Detailedexplanation
Terminal,namelycomputerdisplayterminal,istheinputandoutputdeviceofcomputersystem.Thecomputerdisplayterminalisproducedwiththecentralizedprocessingmodeofthemainframeera,andcontinuestodevelopwiththedevelopmentofcomputingtechnology.Sofar,computingtechnologyhasexperiencedthreedevelopmentperiods:thehostera,thePCera,andthenetworkcomputingera.Theterminalisadaptedtothethreestagesofcomputingtechnologydevelopment,andtheapplicationhasalsoexperiencedthethreestagesofcharacterdumbterminals,graphicterminalsandnetworkterminals.form.
Terminalequipmentisdividedintotwotypes:general-purposeandspecial-purpose.General-purposeterminalequipmentreferstogeneral-purposecomputerinputandoutputdeviceswithcommunicationprocessingandcontrolfunctions.Thetypeandquantityofconfigurationdependsontheneed.Theinputandoutputdevicesthatcanusuallybeselectedare:keyboard,cardreader,papertapereader,opticalcharacterormarkrecognitionmachine,voicerecognizer,serialorlineprinter,display,cardpunchingmachine,papertapepunchingMachines,voicesynthesizers,floppydiskdrives,tapedrives,diskdrives,etc.Generalterminalequipmentisroughlydividedintoremotebatchprocessingterminalsandinteractiveterminalsaccordingtothevarietyandquantityofconfiguration.
Classification
Terminalclassification:Commonclientdevicesaredividedintotwocategories:oneisathickclientandtheotherisathinclient.Then,thedevicesbasedontheopenindustrystandardarchitectureandmorepowerfulfunctionsrepresentedbythePCarecalled"fatclients",andtheothersareclassifiedas"thinclients."Thespaceandscaleofthethinclientindustryisalsoverylarge,nolessthanthescaleofthePC.
1.Fromatechnicalperspective,thedataprocessingmodewillbedecentralizedtocentralized,theuserinterfacewillbemoreuser-friendly,manageabilityandsecuritywillbegreatlyimproved;atthesametime,communicationandinformationprocessingmethodswillalsobefullynetworked,andcanachieveunprecedentedSystemscalabilityandcross-platformcapabilities.
2.Intermsofapplicationform,thenetworkterminalequipmentwillnotbelimitedtothetraditionaldesktopapplicationenvironment.Withthediversificationofconnectionmethods,itcanbeusedasadesktopdevice,anditcanalsobeusedinmobileandportableways.Therewillbediversifiedterminaldevices.Productform:Inaddition,withtheexpansionofcross-platformcapabilities,inordertomeettheneedsofdifferentsystemapplications,networkterminaldeviceswillalsoappearinmanyfaces:Unixterminals,Windowsterminals,Linuxterminals,Webterminals,Javaterminals,andsoon.
3.Intermsofapplicationareas,terminaldevicesintheeraofcharacterdumbterminalsandgraphicterminalscanonlybeusedinwindowserviceindustriesandcounterserviceswillbegoneforever,andnon-counterservicessuchasonlinebanking,onlinesecurities,andbanklow-counterserviceswillbeextensiveAdoptnetworkterminalequipment,andtheapplicationfieldofnetworkterminalequipmentwillalsorapidlyexpandtoemergingnon-financialindustriessuchastelecommunications,electricity,taxation,education,andgovernment.
InVoIP,theterminaldeviceisageneraltelephone.
Remoteterminal
Enableusersfarawayfromthecomputertoperformbatchinputandoutputoperationsontheremotecomputer.Thesimpleststructureofthisterminalconsistsofaprinter,acardreaderanditscommunicationcontrolprocessor.Infact,theremotebatchprocessingterminalequipmenthasthefunctionofaminiorsmallgeneral-purposecomputerinalarge-scalecomputersystem.Sincetheinformationinthecommunicationlineistransmittedinaserialmanner,thecommunicationcontrolprocessorintheterminaldeviceneedstoconverttheinformationinputtothecomputerfromparalleltoserialandsendittothecommunicationline,andsendtheinformationfromthecommunicationlineTheoutputischangedfromserialtoparallel;inaddition,itisnecessarytomonitortheprocessingofinformationtransmissionanderrorcorrectionaccordingtotheprescribedcommunicationprocedures.
Interactive
Alsoknownasaconversationalterminal,itenablestheuserandthecomputersystemtoperformdataprocessingoperationsinthemannerofhuman-computerinteractionorconversation.Thesimplestinteractiveterminalusedanelectromechanicalkeyboardprintingterminalintheearlydays.Bypressingthekeysmarkedwithcharactersonthekeyboardbyhand,electricalsignalswithcorrespondingcharactercodescanbegenerated,inputtothecomputer,andprintedoutontheprinterpaper.Characters:Thecharacterencodingsignaloutputbythecomputerisalsoprintedonpaperbytheprinterascharacters.Whenthereisnoneedtorecordandsavetheresultsofman-machineconversations,apicturetubeisusedinsteadofatypewritertodisplaycharacterinformation,thatis,anelectronickeyboardcharacterdisplayterminalisused.Inordertomakethepicturetubedisplayflicker-free,adisplaymemoryandaread-onlymemoryforthefontgeneratormustbeinstalledintheterminal.Inaddition,adisplaylogicprocessingcontrollermustbesetuptocontroltheelectronbeaminthepicturetubeaccordingtothetimingandsynchronizationoftheTVrasterscan.Therequiredcharacterpictureformatisdisplayedonthephosphorscreen.Sincethedisplaymemorycanbeusedtostoreanddisplaythetypedandoutputcharacterinformationatthesametime,thekeyedpositioningcursorcanalsobeusedtolocate,modify,moveup,down,left,andright,andeditthedisplayedinformationcontent.
Onthebasisofkeyboardcharacterdisplayterminal,newmultifunctionalterminalssuchasChinesecharacterdisplayterminal,graphicdisplayterminalandcolorimagedisplayterminalhavebeensuccessfullydeveloped.
Networkterminalequipment
Networkterminalequipment(Networkterminal)isakindofterminalequipmentdedicatedtothenetworkcomputingenvironment.ComparedwithPCs,therearenostoragedevicessuchasharddisks,floppydrives,opticaldrives,etc.Itobtainsresourcesthroughthenetwork,andapplicationsoftwareanddataarealsostoredontheserver.Forexample,mobilephones,computers,andotherdevicesyouusearecalledterminaldevices.