5989-6338EN.pdf VB.ET 编程安捷伦仪器通讯说明。Keysight Using V

文件名称: 5989-6338EN.pdf VB.ET 编程

所属分类: 制造

开发工具:

文件大小: 949kb

下载次数: 0

上传时间: 2019-07-03

提供者: m_z****

下载 (949kb)

不能下载？报告错误

详细说明：安捷伦仪器通讯说明。Keysight Using VISA COM 1/0 API ppl cation No Getting started The examples in this application note The visual Studio environment with the Solution Explcrer window were developed using C# 2003 and Visual VisaComDotNetclient-Microsoft Visual CH. NET [design- VisaComClient, cs Design] -回 Basic 2003 as part of Visual Studio 2003 El Ed yiew proiect Bild cbug Data Iock TEAM Tolt window Hedlp Professional Edit on. We will commonly ,彻·萨副电岛“,(·副,四 call them C# and vb throughout this 引罪山非机图创囤固,来③短看对0, Too box n x Start Pace Visacomclient cs [Design]. 4 pX sOlution Explorer - cmO:Bet Cient 9 x application note. In addition, Keysight IO T&M Tools- Libraries suite 14.2 was used 10 Client Test Appl.--x 4 5obtion'viseCamDotNetdlient'(I project arenas 哮 saComDotNetclient windows Forms First you must install Keysight VISA xPointer so System -a System. Data 心5y丈em, Draving COM1/0, Which is installed as part of LinkLabel O System, wind/.Forms ab Button -O 5ystem, xI the Keysight IO Libraries Suite. You can abi TextBox download the latest version of the io 国 visacomdent, cs M Chad: Box LibrariesSuiteatwww.keysight.com/find/oradicestton lib. After installing the Io Libraries Suite M GroupBox 4 PictureBox cherries you are ready to add vISA COM 1/0 to □pare your C# Microsoft Visual Studio project DataGrid To use VISA COM 1/0, you need to create sia Ched:. Box FarmBcrdertyd: Stable as ComboBox RightToLeit a reference to it in your project. To add a VISA COM I/o client COM reference to your proect, click the Treevie Dboard Ring The bex contained n the coned Solution Explorer"window in your C# project and right-click the"References Properties Dynamic Help menu item Ready The visual studio Add reference dialog You will see the "Add Reference"dialog The Visual Studio Add Reference dia.og Click on the“COM” tab to lcok for the Add Reference VISA COM reference vau will need. Select the VISA COM 3.0 Type Library"reterence ET COM Pe so that you can instantiate the Keysight Component Name TypeLib Ver. Path VISA COMI/O implementation. The VISA WCS_ SQL 7.0 Type Library 1.0 C: pRogram Files Microsoft Vi Select COM 3.0 Type Library also includes the wCWiz 7 1 Type Library 7,1 C: Program Files\ Microsoft Vi. type information for VISA COM 1/0 wCWiz 8.0 Type Library C: PRogram Files\Microsoft Vi VEGAS Shell 5.0 C: \Program Files( ommon Fil viewModel 1. 0 Type Library 1.0 C: Program Files Microsoft Vi VISA COM 1.0 Type Library 1,0 C: 1VXIPNP/Visa ComiGlobMgr, d‖l WISA COM 3.0 Type Library 3,0 C: 1VXIPNP!Visa Com GlobMgr, dll VISA COM 488. 2 Formatted I., 1.0 C: VXIPNP\ Visa Com BasFrmI VisAED C: \Program Files Microsoft Vi Visio 2000 Type Library [servi., 4.8 C: Program Files\Microsoft Vi Wisio Graph 2. 60 (Visio version., 2.60 Wisin HTMI Fxnort Su snort oh.. 1.0 C:pRogram files microsoft Vi. y Selected C omponent Name T Source Remove Ⅵ SA COM30 Type Library COM C:XIPNP\Visa Com GlobMgr dll Help Keysight Using VISA COM I/0 API in NET -Appl cation Note Get familiar with the object Browser Now that you have added the appropriate The visual Studio Oject Browser dialog references into your application, it is a good time to look at the interfaces Start Page Visa Client. cs [Design]* Object Browser 4X and classes available to use. Press Browse: Selected Components CTRL+ALT+J or go to the View men e Members of ' AccessMode and select Object Browser to open 三. visa. interop 呼 EXCLUSIVE LOCK the object browser. This window allows +0 Ivi oap LOAD_CONFIG you to examine the class hierarchies of all +0 Ivi,Visa 回NL0CK the currently referenced com and NeT O IviVisa. Interop daP SHARED LOCK projects and libraries. Take a look at Ivi +eP AccessMode 的 Addressspace Visa Interop to see the classes and +"EP AssertInterrupt Const interfaces you will be using AssertOr量 ty Const +-EP ATNControlConst +EP Buffer Mask +EP Conf lictHandler Type t的 EyentMechanism EP EventType +的 FDCMode +o-o FormattedIO488 t FormattedIo488Class +EP GPIBAddressState +eP HardwareInterface Type IBaseMessag IEEEASCIType +EP IEEEBinary Type +o EVent +o-o EVent GpibCIC +-o-0 IEventHandler +-o-o IEventIOCompletion +-0-o IEventManager IEventTrigger ∞ o IEventUsbInterrupt public sealed enum AccessMode: System Enum Member of Ivi, Visa. Interop Summary The enumeration of locking access modes ppl cation No Instantiating and using Keysight's VISA COM 1/0 in. NET Once you have your reterences to VISA COM in your project, you are ready to create and use VISA COM I/0 objects Included is an example of a simple method that creates a resource and uses the ViSa COM 488.2 Formatted 1/0 component to communicate with a keysight 54501A Oscilloscope. It is shown using both c# and C private void doInstrumentIo() Ivi Visa Interop. ResourceManagerClass rm new Ivi Visa Interop. ResourceManagerclass()i Ivi Visa Interop. FormattedIo488Class ioobj= new Ivi Visa Interop. FormattedIo488Class()i try object[] idr ioob. IO=(Ivi Visa Interop. IMessage)rm. Open("GPIB2: 10: INSTR", Ivi Visa Interop. AccessMode NO LOCK ,0,l)i ioob]. Writestring ("*IDN?", true)i idnItems =(object[ ] )ioobj ReadList(Ivi Visa Interop. IEEEASCIIType ASCIIType Any,",") foreach(object idnItem in idnItems System. Console. Out. WriteLine("IDN Item of type " idnItem. GetType(). Tostring()); System. Console. Out. Writeline("\tvalue of item is"+ idnItem ToString()) catch(Exception e) A YStem Console. Out. WriteLine("An error occurred: "+e Message)i finall yi ioobj IO Close(i y catch i tryi System. Runtime InteropServices. Marshal. ReleaseComobject(ioob]); catch i tryi System. Runtime InteropServices. Marshal. ReleaseComobject(rm)i catch I Keysight Using VISA COM I/O API in NET -Appl cation Note VB Private Sub DoInstrumentIO( Dim rm As Ivi Visa Interop. ResourceManagerclass Dim ioob] As Ivi Visa Interop. FormattedIo488Class Dim idnItem As object Dim idnItems As Object() rm New Ivi Visa Interop. ResourceManagerClass ioobj New Ivi Visa. Interop. FormattedIo488Class ioob].Io= rm. Open("GPIB2:: 10:: INSTR") ioobj.Writestring("*IDN?", True) idnItems ioobj ReadList(IviVisaInterop. IEEEASCIIType ASCIIType Any, ",") For each idnitem In idnttems Ms gBox("IDN Item of type idnItem. GetType(). Tostring()) MsgBox("Value of item is " idnItem. Tostring() Next idnitem Catch e As Exception MsgBox ("An error occurred: t e Message Finall ioob. IO. Close() Catch ex As Exception Try System. Runtime InteropServices. Marshal. ReleaseComobject(ioob]) Catch ex As Exception End卫 Tr System. Runtime InteropServices. Marshal. ReleaseComobject(rm) Catch ex As Exception End T y End Sub ppl cation No Using Keysight VISA COM /0 in After creating the VISA COM/O Advanced VISa Com/o Microsoft visual studio objects to be used, you see a call to WriteString(). This call sends the operations in. NET The line Ivi Visa. Interop *IDN? string to the instrument. The next ResourceManagerclass rm ine uses the readlist() method to One of the design goals of Microsoft newIviVisa Interop parse the *IDN? return value. The method COM technology was to try to simplify ResourceManagerclass()creates the returns an object, which you can cast to threading for typical COM programmers Global Resource Manager(GRM), which an array based on the type parameter They used the concept of Apartments can instantiate(create) any VISA COM of the ReadList()Method. With type where certain threading behaviors were resource installed on the system. Here AScIIType Any, the return value is an guaranteed so as to limit the possible you see it used to open a GPIB resource at array of obiects multithreading interaction the programmer GPIB2. 10: INSTR". The line Ivi, visa would have to detend against Perversely, Interop. FormattedIo488Class The code in the Finally block is designed this made thread programming signiticantly iob]= new Ivi Visa. Interop. to clean up the l/0 to be sure that the nore difficult in some cases. Microsofts FormattedIo488Class()creates an 1/0 session is closed immediately, all NET architecture has placed themulti- instance of the 488.2 Formatted 1/0 Class, hardware v/O resources are released and threading burden back on the program- which can help with parsing and writing any valid Com ob ects are released. In mer, and there are some interactions that out the data types most instruments use. COM environments like Visual C++, it was must be guarded against when dealing Setting the lO property of the formatted possible to destroy objects by removing ith possible multithreaded situations /0 object prepares the object for reading the last reference to them. but in the. NEt during VISA COM /O programming and writing environment, you must explicitly close the session. Call the close( method The programmer must worry about VISA You may notice a few differences between on the Keysight VISA COM Formatted 1/0 COM/0 and threading when VISA events C# and VB. These differences in large part session to cause the session to release any are used to communicate with a device mirror the differences between Microsoft hardware 1/0 resources This can take the form of asynchronous Visual C++ 6 and Microsoft Visual Basic 170, handling service requests, and 6. Aside from the obvious syntactic other VISA events. The following code differences there is a capability difference demonstrates handing an SRQ event on a in how you can use vIsa CoM i/o. the keysight 34401A multimeter. Only the VB optional parameters on the o version is included for brevity methad in VB are not optional in C#t, and optional parameters in general are lost in c# 08 Keysight Using VISA COM I/O API in NET -Appl cation Note VB Public class form1 Inherits System. Windows Forms Form Implements Ivi Visa Interop. IEventHandler (extra VB stuff omitted) Dim rm As Ivi Visa Interop. ResourceManager Class Dim msg As Ivl. Visa. Interop. IMessage Delegate Sub t srqEvent(Byval man As IviVisa Interop. IEventManager, ByVal evnt As Ivi Visa Interop. IEvent Public sub SrqEvent(ByVal man As Ivi Visa Interop. IEventManager, ByVal evnt As Ivi Visa. Interop. IEvent) man. Close() evnt Close() System. Runtime InteropServices. Marshal. ReleaseComobject( rm) Catch End Try MsgBox("SRQ Occurred! " Ms gBoxStyle OKOnly,"SRQ Event") End Sub Private Sub DoAdvancedIO( rm= New Ivi Visa Interop. ResourceManagerclass msg= rm. Open("GPIB1:: 22:: INSTR") DOGenerateSRQ(msg) End sub Public Sub DoGenerateSRQ(ByVal msg As Ivi Visa Interop. IMessage) Dim eventman As Ivl. Visa. Interop. IEventmanager eventman =msg Reset dmm and clear DMm status registers msg. Writestring("*RST; *CLs"& vlf System. Threading Thread. sleep(500) eventman. InstallHandler(Ivi Visa Interop. EventType EVENT SERVICE REQ, Me, 1000) eventman. EnableEvent(Ivi Visa Interop. Eventrype EVENT SERVICE REQ Ivi Visa Interop. EventMechanism EVENT HNDLR) 09 Keysight I Using VISA. COM I 0 API in. NET -Appl cation Note Enable ' operation complete bit to set standard event bit in status byte msg Writestring("*ESE 1"& vlf) System. Threading. Thread. Sleep(500 Enable 'standard event bit in status byte to pull the IEEE-488 SRo line String("sre 32 " vlf System. Threading. Thread. Sleep(500 Assure synchronization msg. Writestring(*OPC?"&vlF) System. Threading. Thread. Sleep(500 recieve *oPc? result msg. Readstring (1000) set dmm to 10 volt dc range msg Writestring("Configure: Voltage: dc 10& vbLf) set integration time to 10 Power line cycles (PLC msg Writestring("voltage: DC: NPLC 10"& vlf) System. Threading. Thread. Sleep(500) set dmm to accept 1 trigger msg. Writestring(Trigger: count 1"& voLf System. Threading Thread. Sleep(500) Place dmm in 'wait-for-trigger, state msg. Writestring("Init"& vlf System. Threading Thread. Sleep(500) Set ' operation complete bit in standard event registers when measurement is complete msg.Writestring("*OPC"& vlf End Sub Public Sub HandleEvent(ByVal man As Ivi Visa Interop. IEventManager, ByVal evnt As Ivi visa Interop. IEvent, ByVal unused As Integer) Implements Ivi Visa. Interop. IEventHandler HandleEvent Dim args()As Object the threadsafe Invoke methods are the only safe thing to do in a CoM callback args New Object(1)(man, evntH Me BeginInvoke(New t srqEvent(Addressof Me. SrqEvent), args End Sub ppl cation No Advanced /0 in Microsoft Visual VISA COM /0 and VB threading Conclusion Studio One of the few safe method calls in such The doAdvancedIo( method creates a context is the BeginInvoke()method VISA COM I/0 is a viable method the /0 session and passes it to the of the. NET System. WindowsForms of programming instruments in Microsoft's Control class. This method accepts a B and Ct languages, which live in the DoGeneratesro( method, which NET Delegate cass, which is a wrapper NET execution environment. Both tools generates a service request and for a method. We wrap up a method on can quickly import the VISA COM1/0 enables event handling. The VB class Forml implements the VISA COM/0 the form abject called SrqEvent() that types for use in a relatively straightforward interface EventHandler. This class ha we want to do useful things on the VB. Et fashion. While the Keysight T&M Toolkit one method, HandleEvent(), which orm class when an event occurs. The provides the best solution for simple. NE is called by VISA COM 1/0 whenever an BeginInvoke()method then queues up T&M programming tasks, basic and even event the client is interested in occurs a request on the application's main thread advanced l/0 operations are possible with The InstallHandler() method call to call the delegate's underlying method VISA COM I/O and the Microsoft. NET informs visa COM to call the forms on the form's main thread when it is free. programming languages HandleEvent() method implementation As a consequence, you have to make sure whenever an SrQ event occurs. The that the application s main thread is active EnableEvent()call turns on asynchro and not occupied in a blocking task. Also nous handler invocation for SrQ events to receive the visa com event at all your application cannot be blocking if it is The HandleEvent() method does not single-threaded. In a console application, have much code in it. This is because whel this usually means calling Applic. you rece ve an event from VISA COM 1/0 DoEvents()occasionally to give queued ye don't know what thread it asynchronous COM events an opportunty InVB 6, you could be certain that it was to execute on the application s only thread the applications main thread because VB 6 used apartment threading, guaranteeing ySA COM 1 /0 and VB threading a single-threaded environment for Com VISA COM 1/0 B application and VB methods. In an attempt to reduce erhead and complex implementation errors. Microsoft has abandoned this VISA COM VB Form1 strategy and it is up to the user to 1/0 worker object main recognize that this method call occurs re VISA COM thread Methods in an unknown thread context. As a VISA COM Write(, Read(), etc consequence, you must know which. NET asynchronous Srq event( methods are thread-specific and which event threat BeginInvoke() ones are not, and be aware of your current threading context. Most form methods ar Handle Event() VISA CoM 1/0 callback thread-specifiC, so you must be carefu lEventManager Handle Event( what methods you use This diagram shows the thread interaction going on in the sample code above assuming the application is multi- threaded

(系统自动生成,下载前可以参看下载内容)