IVI-C vs. IVI-COM: Key Differences in Instrument Driver Technologies

This article explores the distinctions between IVI-C and IVI-COM, two driver technologies developed by National Instruments (NI) within the framework of Interchangeable Virtual Instruments (IVI). IVI, a software instrument driver technology, aims to facilitate instrument interchangeability, similar to the principles behind LabVIEW and LabWindows/CVI. The IVI Foundation has established specifications for 13 instrument classes, including oscilloscopes, signal generators, and more, to achieve this goal.

Benefits of IVI Drivers

IVI drivers offer several key advantages:

• Interchangeability: Easily swap instruments with minimal code modifications, saving time and effort.
• Ease of Use: Utilize your preferred Application Development Environments (ADEs) with standard APIs for quick and intuitive access to functions.
• Quality: Benefit from common commands, desirable options, and rigorous testing to ensure driver reliability.
• Simulation: Develop and test code even when the physical instrument is unavailable.
• Performance and Reliability: Leverage range checking and state caching for improved performance and reliability.

Minimum Software Requirements for IVI

To effectively use IVI, ensure you have the following minimum software installed:

• LabWindows/CVI 2010
• NI-VISA 5.0
• Agilent 34401A IVI-C Driver

IVI-C vs. IVI-COM: A Detailed Comparison

The following table outlines the key differences between IVI-C and IVI-COM drivers:

This table highlights that while both IVI-C and IVI-COM serve the purpose of instrument control, they differ significantly in their implementation and characteristics. IVI-C, being the older and more mature technology, boasts features like robust stability and a wider range of tools. On the other hand, IVI-COM utilizes COM architecture, providing specific advantages in certain development environments.