VISA Enable Event Function

LabVIEW 2014 Help

Edition Date: June 2014

Part Number: 371361L-01

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Owning Palette: Event Handling VIs and Functions

Requires: Base Development System

Enables notification of a specified event type.

Note  You must call the VISA Enable Event function for a session before using the VISA Wait on Event function.


VISA resource name specifies the resource to be opened. The VISA resource name control also specifies the session and class.
event type is the logical event identifier. You can select from the following VISA event types.

Service Request (default)0x3FFF200B
VXI Signal0x3FFF2020
VXI/VME Interrupt0xBFFF2021
VXI/VME Sysfail0x3FFF201D
VXI/VME Sysreset0x3FFF201E
GPIB Talk0x3FFF2013
GPIB Listen0x3FFF2014
PXI Interrupt0x3FFF2022
Serial Break0x3FFF2023
Serial TermChar0x3FFF2024
Serial CTS0x3FFF2029
Serial DSR0x3FFF202A
Serial DCD0x3FFF202C
Serial RI0x3FFF202E
Serial Character0x3FFF2035
USB Interrupt0x3FFF2037
All Enabled0x3FFF7FFF

Refer to the NI-VISA Help for more information about event types.
mechanism specifies the event handling mechanism to be disabled. Currently only accepts VI_QUEUE (1).
error in describes error conditions that occur before this node runs. This input provides standard error in functionality.
VISA resource name out is a copy of the VISA resource name that VISA functions return.
error out contains error information. This output provides standard error out functionality.


Refer to the following VIs for examples of using the VISA Enable Event function:

  • Detect Serial Break Event VI: labview\examples\Instrument IO\Serial
  • SRQ Event Handling VI: labview\examples\Instrument IO\GPIB


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