LabVIEW介绍
LabVIEW is a kind of procedure development environment, is developed a development by the United States nation instrument(NI) company of, is similar to develop environment at the C and BASIC, but LabVIEW and the showing of other calculator languageses Zhao differentiation BE:All of other calculator languages are adoptions according to the text originally of the language produce code, but what LabVIEW usage is a sketch and turn edit the language G write procedure, the output procedure is the form of frame diagram.BE as similar to BASIC as C, LabVIEW is also an in general use plait distance system, there is a huge function database that completes any plait distance task.The LabVIEW function database includes a data to collect, GPIB, string control, data analytical, the data show and the data save, etc..LabVIEW also has traditional procedure to adjust to try tool, if the constitution breaks a point, show a data by animation and it the result of sub- procedure(son VI) and single step performance etc., the adjusting of easy to procedure tries.The virtual instrument(virtual instrumention) is according to the instrument of calculator.The closely combining of the calculator and instrument is an important direction that the instrument develops currently.Roughly say this kind of to combine two kinds of methods, 1 kind packs the calculator into instrument, the example of its typical model is the instrument that the so-called intelligence turns.Is strong day by day along with the calculator function and its physical volume gradually narrows, this instrument function is also more and more strong and have already appeared instrument with the built-in system currently.Another method is to pack the instrument into a calculator.Take the in general use calculator hardware and the operate system as to rely on, carry out various instrument function.The virtual instrument mainly means this way.The frame diagram of underneath reflected a familiar virtual instrument project.The main characteristics of virtual instrument includes:Adopted in general use hardware possibly, the difference of various instrument mainly was a software.Can well develop the ability of calculator, there is strong data handling function, can create an instrument with stronger function.The customer can be according to ownly needing to be defined and making various instrument.The virtual instrument is actually a to collect system according to the data of instrument need organization.The foundation theories involving in the research of virtual instrument mainly has a calculator data to collect to handle with number signal.In this realm currently, using more extensive calculator language is LabVIEW of the company of the United States NI.The origins of virtual instrument can trace back to till 70's in 20th century, that time calculator's measuring to control system has already had much obvious development in the realms, such as national defense and aerospace...etc..PC machine after appearing, the calculator of instrument class turns to make possible, even before Microsoft Windows of the company is born, the NI company has already computed to release LabVIEW2.0 on board the edition before in Macintosh.To the long term, system of virtual instrument and LabVIEW, effective of the research development make that companies become generally accepted industry authority.LabVIEW the latest edition is a LabVIEW8.6 currently, LabVIEW 8.6 added more characteristics for multi-threading function, this kind of characteristic is in the edition in 19985 in is led by the first time to go into.Use LabVIEW software, the customer can ask for help from the software environment that it provides, that environment because of its data flows to weave distance characteristic, the tool of LabVIEW Real-Time to develop to the built-in platform of check support more, and from top to bottom of is much pit but the software layer of design, is that the head that carries on proceeding together a plait distance choose.The PC of commonness has some ineluctable weaknesses.Virtual instrument or the calculator test system function set up with it are impossibly too high.An important development direction that is a calculator to turn instrument currently drew up VXI standard, this was a kind of instrument that puts a cassette.Each instrument is one to put card, for promising instrumental function, and then adopting more hardware, but these cassette instruments all have no front-panel, its front-panel still uses a virtual way in the calculator screen last emergence.These cards insert standard VXI machine box, again with calculator connect with each other, constituted a test system.VXI the instrument price is expensive and released a kind of cheaper PXI again currently standard instrument.Another problem that the virtual instrument studies is with each other connecting of various standard instrument and and the conjunction of calculator.Use currently more is IEEE 488 or GPIB negotiate.The future instrument should be what network turns.The development environment of plait distance language that LabVIEW(Laboratory Virtual instrument Engineering Workbench) is a kind of sketch to turn, it is broadly accepted by the industrial boundary, academic circles and research laboratory and see to a data of standard to collect to control software with instrument.LabVIEW integrated to collect all functions of the card communication with hardware and data of satisfying GPIB, VXI, RS-232 and RS-485 agreement.It still inside placed the database function of easy to application software standards, such as TCP/IP and ActiveX...etc..This is the strong and vivid a function software.The making use of it can expediently build up its own virtual instrument, its sketch turns of the interface make to weave a distance and use processes all vivid and interesting.The procedure language that the sketch turns, and then be called "Ｇ " language.Basically don't write a procedure code while using this kind of language plait distance, take but generation of is flow chart or frame diagram.It made use of technical term, diagram mark and concept that the technical personnel, scientist and engineer acquaints with possibly, therefore, LabVIEW is a tool that faces to an end user.It can strengthen the ability that you set up your own science and engineering system and provided to carry out an instrument plait the distance and data collect the convenient path of system.Use it carries on a principle research, design, tests and carry out instrument system, can consumedly raise a work efficiency.Make use of LabVIEW, can produce independence to circulate of can carry out a document, it is an of 32 real edit and translate a machine.Be like many important softwares, LabVIEW provided various editions of Windows, UNIX, Linux and Macintosh.Its main convenience be, can pass change software under the circumstance of a hardware, can carry out the function of different instrument gauge, very convenient, is an equal to software namely hardware!The sketch in nowadays' turning is mainly the system of upper level, the domestic has already developed the single slice of machine plait distance system(support 32 built-in systems, and can expand of) that a sketch turns now, continuously perfect medium(everyone can search CPUVIEW will have more detailed information
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