转化的通讯模块设计方法。该设计能简单、低成本、便捷、可靠的把现有支持Modbus RTU协议的PLC应用于以太网互联。     

通用串口到Modbus RTU的协议转换器设计与实现

为了实现RS-232/485通用串口设备接入Modbus总线,设计了一种通用串口到Modbus RTU的协议转换器,以IAP12C5A60S2单片机为主控制器;介绍了硬件结构和电路实现方法,结合Modbus RTU协议规范提出了软件设计思想,分析协议转换关键问题并给出了解决办法;最后,采用串口调试工具STC-ISP和RCP-972仪表对协议转换器进行测试和分析,结果表明主设备发出命令帧后100 ms内收到协议转换器回传的数据帧,协议转换器能够正确实现协议转换和报文转发功能。     

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。     

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.     

Modbus协议在油田采油监测系统的应用

本文介绍了使用工业现场的Modbus总线协议在油田采油监测系统中的具体应用。阐述了Modbus协议中RTU传输模式的定义、数据格式及实现方法。介绍了油田采油监测系统的硬件组成及下位机设备的软件流程。     

Experion PKS与RTU、ESD通讯的实现

以塔里木油田迪那2气田为例,从Experion PKS与RTU、ESD的系统结构、硬件及软件组成情况入手,重点介绍了基于Modbus协议Experion PKS与RTU、ESD之间通讯的实现过程。     

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     

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。     

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。