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LXI Extended Functions

LXI Device Specification 2011 Version 1.4 is defined as a set of “Core” features and optional Extended Functions, which have replaced the Class model in previous versions. Each extension has conformance requirements in addition to the base class. An LXI device can include one or more of the following Extended Functions:

LXI Wired Trigger Bus

LXI Web Interface

The LXI Wired Trigger Bus (WTB) is a hard-wired interface to specify input or output configurability, wired-OR, and shielding and cabling for the most demanding triggering applications.
This method of triggering increases your accuracy to the nanosecond range compared to software triggering via the LAN, which is typically in the millisecond range.

LXI Event Messaging

With LXI Event Messaging, an LXI Event message containing triggering information (including a timestamp) is sent directly from one device to another via the LAN, without computer intervention, which improves execution speed. LAN-based triggers provide programmatically triggered events through driver commands from the controller to the LXI device or by message exchange between LXI devices. They emulate traditional hardware triggers but can carry information that hardware triggers cannot such as trigger slope and time stamps based on synchronized system clocks.

LXI Clock Synchronization

LXI clock synchronization inherits IEEE 1588-2008, a protocol used to synchronize real-time clocks with sub microsecond accuracy in devices of a networked distributed system. This allows common timer events to be tied to absolute times for very precise triggering and synchronization and also enables the correlation between instruments in order to aid monitoring and debugging.

LXI Timestamped Data

LXI Timestamping enables the capability of marking a LAN event at a point in time – events such as triggering, measuring, or connecting channels. You can understand what happened in time sequence in your test programs.

LXI Event Logs

The LXI Event Log utility contains records of LAN events that have occurred, permitting observation of an instrument – or of an entire system – in action. The event log helps you understand what is happening in your instrument or system.


The HiSLIP Extended Function leverages the HiSLIP standard created by the IVI Foundation to create a fast control interface, extend the features provided by VXI-11 (refer to section 4.1 Software Overview for more details), and emulate the capabilities of GPIB devices. HiSLIP also operates over IPv6 networks.


The world is being forced to adopt IPv6 as IPv4 address spaces on the Internet run out. The IPv6 Extended Function has been adopted by the LXI Consortium to ensure that the LXI vendors approach IPv6 in a consistent way before its widespread use in test systems occurs and ensuring products can comply with government requirements for IPv6 readiness.