Discards all pending occurrences of the specified event type and mechanism from the specified session.

This function discards information about all the event occurrences that have not yet been handled. This behavior is useful if you want to remove event occurrences that an operation no longer needs. Discarded event occurrences are not available to a session at a later time.


icon

Inputs/Outputs

  • cvsrn.png VISA resource name —

    VISA resource name specifies the resource to be opened. The VISA resource name control also specifies the session and class.

  • cu32.png event type (all enabled) —

    event type is the logical event identifier.

    You can select from the following VISA event types.

    Service Request0x3FFF200B
    Trigger0xBFFF200A
    Clear0x3FFF200D
    VXI Signal0x3FFF2020
    VXI/VME Interrupt0xBFFF2021
    VXI/VME Sysfail0x3FFF201D
    VXI/VME Sysreset0x3FFF201E
    GPIB CIC0x3FFF2012
    GPIB Talk0x3FFF2013
    GPIB Listen0x3FFF2014
    PXI Interrupt0x3FFF2022
    Serial Break0x3FFF2023
    Serial TermChar0x3FFF2024
    Serial CTS0x3FFF2029
    Serial DSR0x3FFF202A
    Serial DCD0x3FFF202C
    Serial RI0x3FFF202E
    Serial Character0x3FFF2035
    USB Interrupt0x3FFF2037
    All Enabled (default)0x3FFF7FFF

    Refer to the NI-VISA Help for more information about event types.

  • cu16.png mechanism (1: VI_QUEUE) —

    mechanism specifies the event handling mechanism to be disabled.

    Currently only accepts VI_QUEUE (1).

  • cerrcodeclst.png error in (no error) —

    error in describes error conditions that occur before this node runs. This input provides standard error in functionality.

  • ivsrn.png VISA resource name out —

    VISA resource name out is a copy of the VISA resource name that VISA functions return.

  • ierrcodeclst.png error out —

    error out contains error information. This output provides standard error out functionality.

    • Examples

    Refer to the following example files included with LabVIEW.

    • labview\examples\Instrument IO\Serial\Detect Serial Break Event.vi