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Tag: IVI driver

SCPI (Standard Commands for Programmable Instruments) is a standard that defines a language for communicating with instruments based on messages. The majority of the GPIB instruments use the SCPI but also RS-232, Ethernet, VXI, PXI may use it. Several measurement instrument manufacturers have adopted this standard as HP / Agilent for example, allowing some communication uniformity between several devices.

Some examples of SCPI commands:

Instrument identification querry: *IDN? Instrument reset: RST Measure querry: MES?
IVI driver

IVI (Interchangeable Virtual Instrumentation) is a specification of instrument driver published by the IVI Foundation, formed by the biggest names in the instrumentation as Agilent, National Instruments, Rohde & Schwarz, Aeroflex, Tektronix, Teradyne, Pickering and other.

This specification defined instument classes (multimeter, oscilloscope, power supply, ...). All drivers in the same class have the same exported functions. This ensures instruments compatibility and interchangeability: measurement software is linked to the driver class that needle to the specific driver of the used instrument.

Example: I have a test application which measures voltage with a multimeter. My software calls the driver of the multimeter class. IVI refers to the specific driver for the X model from Agilent. Thus, we can change this multimeter by the Y model from Agilent or the Z model from Tektronix  with a simple configuration without modifying the software (for since we have installed the IVI driver of these three instruments).

List of instrument classes defined by IVI:

Digital multimeter (DMM) Oscilloscope Arbitrary waveform/function generator DC power supply AC power supply Switch Power meter Spectrum analyzer RF signal generator Upconverter Downconverter Digitizer Counter/timer Some specific instruments do not fall into this classification. In this case it is possible to create a new class.

LabWindows/CVI provides wizards for developing drivers and adding a new class.

IVI driver scan be called by any type of programming language. However TestStand, LabVIEW, and Measurement Studio can offer all the key functions in hand for their use.

GPIB or IEEE 488 is the specification that defines a parallel bus of digital communication over short distances. It is widely used in industry or scientific research to test applications and able to control instruments (multimeters, oscilloscopes, spectrographs, power ...).
What is Measurement Studio
These are libraries of graphical controls and functions for the rapid development of industrial or laboratory solutions containing .NET technology used directly in Visual Studio, to have power tools National Instruments software and instrumentation functions for C++ , C# or Visual Basic.
What is LabVIEW?

LabVIEW is a development environment specialized in industrial and scientific applications. Its uniqueness is that it relies on the G language, created by National Instruments, which is fully graphical. It can create complex software, while facilitating the programming and thus reduce development time. Through its library of functions for data acquisition, instrumentation, analysis of mathematical measures, but also through the rapid creation of GUIs and coding simplified, the engineer has more time to focus on specific functions of the instrumentation communication and measurement analysis.

LabVIEW is particularly suitable for developing control, supervision, test and measurement systems.

What is TestStand

TestStand is a instruction sequences engine and a development environment for creating a test sequencer evolved several common test for different products. We have a generic software that loads, as the test product, sequences specifying actions, tests and tolerances, and components (such as DLLs) for communication with the hardware.

What is LabWindows/CVI?

LabWindows is a development environment in C language for the implementation of test systems, measurement and instrumentation. Thus, it is possible to enjoy both the power and precision of the C language but also libraries of functions for instrumentation and signal processing from National Instruments.

With LabWindows / CVI, you can develop:

software for Windows (exe) or UNIX Linux, libraries (DLL, Active X,. NET), instrument drivers, on embedded targets, on real-time target. Système de calibrage de sondes de puits de pétrole