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
LXI Wired Trigger Bus
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
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
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.