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APythonpackagewithbindingstothe"VirtualInstrumentSoftwareArchitecture"VISAlibrary,inordertocontrolmeasurementdevicesandtestequipmentvia GPIB,RS,orUSBTestsystemdeveloperscanbenefitgreatlyfromasoftwarearchitecturethatallowsforeasyinterchangeabilityofinstrumentsinthosesystems. VISAisastandardforconfiguring,programming,andtroubleshootinginstrumentationsystemscomprisingGPIB,VXI,PXI,Serial,Ethernet,and/orUSB interfacesPDF;VPPCharterDocument:Word:PDF;VPPSystemFrameworksSpecification:Word:PDF;VPPInstrumentDriversArchitectureandDesign Specification:Word:PDF;VPPInstrumentDriverFunctionalBodySpecification:Word:PDF;VPPInstrumentDriverInteractiveDeveloperInterface Specification:Word:PDFThisdocumentgivesanoverviewofNationalInstruments'implementationoftheVirtualInstrumentSoftwareArchitectureAPI, commonlyreferredtoasNI-VISAAshortreferencetovirtuallaboratoriesisalsoincludedEmbedSystemYoucanuseNI-VISAtocommunicatewithmost instrumentationbusesincludingGPIB,USB,Serial,andEthernetInthischapterwedescribebasicconceptsofvirtualinstrumentation,aswellasbiomedical applicationsofvirtualinstrumentation.Inthesecondsectionwegiveabriefhistoryofvirtualinstrumentation.EvolutionofVirtualInstrumentation.Butlet’stryto understandwhatitisandwhyit’stalkedaboutsomuchinTestandMeasurementcirclesNosurpriseshereVirtualInstrumentArchitectureofVirtual InstrumentationThesectionalsoincludesinformationonhowtocreatesessions,howtouseformattedI/O,andhowtouseeventsIntroductiontoVirtual InstrumentationVXIPlug&Play(VPP)SpecificationLiquefiedPetroleumGasIntroductiontoVirtualInstrumentationKeywords:Virtualinstrument,virtual instrumentThearchitectureofavirtualinstrumentandcontemporarydevelopmenttoolsaredescribedinthethirdsectionVISAOverviewProvidesashort descriptionoftheAgilentVirtualInstrumentSoftwareArchitecture(VISA)UsingopenindustrystandardsoftwarearchitecturessuchasVirtualInstrument SoftwareArchitecture(VISA),andInterchangeableVirtualInstruments(IVI),developersareabletocreatesystemswithR&S®VISA(Linux)Software packagesOpenSourceAcknowledgment SoftwarepackagesThesoftwarecontainedinthisproductmakesuseofthefollowingopensourcesoftware packagesChapterAccessesPrematureChallengesofVIDefinitionofVirtualInstrumentationTraditional(VirtualInstrumentSoftwareArchitecture)Two commonformsofVISAareavailableforusewithRigoldevices:NI-VISA™:TheVirtualInstrumentSoftwareArchitecture(VISA)isastandardforconfiguring, programming,andtroubleshootinginstrumentationsystemscomprisingGPIB,VXI,PXI,Serial,Ethernet,and/orUSBinterfacesDescriptionBoththehardware andsoftwarecomponentsofavirtualinstrumentsaredetailedThischapterdealswithvirtualin-strumentsandwiththedifferentformsoftheirimplementation CharacteristicsofVXIInstrumentsKeywordsOncompletionofthischapterthereaderwillhaveaknowl-edgeon:HistoryofInstrumentationSystemsToputit simply,VISAisaTestandMeasurement(T&M)standardforenablingcommunicationbetweenanapplicationandaninstrumentinstrumentsarethusnamedvirtual instrumentsIfyouareusingnewinstrumentsoraredevelopingnewI/OapplicationsInordertoeasethisunfortunatesituation,theVirtualInstrumentSoftware Architecture(VISA)specificationwasdefinedinthemiddleoftheiesVirtualInstrumentSoftwareArchitecture(VISA)ProgrammingplatformsProgrammingwith VISADescribesthebasicsofVISAandlistssomesampleprogramsVISAstandsforVirtualInstrumentSoftwareArchitectureLearningObjectivesPackage VersionLicenseavahiGNULesserGeneralPublicLicensevlibcGNULesserGeneralPublicLicensevAgilentVirtualInstrumentSoftwareArchitecture(VISA) isanI/OlibrarydesignedaccordingtotheVXIplug&playSystemAlliancethatallowssoftwaredevelopedfromdifferentvendorstorunonthesamesystem ProgrammingRequirementsofVITheBasics.SensorInterface.InstrumentationSystem.