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RS485RS485RS485PCAT82S52DS18B20AT89S52485MAX485PCRS485DS18B20ABSTRACTRS485BUSDUETOTHESENDINGANDRECEIVINGBALANCEWAYTODIFFERENCEOFCOMMONMODEREJECTIONCAPABILITYISSTRONG,HIGHSENSITIVITY,THETRANSMISSIONDISTANCE,THECHARACTERISTICSOFHIGHTRANSMISSIONRATEINREMOTECOMMUNICATION,REMOTEMEASUREMENTHASBEENWIDELYUSED,ESPECIALLYINTHECONTROLFIELD,WILLALLKINDSOFCONTROLINFORMATIONTHROUGHTHERS485BUSREALIZINGREMOTEMONITORINGANDCONTROLTHISPAPERMAINLYINTRODUCESTHESINGLECHIPMICROCOMPUTERANDCOMPUTERTHROUGHTHERS485SERIALBUSFORREMOTECOMMUNICATIONMEASUREMENTSYSTEMDESIGN,INCLUDINGAPCASHOSTDATAPROCESSINGANDMULTIAT82S52SINGLECHIPMICROCOMPUTERASFROMREALTIMETEMPERATUREMEASUREMENTMACHINE,FROMTHEMACHINEISTHETEMPERATURESENSORDS18B20AT89S52MCMANDFORMASIMPLEANDPRACTICALREALTIMETEMPERATUREMEASUREMENTSYSTEM,FROMTHEMACHINEMAYCONDUCTINDEPENDENTMEASUREMENT,ANDTHETEMPERATUREOFTHEREALTIMEMEASUREMENTINFORMATIONTHROUGHA485BUSINTERFACEOFTHEMAX485CHIPSWILLDATATOTHEHOSTPCMACHINEPROCESSING,INORDERTOREALIZETHEREMOTEREALTIMEMONITORANDDATATRANSMITTEDOVERALONGDISTANCETHEWHOLESYSTEMDESIGNISSIMPLE,FLEXIBLEANDCONVENIENTUSE,THEPRICEISLOW,ANDCANOUTPUTTHEDIGITALQUANTITYDIRECTLY,THEREFOREHASTHEVERYSTRONGPRACTICABILITYKEYWORDSREMOTEMEASUREMENTRS485MCUASYNCHRONOUSCOMMUNICATIONDS18B20IABSTRACTII1111121321RS485322323423142326233RS4857931RS485932RS232CRS485113312331AT89S5212332DS18B201734181941RS485PC19411AT89S52SCONPCON19412AT89S522041321414RS485PC21415RS485AT89S52PC23416PC254227421DS18B2027422DS18B20294232933343511121234RS485TTLTTL200MV1200M1200BPS15KM300M120200MVRS48521RS48512342211510020539600BIT45551PC61WINDOWS2KEIL3ADDS18B2048523485RS48521222122231I/01AD7418ADI10A/D55L25100252153OMS2LM74SPI/MICROWIRELM74IOUALM741200625425MS3MAX6575L/HMAXIM40L252538545125DS18B205MAX6575L/HMCU1/08MAX6575L/HMAX6575LHMAX6575L5M4DS18B20DALLASDS75OMS912A/DDS18B20DS18B205512500625DS18B2OROMCPUDS18BZOI/ODS18B202121LM75LM74MAX6575DS1820DS18B20I2CSPI1WIRE1WIRE1WIRE3308050525100551255512555125551258888010080100232481632INTELMCS51MCS96ATMELAT89MCS51MICROCHIPPICMOTOROLA68HCXX21109286PHILIPS8780MCS51SIEMENSSAB80MCS51NEC78EPSONAT89S52DS18B20PCPCAT89S52233RS485RS485RS485RS485RS4851RS485RS485RS48512K321/224K1/448K1/896K6412825632SN75176SN75276SN75179SN75180MAX485MAX488MAX49064SN75LBC184128MAX487MAX1487256MAX1482MAX1483MAX3080MAX30892RS485SN75176SN75276SN75LBC184MAX485MAX1487MAX3082MAX1483SN75179SN75180MAX488MAX491MAX14824851RS485MAX485EMAX487EMAX1487E2MAX487MAX1487EMAXSN75LBC1843MAX1487ERS485PC3131RS232RS232/RS485RS485MAX1487EPCPCPCRS485PCPCPC9600BIT31RS485RS485RS485RS485TTLTTLRS485100KBIT/S1200MPCAT89S52RS485RS485MAX1487EMAX1487EMAXIM5VDC500UA25MB/S128RS485MAX1487E3232MAX1487EROAB02V,RO1ABDEFINERESPONE0XFF/SBITP1_4P14UNSIGNEDCHARAVOIDRESPONSE/ES0P1_41/MAX1487SBUFRESPONEWHILETITI0ES1VOIDSEND/PCES0P1_41/MAX1487ESBUFTL/PCWHILETITI0SBUFTHWHILETITI0ES1VOIDRECEIVE/PCES0P1_40/MAX1487EP0SBUFWHILERIRI0ES1VOIDINITIAL/TMOD0X20/12TH10XFD/9600HZTL10XFDTR11/REN1/SM01/3SM11SM21/P1_40/MAX1487EEA0ES0VOIDMAININITIALWHILE1IFRI1RI0ASBUFIFP2A/PCRESPONE/SM20EA1/ES1VOIDSERINTERRUPT4/RI0RECEIVE/IFRB81/PCES0/WHILE1SEND/PCIFTB81/BREAK/42421DS18B20DS18B201WIREAT89S51DS18B20DS18B20I/ODS18B20144DS18B20480960480DS18B204809601560602402DS18B201DS18B20DS18B2010111150160US45DS18B203DS18B2060120106011DS18B201515US45US1046DS18B20422DS18B2047DS18B20423INCLUDE/INCLUDE/_NOP_SBITDQP13UNSIGNEDCHARTIME/1MS3J2I33321010101/VOIDDELAY1MSUNSIGNEDCHARI,JFORI0I1IFDQ1DAT|0X80/11DATELSEDAT|0X00/00DAT/DQRIFORTIME0TIME1/DAT1FORTIME0TIME4TIME/,/VOIDREADYREADTEMPVOIDINIT_DS18B20/DS18B20WRITE0XCC/WRITE0X44/DELAYNMS200/INIT_DS18B20/DS18B20WRITE0XCC/
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