IVI driver formats can be IVI-COM for working with COM-based development environments and IVI-C for working in traditional programming languages or IVI.NET for use in a. The IVI Foundation defines a standard driver application programming interface (API) for programmable instruments. The standard mandates that every LXI instrument must have an Interchangeable Virtual Instrument (IVI) driver. They can also be present in test systems which include products based on the GPIB, VXI, and PXI standards. LXI devices can coexist with Ethernet devices that are not themselves LXI compliant. The inclusion of an optional Extended Function based on IEEE 1588 Precision Timing Protocol allows instruments to communicate on a time basis, initiating events at specified times or intervals and time stamping events to indicate when these events occurred in a system. Use of Ethernet allows the simple construction of systems requiring distributed instrumentation systems and control and monitoring systems over large distances, with suitable VPN connections it is possible to connect systems together over inter-continental distances without the use of specialised equipment. Connections to the DUT are permitted to be on the front or the rear to suit market demand, most devices provide front panel connectivity to allow Ethernet and power connections to be provided to the rear panel. LXI products may have no front panel or display, or they may include embedded keyboards and displays. LXI supports synthetic instruments and peer-to-peer networking, providing a number of unique capabilities to the test engineer. LXI products can be modular, rack mounted, bench mounted or take any other physical form. The LXI standard does not define a mechanical format, allowing LXI solutions to take any physical form deemed suitable for products in their intended market. The standard defines how existing standards should be used in instrumentation applications to provide a consistent feel and ensure compatibility between vendors equipment. Proposed in 2005 by Keysight (formerly called Agilent Technologies) and VTI Instruments (formerly called VXI Technology and now part of Ametek), the LXI standard adapts the Ethernet and World Wide Web standards and applies them to test and measurement applications.
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