单片机多机无线通信系统

本文介绍了单片机串行通信的一种全新的物理接口技术－脉冲调制的无线通信接口,及该接口技术在单片机多机通信系统中的应用。／     

一种通用远程控制模块的实现和应用

在许多像计算机远程控制和数据采集这样的应用系统中，通信模块是必不可少的。实现它的模块化设计，能够极大地减轻系统的设计工作。结出了一个通用远程通信模块的电路设计和工作原理，接口时序和通信程序设计的软件流程。介绍了这种远程通信模块的应用。     

利用PC机控制多机分布式系统的设计与实现

本文设计了一种基于单 5V电源的,利用目PC机来实现对分布在不同地方的下位机进行统一管理的系统。本系统以动态编址的多机通信模块为实现目标,以实现系统规范性、实用性、可扩展性和模块化为设计宗旨,真正实现分散运行、集中管理的网络化管理。     

OPC技术在油田分布式共享系统中的应用

为了解决油田联合站内不同厂商监控组态软件之间的通信问题,采用OPC接口技术,设计了油田数据分布式共享系统,实现了相互独立的各联合站数据采集系统之间的通信以及网络客户端油田联合站数据的分布式共享。实际应用表明,该系统能够实时获取数据源的动态数据和历史数据,捕捉控制过程中的各种报警和事件,具有一定的推广价值。     

基于82530串行通信控制器实现多机串行通信

串行通信是主－从计算机控制系统中数据传输的主要方式。本文首先介绍８２５３０串行通信控制器的功能特点，随后探讨如何将其用于某化工过程控制中主控台计算机与多台下位机之间数据串行通信系统的实现。文中给出用Ｃ语言编程的通信实例。     

多机通信在电力负控管理系统中的实现

电力负控管理系统为我们科学用电、节约用电提供了一种有效管理手段。在该系统中，监控机负责运行负控管理软件以完成用电的监控管理；前置机运行通信软件，负责所有监控机与远程控电设备的通信。如何设计并实现监控机与前置机之间通信以完成整个电力管理系统的正常运转，已成为整个系统的核心技术之一。     

单片机串行通讯技术在数据采集系统中的应用

能够完成异步通信的硬件电路称为UART,即通用异步接收器/发送器(Universal Asynchronous Receiver/Transmitter),本文介绍了应用8051单片机一主机多从机组成的串行异步通讯接口技术进行数据采集,采用RS-485标准接口通信,其抗干扰能力强,可与32台从机通讯,传输距离可达1200m,最大传送速率1Mb/S.     

大型电控系统故障诊断装置的软件设计

为了解决大型机电设备电控系统故障诊断的难题，分析了采用模块化结构设计的电控系统故障诊断装置软件系统的结构与原理，软件在专家系统中成功地利用了多媒体技术，实现了工控机与单片机之间的通信，实践证明该软件系统解决了大型机电设备电控系统故障诊断的难题。     

单片机在波特率变换器中的应用

在一些复杂的系统中，系统与分系统、分系统与设备等之间存在数据的传递问题，往往采用通信的方式来解决。由于分系统、设备等通信波特率的不同，特别是一些特殊波特率设备的存在，使得系统中设备间的相互通信不易实现。例如，在一个系统中，上位机接收某一设备的数据，如图1所示，设备1和设备2采用的是172．8kbps的波特率，而上位机用VB编程，其通信波特率为115．2kbps、128kbps或256kbps等，这样设备之间就不能相互通信，给设计带来困难。为了解决上述问题，采用双单片机电路，设计了波特率变换器，将接收波特率为172．8kbps的数据，转换成波特率为115．2kbps的输出，从而使不同波特率设备之间的通信成为可能。     

面向对象通信协议的设计与实现

文章介绍了如何利用面向对象技术构建模块化通信系统，并给出了作者设计的TCP模块化实例。     

Assessing Ideational and Evaluative Skills and Creative Styles and Attitudes

This article describes the rationale for the multiphase creative problem solving process, and reports the findings from an empirical investigation conducted to facilitate the problem solving of managers. The ideational skills of the managers were assessed before and after training in a complete process of creative problem solving, along with their ideational attitudes, creative problem solving style (i.e., generator, conceptualizer, optimizer, or implementor), and evaluative skill (i.e., ability to recognize original ideas). The most important findings indicated that the training had a significant impact on the evaluative accuracy of the managers. They were significantly more accurate in their judgments about original ideas after training, both in their identification of original ideas and their recognition of unoriginal ideas. After training, the managers also gave more solutions and more original solutions to problems. Finally, several variables (e.g., the “preference for active divergence” attitude, and the conceptualizer process style) seemed to moderate the impact of training. Training was therefore effective, with specific effects that can be predicted from pre-training individual differences in attitudes and process style.     

Rank and select revisited and extended

The deep connection between the Burrows–Wheeler transform (BWT) and the so-called rank and select data structures for symbol sequences is the basis of most successful approaches to compressed text indexing. Rank of a symbol at a given position equals the number of times the symbol appears in the corresponding prefix of the sequence. Select is the inverse, retrieving the positions of the symbol occurrences. It has been shown that improvements to rank/select algorithms, in combination with the BWT, turn into improved compressed text indexes.     

Semantics and verification of monitors and systems of monitors and processes

In this paper we present a sound and complete semantics for the monitor concept of C.A.R. Hoare. First a method for specification of monitors, introduced by O.-J. Dahl, is reviewed. This method is based on the relation between the historic sequence of monitor procedure calls and the historic sequence of monitor procedure exits. Based on such specifications and our new monitor semantics we present a method by which it is possible to prove that a concrete monitor is an implementation of an abstract one. In the last part of the paper an axiomatic semantics for systems of concurrent processes and monitors is introduced. The method supports verification by separation of concerns: Properties of the communication to and from each process are proven in isolation by a usual Hoare style axiomatic semantics, while abstract monitors are also specified in isolation by the method reviewed in the first part of the paper. These properties of the components of the system are then used in a new proof rule to conclude properties of the complete system. Stein Gjessing received a Ph.D. (actually a Dr. philos.) from the University of Oslo (Norway) in 1985. Presently he is an Associate Professor at the Institute of informatics, University of Oslo, Norway. Dr. Gjessings research interests are in the area of concurrent and distributed programming, operating systems, formal specification and verification and programming languages.     

Integrating and automating analysis and optimization

The development of an interface coupling program on personal computers for an analysis software system such as ANSYS, SAP, etc. and an optimization software system, MOST, is presented. By controlling and directing the communications the interface coupler integrates the two programs while retaining their versatility and interactive features. The integrated system is used to solve a numerical example of active noise control for a three-dimensional enclosure, in which an energy density level of control points is minimized by adding the sound source to cancel the unwanted noise. The interface coupling program automates with relatively low cost the iterative process for designing an engineering system, remaining flexible in acoustical modelling and efficient in equation solving. Also, the coupling interface is developed in a general-purpose way so that it can be expanded easily to integrate more analysis software packages of different kinds.