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2011.06RS-4851,1,2(1.,221116;2.,471022):RS-485;VisualBasic;;51:2011-05-17:2011-06-17:(1988-),,,,RS-485。,。,。、、。,,。:0,,。、。、、、,。,,,。1:“”“”。,。1。“”,。,,,RS-485,。,。,。“”,“”,,,、。。,,,,。1 !#$%&’’()*+,-./012!) 345!6’7’89:;=RS-485趩趰2011.06 22.1AT89S52、CMOS8,8KFlash。Atmel,80C51。AT89S52I/O,,I/O,,。2。2220V。RXD、TXDRS-485。INT0,。SCL、SDAI2C。P2,P1,P0LCD。“”,,:,,RS-485RXD、TXD。,,。2.23。。“”,,,INT0;,,,,INT0。INT0,,,。3、、、,,。2.3RS—485PC,,RS-485。,PC,RS-485/RS-232RS-485,4。4RS—485PCRS-485PCRS-485/RS232。PCRS-232COM。TTL,RS-485PC,。(1)RS-485RS-4855,MAX485RS-485。 !! !!# #$!$%&’ $% $ ’ (’)!*+,*+,*+,*,*,#*,*,#*,*,*,*,*,+*,*,*,#趩趲2011.065RS-485MAX485MaximRS-485,+5V,300uA,,TTLRS-485。MAX485REDE。RE“0”,;DE“1”,,MAX485,。,RXDTXDRODI,MAX485AB,120Ω。,。(2)RS-485/RS-232PCRS-485/RS-2326,3TLP-521,PCMAX485,,。RS-232RTS1(-12V),,,TTL1(+5V),RS-485DE,RS-485,,RS-232TXD(RTS)。RS-232RTS0(+12V),,,TTL0(+12V),RS-485RE,。RS-485R1,,,RS-232,TXD-12V,-12V,-12V,1;0,,,,+5V,RS-2320,0。2.47。3,。:、、、、LCD、、RS-485。,LCD。“”,,。“”,“”“”。3.1,,。,,。,。8。3.2RS-485,:(1)9600bit/s;(2):8,“0”“1”,,10;(3):PC,COM12;,2;(4):。.3.3(1)MSCommVisualBasic,Vi-sualBasic6.0MSComm(PC)。MSComm:。,MSCommOnComm趩趶2011.06,。。RS-4859。(2)①,:,、、、。②,MSCommOutPut。③,Rthreshold,onComm,onCommMSCommInPut,。6RS-485/RS-2327趩趷2011.069RS-4854,、RS-485VisualBasic、、,,,。,。[1],.PIC[J].,2008,31(1):53~55[2],.51[J].:,2008,24(1):41~42[3],,.RS-485PC[J].,2009,29:122~123 !#$%&!’’()*+*+,-./012*+345678569999:::: !#$!%&’()*+,+,-./012344556655668趩趹2011.06DesignofInfraredAlarmSystemBasedonRS-485BusFUWen-xuan1,GAOLi2,WANGXi-juan2(1.SchoolofElectricEngineeringandAutomation,XuzhouNormalUniversity,Xuzhou221116;2.CollegeofPhysicalandElectricInformation,LuoyangNormalUniversity,Luoyang471022)Keywords:RS-485Bus;VisualBasicSerialCommunication;HostComputer;51SCMIntroducesaninfraredalarmsystembasedonRS-485bus.Discussesthesystem'sprincipleandthehardware'sdesign.Andpresentsthestructurediagramofhardwareandthesoftwareflow.Thesystemcouldmakespotfortifyandaudibleandvisualalarm,also,itcanrealizeremotemonitoringandcomputeralarming.Thealarmissmall,long-distancecommunication,easytoexpandasaswitchboardadvantagesofmulti-pointalarmsystem.Afterrepeatedtesting,thealarmisreliableandhashighpracticalvalue.Abstract:[4],.VisualBasic[J].:,2003,3(1):28~31[5],,.RS-485[J].:,2007,29(S2):259~262[6].[M].:,1999:123~126[7],,.[M].:,2006:245-251.[8],.RS-485[J].,2003,12(3):67~71ResearchontheE-LearningResourceSharingModelBasedonAgletWANGJian-mei(BookInformationLibrary,LudongUniversity,Yantai264000)Keywords:E-Learning;Aglet;Agent;ResourceSharing;XMLE-learningprovidesafire-newlearningstyle.Ithasaspecialeffects,andmakestheresourcesharingtoberealized.Inordertoreachtherequirementofresourcesharing,basedontheopensourceplatform,Aglet,whichisdevelopedbyJava,presentsaresourcesharingmodel,alsoin-trodecesitsbuilding,description,andimplementation.Abstract:!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!(51)趩趻
本文标题:基于RS-485总线的红外报警系统的设计-付文轩
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