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1、摘要本系统是一个基于RS-485总线的转速表系统。系统的硬件由单片机、键盘和数码管显示模块构成。本设计主要是把变频器回传的数据读取出来,传送给单片机进行处理转换，然后通过数码管显示出来，并可以随着电机转速的变化实时通过数码管显示出来,直观的反映出来,便于读取转速和其他数据.在工业现场当中,所有的生产设备基本上都是一个信息孤岛,所有的信息只是在设备当中使用没有与外界进行信息交换,自动化程度较低.如果能够使得生产设备进行信息数据相互交换,那么自动化程度将大大提高。在工业自动化控制系统中，最为常见的是PLC和变频器的组合应用，并且产
2、生了多种多样的PLC控制变频器的方法，其中采用RS-485通讯方式实施控制的方案得到广泛的应用：因为它抗干扰能力强、传输速率高、传输距离远且造价低廉。关键词:RS-485总线转速表Modbus通信协议29AbstractThissystemisbasedontheRS485busratemetersystem.ThesystemhardwarebytheSingle-ClipMicrocomputer,thekeyboardandthedigitaltubedemonstratesthemoduleconstitution.T
3、hisdesignmainlyisreadingthefrequencychangerfeedbackdata,TransmitscarriesonprocessingtotheSingle-ClipMicrocomputertotransform,thendemonstratedthroughthedigitaltube,andmayreal-timedemonstratealongwiththeelectricalmachineryrotationalspeedchangethroughthedigitaltube,Dir
4、ect-viewingreflection,IsadvantageousforreadingtherotationalspeedandotherdataInthemiddleofindustryscene,Allproductionequipmentbasicallyallisaninformationisolatedisland,Allinformationonlyareuseinthemiddleoftheequipmenthavenotcarriedontheexchangeofinformationwiththeout
5、side,TheautomaticityislowIfcancausetheproductionequipmenttocarryontheinformationdatatoexchangemutually,Thentheautomaticitygreatlywillenhance.Intheindustrialautomationcontrolsystem,isPLCandthetransducerserialcombinationapplicationwhichismostcommon,andproducedmanyandv
6、ariedPLCtocontrolthefrequencychangerthemethod,inwhichusestheRS-485communicationwayimplementationcontroltheplantoobtainthewidespreadapplication:Becauseitsantijammingabilitystrong,thetransmissionspeedhigh,thetransmittingrangefaralsotheconstructioncostisinexpensive.Key
7、word:RS485busSpeedinstrumentationModbuscorrespondenceagreement29目录第1章绪论···································································································11.1设计背景·······················································································1
8、1.1.1仪表······················································································11.1.2RS-485总线·······························
