2016基于can总线的远程数据.doc

题目：基于CAN总线的远程数据采集系统--下位机部分内蒙古科技大学毕业设计说明书（毕业论文）基于CAN总线的远程数据采集系统--下位机部分摘要CAN总线作为一种有效支持分布式控制和实时控制的技术，以其稳定性好、可靠性高、抗干扰能力强、通讯速率高、维护成本低及其独特的设计越来越受到人们的重视，并被公认为是最有前途的现场总线之一。基于CAN总线的远程数据采集系统分为上位机、CAN总线和下位机三个部分。上位机建立友好的人机交互界面；CAN总线采用总线型拓扑结构，通信电缆采用双绞线；下位机部分是两个传感器节点。本论文重点介绍了下位机传感器节点的设计。首先介绍了系统总体设计方案，然后对温度传感器节点使用的K型热电偶、温度传感器AD590和压力传感器节点使用的MPX53DP做简要介绍，并分析设计放大电路；接着介绍单片机AT89C52及其附属电路，特别对键盘做了重点分析介绍；分析软件算法，使用C51语言编程；最后介绍系统调试。本设计实现了下位机对现场温度信号和压力信号的采集，通过键盘在线更改测量范围、报警值等参数。关键词：CAN总线；数据采集；下位机；AT89C52单片机TheLong-distanceDataCollectionBasedonCANBus--TheLowerComputerAbstractCANbustechnology,whichefficientlysupportsdistributedreal-timewithaveryhighlevelofsecurity,attractattentionwithaveryhighlevelofcapability.CANbushassomeadvantagessuchashighlevelofsecurity,stronganti-interference,highcommunicationspeedandlowofmaintenancecost.Itisaparticulardesign,anditisregardedafield-buswithexpansibility.Thelong-distancedatacollectionbasedonCANbusisdividedintothreeparts:uppercomputerandCANbusandlowercomputer.TheuppercomputerisestablishedfriendlyHuman-MachineInterface.CANbususesbustopologystructure,anduseUTPcablecommunications.Thelowercomputerusestwosensornodes.Thispaper’semphasisistointroducethedesignofthelowercomputersensornode.Thisdesignfirstlyintroducedthesystemoverallprojectdesign.ItintroducedbrieflytheK-thermocouplewhichusestemperaturesensornode,andtheMPX53DPwhichusestemperaturesensorAD590andpressuresensornode.Itanalyzedthedesignenlargementelectriccircuit.ItalsointroducedAT89C52MCUanditssubsidiarycircuit,especiallyfocusedonanalyzingthekeyboard.Thenitanalyzedsoftwarealgorithm,andusedtheC51languageforitsprogramming.Itintroducedthesystemdebuggingfinally.Thisdesignhasrealizedthelowercomputertothescenetemperaturesignalandpressuresignalcollection;throughthekeyboarditcanchangeonlinemeasurementrangeandalarmsandsoon.Keywords:CANbus;datacollection;lowercomputer;AT89C52MCU目录TOC\o"1-3"\h\z\uHYPERLINK\l"_Toc170212683"摘要PAGEREF_Toc170212683\hIHYPERLINK\l"_Toc170212684"AbstractPAGEREF_Toc17