NI-VISA 21.0

虚拟仪器软件架构 (VISA)是一种用于配置、编程和故障排除仪器系统的标准，包括 GPIB、VXI、PXI、串行、以太网和/或 USB 接口。VISA 为硬件和开发环境（如 LabVIEW、LabWindows/CVI 和 Measurement Studio for Microsoft Visual Studio）之间提供编程接口。NI-VISA 是 NI 对 VISA I/O 标准的实现。

NI-VISA 包括软件库、交互式实用程序（例如 NI I/O Trace 和 VISA Interactive Control）以及通过 Measurement & Automation Explorer 的配置程序，可满足您的所有开发需求。NI-VISA 是 NI 产品线的标准配置。使用 NI-VISA，您可以确信您的软件开发不会随着仪器接口硬件需求的发展而过时。

背景随着计算机与仪器进行通信的能力，仪器的历史达到了一个里程碑。可编程控制仪器带来了强大的功能和灵活性，能够更快、更准确地控制设备，而无需人工监督。随着时间的推移，LabVIEW 和 LabWindows/CVI 等应用程序开发环境简化了编程任务并提高了生产力，但仪器系统开发人员仍然面临仪器或设备接口总线编程的细节问题。
仪器程序员需要一个软件架构来导出设备的功能，而不仅仅是接口总线。此外，架构需要在设备和接口总线之间保持一致。VISA 库实现了这些目标。它使模型更易于理解，减少了用户需要学习的功能数量，并显着减少了编程不同接口所涉及的时间和精力。无论您的系统使用以太网、GPIB、GPIB-VXI、VXI、PXI 还是串行控制器，您都可以使用 VISA API，而不是使用专用于每个接口总线的不同应用程序编程接口 (API)。
最后，大多数仪器输出一组特定的命令，它们将响应这些命令。这些命令通常是设备的原始功能，需要多个命令将它们组合在一起，以便设备可以执行常见任务。因此，直接与设备通信可能需要以多个命令的形式执行任务 A、执行任务 B 等的大量开销。通过推动 VXI 即插即用系统联盟和 IVI 基金会的成立，National Instruments 已经率先制定了使用 VISA 的更高级别仪器驱动程序的标准。这使得仪器供应商可以更轻松地自己创建仪器驱动程序，从而使仪器系统开发人员不必学习每个设备的原始命令集。

The National Instruments team is pleased to announce the availability of NI-VISA version 21.0.0, 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.

NI-VISA 21.0.0 New Features – Date: June 2021
Added support for LabVIEW NXG 5.1

The Virtual Instrument Software Architecture (VISA) is a standard for configuring, programming, and troubleshooting instrumentation systems comprising GPIB, VXI, PXI, Serial, Ethernet, and/or USB interfaces. VISA provides the programming interface between the hardware and development environments such as LabVIEW, LabWindows/CVI, and Measurement Studio for Microsoft Visual Studio. NI-VISA is the National Instruments implementation of the VISA I/O standard.

NI-VISA includes software libraries, interactive utilities such as NI I/O Trace and the VISA Interactive Control, and configuration programs through Measurement & Automation Explorer for all your development needs. NI-VISA is standard across the National Instruments product line. With NI-VISA, you can feel confident that your software development will not become obsolete as your instrumentation interface hardware needs evolve into the future.

Background The history of instrumentation reached a milestone with the ability to communicate with an instrument from a computer. Controlling instruments programmably brought a great deal of power and flexibility with the capability to control devices faster and more accurately without the need for human supervision. Over time, application development environments such as LabVIEW and LabWindows/CVI eased the task of programming and increased productivity, but instrumentation system developers were still faced with the details of programming the instrument or the device interface bus.
Instrument programmers require a software architecture that exports the capabilities of the devices, not just the interface bus. In addition, the architecture needs to be consistent across the devices and interface buses. The VISA library realizes these goals. It results in a simpler model to understand, reduces the number of functions the user needs to learn, and significantly reduces the time and effort involved in programming different interfaces. Instead of using a different Application Programming Interface (API) devoted to each interface bus, you can use the VISA API whether your system uses an Ethernet, GPIB, GPIB-VXI, VXI, PXI, or Serial controller.
Finally, most instruments export a specific set of commands to which they will respond. These commands are often primitive functions of the device and require several commands to group them together so that the device can perform common tasks. As a result, communicating directly with the device may require much overhead in the form of multiple commands to do task A, do task B, and so on. By driving the formation of the VXIplug&play Systems Alliance and the IVI Foundation, National Instruments has spearheaded standards for higher-level instrument drivers that use VISA. This makes it easier for the vendors of instruments to create the instrument drivers themselves, so that instrumentation system developers do not have to learn the primitive command sets of each device.

Serial communications timeout exception using NI VISA driver with an USB serial adapter.
Since 1976, National Instruments has equipped engineers and scientists with tools that accelerate productivity, innovation and discovery. NI’s graphical system design approach to engineering provides an integrated software and hardware platform that speeds the development of any system needing measurement and control. The company’s long-term vision and focus on improving society through its technology supports the success of its customers, employees, suppliers and shareholders.

Product: NI-VISA
Version: 21.0.0
Supported Architectures: x64
Website Home Page : http://www.ni.com
Languages Supported: multilanguages
System Requirements: PC *
Size: 1.1 Gb