LED显示屏的计算机远程控制系统 第2页
目录
中文摘要···································································································……I
英文摘要···································································································……111
1绪论·········································································································……1
1.1LED显示屏简介·················································，······················……‘二“‘”””1
1.2LED显示屏存在的问题以及发展·······························································……2
1.3LED显示屏远程控制系统········································································……3
1.4系统要进行研究的主要内容·····································································……4
1.4.1传统LED显示屏的研究··································································……””’““4
1.1.2;!算机收发软件设计一·····························································……“·‘””‘’‘”’“4
1.4.3接日板硬件电路研制··············································································……4
1.4.4接收单片机软件设计··········································································……‘二’4
1.4.5发送单片机软件设计··············································································……4
1.5各项研究的基本要求········，·························································，···········……4
1.5
.
1计竹
一
机收发软件功能要求········································································……4
1.5.2接口板接收单片机软件性能要求·······························································……5
1.5.3接口板发送单片机软件性能要求·······························································……5
1.5.4接日板硬件性能要求········································································……”‘”’5
1.6项目研究的的意义·················································································……5
2系统的硬件介绍·······················································································……7
2.1系统框图·····························································································……7
2.2调制解调器··························································································……7
2.2.1简介·····································，·····························································……7
2.2.2下作原理················，············································································……7
2
.
2.3调制解调器孚污用术语解释········································································……9
2
.
2
.
4常见的调制解调器指示灯含义··································································……n
2.2.5常用的AT标准指令·································································……”‘”””””12
2.2.6系统中调制解调器的主要功能··································································……巧
2.3微处理器··························，·······························································……巧
2.3.1微处理器的发展····················································································……15
2.3.2AT89C51单片机·························……‘·····························……‘””‘…’·16
2.4双口RAM·····························································································……19
2.4.1双口RAM的下作原理及特点·····································································……19
目录
2.4.2双口尺AMIDT7132SA芯片········································································……20
2.5串行数据收发器MAx232.··························································……‘…”‘”’“‘21
艺.5.1串行通信的}_作原理············································································……’·21
2.5.2MAX一232介绍，····················，·································································……22
3计算机软件设计·····················································……”·‘”””’“.”””’‘’‘”””’24
3.IRs一232引脚的定义···········································································……”’24
3.2计算机传送数据给调制解调器时序分析······················································……24
3.3计算机接收调制解调器传输数据时序分析..··············································……25
3.4软件开发工具vB概述·····································································……，’’…25
3.5软件开发总体设计·················································································……27
3.5.1用户界面设计·······················································································……27
3.5
.
2软件功能设计·······················································································……28
3.6软件流程图·······················································································……29
3.7软件操作过程······························……，!’·············································……29
3.8用VB编写的软件源代码········································································……30
4接口板硬件电路设计···········································································……35
4.1接口板硬件框图·················································································……35
4.2接口板电路图·······················································································……35
5接收微处理器软件设计·····································································……37
5.Ic语言与8051简介·················································································……37
5.2csl的数据与运算说明········································································……37
5.3软件功能设计······················································································……‘38
5.4软件流程图················，·········································································……38
5.5用C语言编写的软件源代码·····································································……39
5.6用汇编语言编写的软件·····················……，···········································……‘”‘41
6发送微处理器软件设计········································································……44
6.1软件功能设计····················································································……44
6.2软件流程图·，························································································……44
6.3用c语言编写的软件···································································……’·’··…”’45
6.4用汇编语言编写的软件，·····························································……”‘’‘二‘”46
7设计的扩展应用···，·············································································……”’48
结束语···········································································，·····························……50
参考文献·······，····················，·········································································……51
致谢············································································································……53
重庆大学硕士学位论文
1绪论
1.1LEO显示屏简介
LED显示屏系统川，主要由显示屏(含显示阵列，行、列驱动电路，电源)，显
示屏控制器和计算机(含录入管理软件)这三个主要部分组成。可以实现视频、音频、
数据及其它信息接收、存储、管理和最终的显示播放。主要功能是再现图文声音和视
频信息。‘己是集光、电、声为一体的新型广告媒体。它采用先进的多媒体技术和相
应的软件，可以通过计算机键盘、扫描仪、录像机、摄像机等输入中西文字，图形视
频图像等。由计算机发出的信息和控制信号，通过控制器和行列驱动电路，控制发光
二极管的亮暗状态，从而在显示阵面上显示出多色，多灰度生动活泼的绚丽多彩的各
种画面。
IED显示屏是作为广播、电视、报纸、杂志之后的又一新传播媒体。目前在商场、
厂‘场、体育馆、车站、码头、航空港、医院、银行、证券期货交易所、电视台的演播
室、人型企业形象宣传牌、监控中心等处都有日益广泛的应用。LED显示屏根据使用
场所可以分为室外屏和室内屏两种，其主要区别是发光管的发光亮度不同。而根据所
显不的内容则也可以分为图像屏和文字屏两种，图像屏可以显示图象以及多媒体，而
文字屏则主要显示文字，也可以显示简单的固定图像，有单色和三色两种。显示图像
的多媒体室外屏是投资巨大(高达数百万)的大型高档设备，主要应用在大型公共场
所、形象工程和一些重要场所。
LED室外全彩色显示系统由红、绿、蓝三原色组成，可显示自然界所有颜色，在
阳光照射下，屏幕能够显示清晰的图像。室外系统采用功能强大的多媒体技术，可实
时播放电视或录像，不仅能显示各种图像文字，而且能将二文或者三文电脑动画与视
频相叠加，适用于商业区、展览中心、体育场馆、娱乐中心、商场、车站、航空港、
码头等处的信息显示和广告宣传。其特点为:电耗低、寿命长、全天候，可在任何地
点安置。室内LED显示系统也能实现视频、声音、新闻及其他信息的接收、存储、管
理和最终播放，是一种全新的户内传播媒体。系统可以将电视、录像、影碟及计算机
图像等多种不同类型媒体的内容作为播放的节目信息源，具有简单方便和直观演示播
放的特点，‘已适用于商场、车站、空港码头、大型宾馆、会议中心、展览中心、证券
等处的室内商业广告和各种信息的显示和宣传。由于该场所主要以文字显示为主，所
有以文字屏为主，这也是我们所见到最多的LED显示屏，由于其屏幕面积较大，有时
也称其为LED大屏幕显示系统。其系统原理图如图1.1所示〔21。
系统中控制器中的单片机通过RS~485/RS一232接收由上位机(计算机)传入的显
示信息和控制信息，该信息经处理后，写入显示用的RAM(或双口RAM)进行储存，当
重庆大学硕十学位论文
显不系统正常运行时，系统可以将RAM的内容读出，根据内容控制各个控制信号，
一并送入LED显示屏体进行显示，通过各个发光二极管的亮暗实现完整的信息显示。
在系统中单片机控制采集数据并存贮数据到双口RAM系统。
存存储器器
RRRS一23222222222系统控制制
尸尸尸‘‘单片机机
计计算机机
显示用的双
RAM系统
高速扫描信号发生器
控制器与
LDE板接
口
LED显示阵列
图1.1显示屏显示系统示意图
F1911ThedisPlaysereenshowsthesketchmaPsystematically
.
2LEO显示屏存在的问题以及发展
尽管目前LED显示屏的应用范围越来越广，但是在应用中也暴露出一些新的问
题，如内容更新必须要计算机完成:作为控制的计算机离LED屏幕距离有一定的距离
(一般不超过10米)限制;每台计算机一般只能控制一台LED显示屏。这一切都极
大的限制了L印的显示屏的发展。如果用户要求远程控制或多台控制则就更难实现。
除此之外，由于每个系统中必须有一台计算机进行控制，这使得系统的单体投资比较
大，文护管理费用也比较高，这一切都极大的制约了LED显示屏的发展。
匡!内外的!巨O生产厂家对远程控制这一需求也进行了研究，也提出了一些解决方
案，但是在实际运行中都有一定的限制，如有的生产厂家将互联网技术引入远程传输，
既每个LED显示屏还采取的是原来的计算机系统，但是计算机与互联网相连，通过互
联网实现与远程计算机进行数据交流，这种方法从原理上可以实现，但是在实际使用
上还有很大的差距，如对客户的每个LED显示屏都要求与互联网相连接，就目前国内
大多数地区互联网接入还是以拨号上网的方式与互联网相连接，宽带上网还只在小部
分区域。从运行管理
_
卜这种远程控制方式并不能解决现场上不用计算机设备这一功
能，因此日常运行管理费用比原来的还高，因此这这种方法实际使用的很少。
从L山显小屏的而求上，市场上不仅需要像大屏幕的这样大型的显示屏，也需要
根据不同场地配置不同规格的小型显示屏。但是由于LED显示屏无论大型还是小型，
其最小系统的三大组成部分不能改变，而对于三部分中占投资比重较大的计算机实际
利用率并不高，仅在内容更新时才与LED显示屏相连接，如果能将计算机去掉或多台
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