IVI-C vs IVI-COM | Difference between IVI-C and IVI-COM
This page compares IVI-C vs IVI-COM and mentions difference between IVI-C and IVI-COM.
IVI stands for Interchangeable Virtual Instruments. It is the latest software instrument driver technology developed by National Instruments (NI). It is similar to Labview and Labwindows/CVI.
IVI Foundation has specified specifications for 13 instrument classes including Oscilloscope, signal generator, spectrum analyzer, DC power supply, digital multimeter, AWG/function generator, switch, power meter, frequency counter, digitizer, upconverter, downconverter, AC power supply etc. in order to achieve interchangeability.
Following are the benefits of IVI driver:
• Interchangeability: IVI drivers enable exchange of instruments with minimal code changes and
hence will reduce time as well as effort.
• Ease of Use: One can use preferred ADEs; standard APIs will provide fast, intuitive access to the functions.
• Quality: common commands, desirable options, rigorous testing to ensure driver quality
• Simulation: It allows code development and testing even when instrument is unavailable.
• Performance and reliability: range checking and state caching
In order to use IVI, following minimum softwares are needed.
• Labwindows/CVI 2010
• NI-VISA 5.0
• Agilent 34401A IVI-C Driver
Tabular difference between IVI-C and IVI-COM
Following table mentions difference between IVI-C and IVI-COM drivers developed by National Instruments(NI).
| Features | IVI-C | IVI-COM |
|---|---|---|
| Adoption in IVI spec. | since Aug. 1998 | since Jan. 2003 |
| Source code for message type instruments | Available | Available through custom install |
| Driver tools for development | IVI driver wizard (CVI) | Third party custom tools |
| Stability | Industry proven and based on VXI Plug & Play spec. | Based on Superceded COM |
| Native interface | C, Labwindows, CVI | Visual studio |
| Native Interface via custom wrapper | labview, visual studio | C, Labwindows/CVI |
| IVI based software products | NI switch executive | None |
| Multi-platform capability | Yes | No |
| Interchangeability, Simulation, multithreading | Yes | Yes |
| State caching | on all drivers written by NI | driver supplier dependent |
| Interchange checking | on all drivers written by NI | driver supplier dependent |
| Trace class level calls | Yes (NI I/O Trace) | No |
| Advanced simulation | Yes (NI class simulation drivers) | No |
| support for custom IVI classes | Yes | Yes |
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