User`s guide

7 Using Events and Callbacks
occurred. For information about the information associated with specific
events, see the following sections:
• “Data Fields for Start, Stop, Frames Acquired, and Trigger Events” on
page 7-8
• “Data Fields for Error Events” on page 7-8
• “Data Fields for Timer Events” on page 7-9
Data Fields for Start, Stop, Frames Acquired, and Trigger
Events
For start, stop, frames acquired, and trigger events, the Data structure
contains these fields.
Field Name Description
AbsTime
Absolute time the event occurred, returned in
MATLAB
clock format
[year month day hour minut e seconds]
FrameMemoryLimit
Amount of memory allotted for frame storage. You can
specify this value using the
imaqmem function.
FrameMemoryUsed
Amount of frame memory that is currently in use
FrameNumber
Frame number relative to when the object was started
RelativeFrame
Frame number relative to the execution of a trigger
TriggerIndex
Trigger the event is associated with. For ex ample,
upon start, the associated trigger is 0. Upon stop, it is
equivalent to the
TriggersExecuted property.
Data Fields for E rror Events
Forerrorevents,theData structure contains these fields.
7-8