1. Introduction

With a wide array of instrument connectivity interfaces, it is important to choose the proper one for your application. The following flowchart will guide you through the choices you need to make when choosing the appropriate interface.

Figure 1. Flowchart on Choosing the Correct Interface

2. Instrument Drivers

Aug 28, 2018  Up to LabVIEW 2017 whenever I made in installer that included NI-VISA and/or NI-488.2 it would also install NI-MAX and the NI-VISA test panel. Now I see that NI-MAX has to be manually selected now, but I don't see anyway to install the VISA test panel.

In LabVIEW, an instrument driver is a set of VIs that communicates with an instrument. Each VI corresponds to a programmatic operation, such as configuring, reading from, writing to, and triggering an instrument. LabVIEW instrument drivers simplify instrument control and reduce test program development time by eliminating the need for you to learn the complex, low-level programming commands for each instrument.

3. Instrument I/O Assistant

The Instrument I/O Express VI, found on the Functions>>Instrument I/O palette, launches the Instrument I/O Assistant, which you can use to communicate with message-based instruments and graphically parse the response. For example, you can communicate with an instrument that uses a serial, Ethernet, or GPIB interface.

Using the Instrument I/O Assistant

The Instrument I/O Assistant organizes instrument communication into ordered steps. To use the Instrument I/O Assistant, you place steps into a sequence. As you add steps to the sequence, they appear in the step sequence window. Use the view associated with a step to configure instrument I/O. Four steps are available in the Instrument I/O Assistant.

Once you build a sequence of steps, you then execute the sequence to communicate with the instrument. When execution completes, use the response window in the Read and Parse view and Query and Parse view to interactively parse data into tokens and assign new data types to the tokens you create. Refer to figure 2 to see the Instrument I/O Assistant.

Note You must have the Instrument I/O Assistant installed to use the Instrument I/O Assistant Express VI. You install the Instrument I/O Assistant from the National Instruments Device Drivers CD.

Figure 2. Instrument I/O Assistant

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For more information about configuring the steps, click Show Help to view the embedded help within the Instrument I/O Assistant.

4. VISA API

VISA is a standard I/O API for instrumentation programming. VISA can control GPIB, serial, USB, Ethernet, PXI, or VXI instruments, making the appropriate driver calls depending on the type of instrument you use so you do not have to learn instrument-specific communication protocol. Before you begin using VISA, make sure you choose the appropriate method of instrument control.

Creating a Typical VISA Application

Use the I/O controls on the Controls>>I/O and Controls>>Classic>>Classic I/O palettes to specify the instrument or device resource you want to communicate with. Use the VIs and functions on the Functions>>Instrument I/O>>VISA palette to build VIs that control instruments.

For most simple instrument applications, you need only two VISA functions, VISA Write and VISA Read. Refer to the Basic Serial Write and Read Example VI in the labviewexamplesinstrsmplserl.llb for an example of how to use VISA functions.

Figure 3. Basic Serial Write and Read.vi Front Panel

This VI allows the user to select the VISA resource and operation they would like to perform, write, read or both. If the user selects to write to and read from the instrument, the VI will write the data to the instrument, read the response from the instrument and display it in the “read string” indicator, and then close the VISA session. Refer to the block diagram to see how this VI is programmed.

Figure 4. Basic Serial Write and Read.vi Block Diagram

The VISA Configure Serial Port.vi is used to configure the serial port with the specified baud rate, data bits, parity, stop bits and flow control. Next, the VI checks to see whether the user has selected to write to the instrument. If yes, the VI sends the string to the instrument using the VISA Write.vi and then waits for the specified amount of time. The VI then checks to see if the user selected to read from the instrument. If yes, the VI reads the data from the instrument using the VISA Read.vi and displays the result on the front panel. Finally, the VI closes the session to the port using the VISA Close.vi. This is important to do so another application can access the port without having to exit LabVIEW.

Use the VIs in the Functions>>Instrument I/O>>VISA>>VISA Advanced palette to build advanced VISA VIs. Refer to the labviewexamplesinstrvisa.llb for examples of using advanced VISA VIs.

Verifying VISA Communication

To verify that VISA and the device driver are installed correctly and VISA detects the instrument, first view the resource names that appear in the VISA resource name pull-down menu. If no resource names appear in this list, VISA or the device driver might not be installed correctly. Use Measurement & Automation Explorer to configure and test instrument communication. If resource names appear in the VISA resource name pull-down menu, but a particular instrument does not appear in the list, you might have a cable connection problem.

If VISA is installed correctly and VISA detects the instrument, but you receive errors when you run the instrument control application, you must identify what sequence of VIs produces the error in LabVIEW. If you are using an instrument driver, try to run each VI interactively and verify that each control is set appropriately.

NI I/O Trace is a tool for monitoring instrument I/O communications while your application runs. You can use NI I/O Trace to capture instrument I/O calls and their results while LabVIEW VIs run. Capturing calls and their results can help you debug problems with instrument communications. Windows - Select Start»National Instruments»NI I/O Trace to launch NI I/O Trace. Mac OS - Select Applications»National Instruments»NI I/O Trace and double-click the NI I/O Trace icon to launch NI I/O Trace. Linux - Type niiotrace in the command line to launch NI I/O Trace.

5. Creating an Instrument Driver

Use the Instrument Driver Project Wizard to create a new instrument driver project. Select Tools»Instrumentation»Create Instrument Driver Project to launch the Instrument Driver Project Wizard. After creating the new instrument driver, follow the Instrument Driver Modification Instructions in LabVIEW Help to complete the driver.

Use the Instrument Driver VI Wizard to create an instrument driver VI and insert the VI into the instrument driver project library. Right-click the project library file in the Project Explorer window and select New»Instrument Driver VI from the shortcut menu to launch the Instrument Driver VI Wizard.

6. Related Links

NI-VISA Programming Reference Manual
Instrument Driver Network
Using IVI Drivers in LabVIEW
Getting Started Using National Instruments IVI with LabVIEW or LabWindows/CVI
Using IVI Drivers to Build Hardware-Independent Test Systems with LabVIEW and LabWindows/CVI
Getting Started with Instrument Control

May 2019

This file contains important information about NI-VISA, including supported platforms, new features, information about bug fixes, and known issues for NI-VISA 19.0.

Note: The Measurement Studio VisaNS .NET class library is being deprecated and superseded by an IVI-compliant NI-VISA .NET API. Refer to the New Features section for more information.

If you plan to use LabVIEW NXG, refer to LabVIEW NXG Support and Considerations.

Overview

NI-VISA is the NI implementation of the Virtual Instrument Software Architecture (VISA), a standard for configuring, programming, and troubleshooting instrumentation systems comprising GPIB, VXI, PXI, Serial, Ethernet, and/or USB interfaces.

Supported Operating Systems

NI-VISA 19.0 for Windows supports the following platforms:

• Windows 10 x86, x64
• Windows 8.1¹ x86, x64
• Windows 7 SP1² x86, x64
• Windows Embedded Standard 7 SP1² x86, x64
• Windows Server 2008 R2 SP1 (64-bit version only)³
• Windows Server 2012 R2 (64-bit)^{1, 3}
• NI Real-Time VxWorks
• NI Real-Time Phar Lap ETS
• NI Linux® Real-Time

While this distribution targets all of these platforms, you can run setup.exe only on the Windows variants.

¹ NI software installs VC2015 Runtime and .NET 4.6.2. Windows 8.1 and Windows Server 2012 R2 require Microsoft updates to support these items. Refer to Microsoft KB2919442 and KB2919355 for more information about how to install these updates.

² NI software is signed with a SHA-256 certificate. Windows 7 SP1, Windows Embedded Standard 7 SP1, and Windows Server 2008 R2 SP1 require Microsoft updates to support SHA-256. Refer to Microsoft KB3033929 for more information about how to install this security update.

³ NI-VISA does not support the Windows Server non-R2 editions.

Note Refer to NI-VISA Drops Support for Windows 7 (32- and 64-Bit), Windows Server 2008 R2, and All 32-Bit Windows Operating Systems in 2021 for information about future OS support.

Note In 2016, NI-VISA dropped support for Windows Vista, Windows XP, Windows Server 2003, and installations of Windows 7 without any service packs. NI-VISA 19.0 will not install or run on an unsupported OS. You cannot deploy or distribute applications that use NI-VISA 19.0 to an unsupported OS. Additionally, after installing NI-VISA 19.0, you cannot use any installers built on this computer with any version of LabVIEW, LabWindows™/CVI™, NI TestStand™, or Measurement Studio on an unsupported OS.

For more information about the changes to our OS support for 2016, refer to Why Does My NI ADE Installer Fail on Windows XP/Vista and Windows Server 2003?.

Note Support for Windows 32-bit operating systems may require disabling physical address extension (PAE). To learn how this might affect your system and what actions you might need to take, visit ni.com/info and enter the Info Code PAESupport.

Application Software Support

NI-VISA 19.0 supports the following application software versions, including service packs. If you are not using NI application software, refer to Microsoft Visual Studio Support.

Microsoft Visual Studio Support for the IVI-Compliant NI-VISA .NET Class Library

If you are using the IVI-compliant NI-VISA .NET Class Library, the .NET 4.6.2 Framework (minimum) is required. You can use the NI-VISA .NET Class Library with the Visual C# or Visual Basic .NET programming languages in any Visual Studio version that can target the .NET 4.0 Framework or later. You can use the NI-VISA .NET Class Library in 32-bit or 64-bit applications.

Microsoft Visual Studio Support for the VisaNS .NET Class Library

Note: The Measurement Studio VisaNS .NET Class Library is being deprecated and superseded by an IVI-compliant NI-VISA .NET Class Library. Refer to the New Features section for more information.

The following table lists the programming languages and Microsoft Visual Studio versions supported by this version of the VisaNS .NET Class Library. Earlier versions of NI-VISA support other application software and language versions. For more information on Visual Studio compatibility with earlier versions of VISA, refer to ni.com/info and enter the info code NETlegacydrivers. To find and download an earlier version of a driver, refer to ni.com/downloads.

Installation Instructions

Installing NI-VISA for LabVIEW

You can install all of your LabVIEW products—including NI-VISA—using the LabVIEW 2019 Platform media.

To request additional LabVIEW Platform media, refer to the NI website.

Note

• If Windows Update is enabled, the installation process might hang if Windows Update interferes with the installation of Microsoft Visual C++ 2015 Run-Time. Visit ni.com/info and enter the Info Code exjq43 for more information and steps to resolve this issue.
• If you purchased this product with an NI Software Suite or NI Product Bundle, use the installation media that shipped with your purchase to install this product.

Before you install NI-VISA 19.0, NI recommends that you uninstall any versions of VISA prior to NI-VISA 2.0.1.

After uninstalling NI-VISA, some DLLs and executables may remain in the NI-VISA directories. To complete the uninstall process, you must restart your machine.

Note: The uninstaller application does not notify you when rebooting is necessary. If you plan to reinstall NI-VISA, you always should reboot the machine after running the uninstaller.

Installing NI-VISA for LabVIEW NXG

NI automates LabVIEW NXG installation using NI Package Manager. Visit ni.com/info and enter the Info Code NIPMDownload to download NI Package Manager. Refer to the NI Package Manager Manual for more information about installing, removing, and upgrading NI software using NI Package Manager.

Agilent/HP Controller Support

NI-VISA now works with Agilent/HP GPIB and VXI controller cards. To use this feature, go into MAX, select Tools»NI-VISA»VISA Options, choose the Passports tab, and enable the NiVisaTulip.dll Passport. NI-VISA automatically finds and accesses any GPIB or VXI devices. However, NI-VISA does not configure the Agilent/HP hardware; you still must do that with the Agilent/HP I/O Config utility.

If you have both NI and Agilent/HP controllers in the same system, you must configure the cards at different system addresses, such as GPIB0 and GPIB1. If both vendors try to use the same interface address, NI-VISA reports an error from viFindRsrc or VISA Find Resources.

Creating and Digitally Signing Catalog Files

(Windows 8.1, Windows 10) If you generate an INF file using the NI-VISA Driver Wizard, you must create and digitally sign a Windows Catalog (.cat) file before you can install the INF file on a Windows 8.1 or Windows 10 machine. For more information about digitally signing a .cat file for Windows 8.1 or later, visit ni.com/infoMyriad pro bold condensed. and enter the Info Code INFWin8.

For more information about creating and signing catalog files, Microsoft has a Kernel-Mode Code Signing Walkthrough whitepaper that describes the details of this process. The generated catalog file should reference only the INF file.

Product Security and Critical Updates

Visit ni.com/security to view and subscribe to receive security notifications about NI products. Visit ni.com/critical-updates for information about critical updates from NI.

New Features

NI-VISA 18.5

Added support for LabVIEW NXG 3.0.

NI-VISA 17.5

Added support for LabVIEW NXG 2.0.

NI-VISA 17.0

Dropped support for GPIB-VXI controllers.

NI-VISA 15.5

Updated documentation for NI-VISA .NET API, available in your Users/Public/Documents/National Instruments/NI-VISA/Documentation directory.

Improved performance of viInXX and viOutXX functions.

NI-VISA 15.0

Added support for the industry standard API for VISA .NET as specified by the IVI Foundation in VPP 4.3.6. NI recommends this API for developing new .NET applications using NI-VISA. Support for the legacy VisaNS API will be removed in a future release. For more information about upgrading from VisaNS to the new VISA .NET API, visit ni.com/info and enter the Info Code VISANETUpgrade.

NI-VISA 14.0

Added support for NI Linux Real-Time x64.

Added support for viMapTrigger and viAssertTrigger on PXI resources to use PXI-9 compliant trigger managers if available.

Added support for viGpibControlREN on TCPIP resources that use the VXI-11 protocol.

Known Issues

You can access the software and documentation known issues list online. For a list of known issues with NI-VISA 19.0, refer to the VISA Known Issues page on ni.com.

Bug Fixes

For a list of bug fixes for NI-VISA, visit ni.com/info and enter the Info Code NIVISAFixList.

Accessing the Help

Refer to the NI-VISA Help, accessible from LabVIEW by selecting Help>>LabVIEW Help, for information about NI-VISA.

Finding Examples

Select Help>>Find Examples from LabVIEW to launch the NI Example Finder. LabVIEW examples for NI-VISA are located in the labviewexamplesInstrument IOVISA directory. You can modify an example VI to fit an application, or you can copy and paste from one or more examples into a VI that you create.

LabVIEW NXG Support and Considerations

The following sections detail considerations for using LabVIEW NXG with NI-VISA.

LabVIEW NXG Operating Systems and System Requirements

Software support for LabVIEW NXG differs in the following ways:

• System requirements—Only 64-bit (x64) processors are supported.
• Operating system—Only 64-bit operating systems are supported. Refer to the Supported Operating Systems section for more information.

Installing NI-VISA

NI automates LabVIEW NXG installation using a package manager. Complete the following steps to install NI-VISA for LabVIEW NXG.

1. Visit ni.com/info and enter the info code NXGDownload to access the LabVIEW NXG download page.
2. Click Download LabVIEW NXG.
3. NI Package Manager installs, then automatically opens a download window.
4. Select LabVIEW NXG Suite and click the green Install button.
5. Select LabVIEW NXG 3.0 and NI-VISA.
6. Complete the installer instructions to download LabVIEW NXG 3.0 and NI-VISA.

LabVIEW NXG Help

View context help in LabVIEW by pressing <Ctrl-H> and hovering over an object.

Search for items using the search bar in the upper right corner of the LabVIEW window. You can also view context help for the search results.

Additional documentation is available online at ni.com/manuals.

LabVIEW NXG Examples

Launch LabVIEW and click the Learning tab.

LabVIEW lessons are located in the Lessons tab, and LabVIEW Examples are located in the Examples tab. Follow the instructions in the lessons and examples.

Automating the Installation of NI Products

You can automate the installation of most NI products using command-line arguments to suppress some or all of the installer user interface and dialog boxes. However, starting with the August 2012 releases (products using NI Installers version 3.1 or later), you may need to perform additional steps before or during a silent installation of NI software.

If the NI product you are installing uses Microsoft .NET 4.0, the .NET installer may run before any NI software installs and may require a reboot before the installation of NI software begins. To avoid a .NET reboot, install .NET 4.0 separately before you install NI software.

For more information about automating the installation of NI products, refer to the following KnowledgeBase articles:

• For more information about silent installations of individual NI products, refer to KB 4CJDP38M, Automating the Installation of a Single Installer.
• For more information about silent installations of NI products in a suite, such as NI Developer Suite, refer to KB 4GGGDQH0, How Do I Automate the Installation of a Suited Installer?.
• To determine what version of NI Installers your product contains, refer to KB 4CJDR18M, How Can I Determine the Type and Version of My National Instruments Installer?.

Using NI Software with Microsoft Windows 10

Microsoft Windows 10 is the latest version of the Windows operating system and features significant changes compared to previous versions. Windows 10 introduces several new capabilities and also combines features from both Windows 7 and Windows 8. For more information about NI support for Windows 10, visit ni.com/windows10.

Using NI Software with Microsoft Windows 8.1

When you install NI software on Microsoft Windows 8.1, you will notice a few additional tiles in the Apps view, including shortcuts to NI application software products such as NI LabVIEW, Measurement & Automation Explorer (NI MAX), and NI Launcher. For more information about NI support for Windows 8.1, visit ni.com/windows8.

NI-VISA Drops Support for Windows 7 (32- and 64-Bit), Windows Server 2008 R2, and All 32-Bit Windows Operating Systems in 2021

NI-VISA will drop support for Windows 7 (32- and 64-bit), Windows Server 2008 R2, and all 32-bit Windows operating systems starting in 2021. Versions of this product that ship after May 1, 2021, will not install or run on these operating systems. For detailed information about NI operating system support, visit ni.com/r/win32bitsupport.

For detailed information about NI application software product life cycles, visit ni.com/info and enter one of the following Info Codes:

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End-User License Agreements and Third-Party Legal Notices

You can find end-user license agreements (EULAs) and third-party legal notices in the following locations after installation:

• Notices are located in the <National Instruments>_Legal Information and <National Instruments> directories.
• EULAs are located in the <National Instruments>SharedMDFLegallicense directory.
• Review <National Instruments>_Legal Information.txt for information on including legal information in installers built with NI products.

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Content from the IVI specifications reproduced with permission from the IVI Foundation.

The IVI Foundation and its member companies make no warranty of any kind with regard to this material, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose. The IVI Foundation and its member companies shall not be liable for errors contained herein or for incidental or consequential damages in connection with the furnishing, performance, or use of this material.

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Refer to the NI Trademarks and Logo Guidelines at ni.com/trademarks for information on NI trademarks. Other product and company names mentioned herein are trademarks or trade names of their respective companies.

Patents

For patents covering the NI products/technology, refer to the appropriate location: Help>>Patents in your software, the patents.txt file on your media, or the NI Patent Notice at ni.com/patents.

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