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Posted : admin | On 30-03-2021

An instrument driver, in the context of test and measurement (T&M) application development, is a set of software routines that simplifies remote instrument control. Instrument drivers are specified by the IVI Foundation[1] and define an I/O abstraction layer using the virtual instrument software architecture (VISA). The VISA hardware abstraction layer provides an interface-independent communication channel to T&M instruments. Furthermore, the instrument drivers encapsulate the Standard Commands for Programmable Instruments (SCPI) commands, which are an ASCII-based set of commands for reading and writing instrument settings and measurement data. This standard allows an abstract way of using various programming languages to program remote-control applications instead of using SCPI commands. An instrument driver usually has a well-defined API.

Standards[edit]

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VXIplug&play instrument driver[edit]

The VXIplug&play Systems Alliance was founded in 1993[2] with the aim of unifying VXI hardware and software to achieve 'plug and play' interoperability for VXI and GPIB instruments. As part of the unifying process, VXIplug&play instrument drivers[3] were also defined.

IVI instrument drivers[edit]

When the IVI Foundation took over the Alliance in 2002, it defined a new generation of instrument drivers to replace the VXIplug&play standard. The IVI instrument driver specification intends to overcome the drawbacks of VXIplug&play. These IVI (Interchangeable Virtual Instrumentation) drivers[4] are currently defined in three different architectures:

  1. The IVI-COM driver architecture[5] is based on the Microsoft Component Object Model.
  2. The IVI-C drivers are based on C programming language shared components (shared libraries).
  3. The IVI.NET driver architecture was specified in 2010.[5][6] The IVI.NET drivers are based on the .NET framework.

Remote control of instrumentation[edit]

Instrument drivers allow quicker development of remote-control applications for instrumentation. The drivers reduce the difficulty of string formatting when using SCPI commands by providing a well-defined API. The IVI and VXIplug&play Instrument Drivers use the VISA as the hardware abstraction layer so that hardware-independent applications can be developed.

I/O hardware abstraction layer VISA[edit]

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The VISA library allows test and measurement equipment to be connected through various hardware interfaces. The following interfaces are available:

  • GPIB/IEEE-488
  • VXI-11[7] (over TCP/IP)
  • USB488/USBTMC (USB Test & Measurement), USB Test & Measurement Class Specification[8]
  • HiSLIP[9] (over TCP/IP).
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LXI[edit]

The LAN eXtensions for Instrumentation (LXI) standard defines the communications protocols for controlling test and measurement systems using Ethernet. The standard requires vendors to offer IVI compliant instrument drivers.

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See also[edit]

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References[edit]

  1. ^'IVI Foundation Specifications'. IVI Foundation.
  2. ^'VXIplug&play Alliance'. IVI Foundation.
  3. ^'VPP-3.1: Instrument Drivers Architecture an Design Specification'(PDF). IVI Foundation.
  4. ^'IVI Driver Specifications'. IVI Foundation.
  5. ^ ab'IVI-3.1: Driver Architecture Specification'(PDF). IVI Foundation.
  6. ^'IVI-3.18: IVI.NET Utility Classes and Interfaces Specification'(PDF). IVI Foundation.
  7. ^'VXI-11 Bus Specification'. VXI Bus Consortium.
  8. ^'USB Test & Measurement Class Specification'. USB Implementers Forum Inc. Archived from the original on 2010-03-26.
  9. ^'IVI-6.1: High-Speed LAN Instrument Protocol (HiSLIP)'(PDF). IVI Foundation.

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External links[edit]

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