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摘要：本设计采用基于32位工业级ARM7处理内核微处理器LPC2131为系统主控制器。采集电路使用16位高精度、低功耗模数转换芯片CS1160完成对一路0V到5V的模拟电压信号或热电耦、热电阻信号的数据采集；无线数据传输使用单片收发芯片IA4421实现系统的无线通信，其最高无线数据传输数率57600bps。系统能通过RS-485接口把采集到的数据实时的传输给PC机，由PC机完成采集数据的显示、存储，也可通过PC机实现大范围的控制和组网。本系统分为下位机和上位机两部分，下位机负责采集，转换和处理A/D数据，并通过无线通信传输给上位机。上位机通过无线通信收集下位机发送的采集数据，并由RS-485通信接口将数据传输给PC机。上位机也可接收PC机的控制信号实现对下位机的控制。系统采用工业标准24V直流电源供电，使用无线频段为国际通用的433MHz数传频段，无线发射功率5dBm，接收灵敏度-100dBm，并拥有5个无线信道数，采用FSK调制方式，无线数据传输速率为9600bps，可支持标准SPI数据接口。经过实地测量，室内最远无线传输距离为35m，室外最远无线传输距离为200m，在24℃环境下系统72小时连续无故障工作，模拟电压采集精度可达0.2%FS±1字，温度漂移小于200ppm/℃。系统中一台上位机可与16台下位机进行无线通信，每台下位机采集数据更新频率为0.2ms。此系统可以广泛应用在工业采集控制场合中，达到了本设计的初衷。关键字：ARM7模数转换无线数据传输RS-485接口Abstract：ThedesignusesLPC2131asthemaincontrollerofthesystemwhichisbasedon32bitindustrialARM7core.Thedataacquisitioncircuituses16bithigh-precision,low-powerADCchipCS1160tocompletethedataacquisitionof0Vto5Vanalogsignal,thermoelectricvoltagecouplingandheatresistancesignals；ThewirelessdatatransmissionmoduleemployssingletransceiverchipIA4421torealizethewirelesstransmission,andthespeedofthewirelessdatatransmissioncouldachieve57600bps.ThesystemcantransferthecollecteddatatothePCinreal-timethroughRS-485,andthePCcompletesdisplayandstorageofthecollecteddata,thesystemcanalsoachieveestablishmentofnetworkanddistantcontrol.Thesystemisdividedintomasterandslavemachine,Theslavepartisresponsiblefortheacquisition,conversionandprocessingofA/Ddata,thenittransferthedatabywirelesstransmissionmoduletothehostcomputer.Thehostmachinecollectsthedatafromslavemachine,thentransmitthedatatoPCbyRS-485.PCcanalsoreceivethePC-controlsignaltoachievetheslavecomputer'scontrol.Systemusesindustry-standard24VDCasthepower,andittakes433MHzbandasthesystem’sradiofrequency.Thetransmittingpoweris5dBm,andreceiversensitivityisupto-100dBm.Thesystemhasnotonlyfivewirelesschannel,butalsosupportastandardSPIinterface.Itcantransferthedataattherateof9600bpswithFSKmodulation.Afterthepracticalmeasurement,Thefarthestindoorwirelesstransmissiondistanceis35m,andthefarthestoutdoorwirelesstransmissiondistanceis200m.Ina24℃environment,systemworked72hourscontinuouslywithoutfault.It’sanalogvoltageacquisitionaccuracyof0.2%FS±1word,andtemperaturedriftislessthan200ppm/℃.Ahostmachinecancommunicatewith16slavemachineatthesametime,andtheupdatingtimeforthedatacollectionisjust0.2msforeveryslavemachine.Thedesignofthissystemisfullyrealizedanditcanbewidelyusedinindustrialdataacquisitionandcontrol.Keywords：ARM7ADCWirelessDataTransmissionRS-485I目录引言..........................................................................................................................11设计要求.....................................................................................................................12系统方案论证与设计.................................................................................................32.1控制器方案论证................................................................................................32.2无线通信方案论证............................................................................................42.3A/D采集方案论证............................................................................................42.4与PC通信接口方案论证.................................................................................52.5系统硬件方案选择............................................................................................52.6系统整体方案设计............................................................................................63硬件开发工具、特点、流程与要求.........................................................................83.1硬件开发工具介绍............................................................................................83.2硬件开发特点..................................................................................................103.3硬件开发流程与要求......................................................................................103.3.1原理图设计流程与要求............................................................................113.3.2PCB设计流程与要求................................................................................133.3.3硬件测试要求............................................................................................174硬件单元电路设计...................................................................................................194.1LPC2131最小系统设计.................................................................................194.1.1ARM7和LPC2131简介...........................................................................194.1.2LPC2131引脚功能描述............................................................................204.1.3基于LPC2131的最小系统设计...............................................................234.2IA4221无线收发电路设计.............................................................................244.2.1IA4221简介...............................................................................................244.2.2IA4421封装与引脚功能描述...................................................................254.2.3基于IA4421的无线收发电路设计..........................................................274.3系统电源设计..................................................................................................284.3.1系统电源设计的重要性............................................................................284.3.2前级DC-DC降压电路设计......................................................................284.3.3后级隔离电源设计....................................................................................304.4模拟量采集电路设计......................................................................................32

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