V

variant

A generic LabVIEW data type that can accept any other LabVIEW datatype. The data of a variant, is both the data and type information of data type that it "wraps".

VI

See virtual instrument.

VI Description

A documentation string that describes the functionality of a VI. It is intended to help LabVIEW programmer understand how a VI works.

VI Hierarchy

The entire set of all VIs that are subVIs (recursively) of a Top-Level VI.

VI History

The history of comments, if provided, for all revisions to a VI.

VI Property

A VI Server Property, which is accessible via a Property Node, for the VI class. See also: VI Server, Property Node.

VI Server

A feature in LabVIEW that allows you to programmatically and remotely control the behavior of VIs and controls.

virtual channel

Defines a real-world measurement consisting of one or more DAQ channels (terminals on your DAQ device) along with other channel specific informationrange, terminal configuration, and custom scalingthat is used to format the data.

virtual instrument

LabVIEW program; so called because it models the appearance and function of a physical instrument.

VISA

Virtual Instrument Standard Architecture. A driver software framework that unifies instrumentation software standards, whether the instrument uses GPIB, PXI, VXI, or Serial (RS-232/422/485).

VISA Resource

A string, used by the VISA framework, that specifies the physical address of a device.

VXI

VME eXtensions for Instrumentation. A very high-performance system for instrumentation.