智能家居网络的串口通讯实现方案

目的 提出一种智能家庭网关与信息家电之间的串口通讯方案，设计一套基于RS-232的串口通讯协议。方法针对嵌入式系统在智能家居系统中的应用特点，参考电子控制领域通用的Modbus协议，并用C语言编制相应的串口通讯软件。结果建立了基于RS-232的串口通讯模型，实现了智能家庭网关与模拟节点之间的相互通讯。结论该智能家居网络的串口通讯方案是完全可行的。     

串口通信技术

串口通信是单片机芯片和外部设备进行数据交换、控制的必要途径.文章介绍了串口通信的相关概念,提供了串口通信的几种方法,主要介绍在Windows环境下通过MSComm控件实现的方法.     

一种新型串口速率自适应的算法与实现

在控制和通信领域中,经常需要将不同的仪器/设备的串口和控制平台及计算机进行互联,以实现对设备的控制、管理以及数据的共享.但在实际应用中,串口的速率以及通信格式不同,需要人工设置,不能够实现速率的自动检测和适应的功能.提出了一种新型的串行接口波特率自适应算法来实时检测接收到的波特率.本算法比其他现有的算法更简单、更快,性能更好,有效地解决了现有自适应算法局限性大、实时性差、判决时间长、适应时延大及使用不方便等问题.在算法实现中采用Verilog硬件描述语言和有限状态机,设计简单,灵活,可移植性强.     

基于DCOM的串口组件开发技术

DCOM技术是微软的分布式应用框架的重要基础之一,可以解决在工程应用过程中主机无法直接与串口设备连接的问题.在详细研究DCOM 技术特点基础上,开发了基于DCOM的串口组件,实现了对远程串口设备的访问.     

51系列单片机多串口通讯任务的实现

在51系列单片机系统应用日益广泛的今天，数据通讯是单片机实现自动化控制的主要方式之一。而串口通讯又是单片机的主要通讯方式，然而传统51单片机的串口已很难满足当今高速、多串口通讯的应用要求，因此寻找一种新的串口通讯方式就显得尤为重要了。本文就如何利用51汇编语言来实现软件模拟串口进行分析和讨论。     

串口总线电路的防护设计

阐述了串口总线电路的防护设计方法,主要对防止串口总线电路吊死的逻辑设计原理进行了较详细的阐述,分析了现有的串口总线电路设计中存在的缺陷,并提出一种通过逻辑控制来实现的串口防护设计方案.该方案实现简单、可靠性高,可广泛应用于各系统的串口总线电路中.     

基于C#的多串口通信策略的研究与实现

针对多路通信、数据采集等领域,上位机自带串口数量无法满足多串口通信需求的问题,在系统介绍串口通信技术的基础上,结合一机多秤称重管理系统,采用4232A多串口扩展器,以C#为开发语言,利用MSComm控件,实现了多串口通信和数据管理功能,提高了数据采集的实时性和准确性,为多串口应用系统提供了有效的解决方案.     

MSComm控件在VC＋＋6.0串口通信中的应用

通过对几种常用的串口通信方法进行分析比较,着重讨论了VC＋＋6.0环境下利用MSComm控件实现PC机与PC机间串口通信的方法,研究了利用MSComm控件实现串口通信的关键技术问题,并通过一个实例给出了MSComm控件在VC＋＋6.0串口通信中的应用。     

PowerBuilder编程中的串口通信技术

为实现PowerBuilder与外设之间的串口通信,提出了一种利用Windows API函数和线程技术实现串口通信的可行方法.并介绍了PowerBuilder、API函数和线程的特点,给出进行串口通信的具体实现步骤与通信程序的主要代码.此方法在实际应用中通信可靠、稳定,还可以拓展PowerBuilder的应用范围.     

计算机串口通信程序设计

在当前的各种实时监控系统和通信系统中,串口通信是应用最为广泛的通信方式之一,基本上各种下位机都支持串口通信,在大多数系统设计时串口通信部分的功能是类似的.以实现这些功能为主线,探讨了在具体设计时所需要注意的问题.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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