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Chapter 5 Image Acquisition
© National Instruments Corporation 5-3 NI 17xx Smart Camera User Manual
In fixed-frame-rate mode, you can specify a frame rate that is less than or
equal to the maximum frame rate by setting the Frame Rate property in
LabVIEW. Setting the Frame Rate property will implicitly take you out of
free-run mode and into fixed-frame-rate mode. To return to free-run mode,
set the Fixed-Frame-Rate Mode property in LabVIEW to FALSE.
Note Vision Builder AI and MAX do not support fixed-frame-rate mode.
External Trigger
Use the trigger input to synchronize the NI Smart Camera with an external
event, such as the assertion of a signal generated by a proximity sensor.
You can trigger the smart camera at rates up the maximum frame rate.
Refer to the Maximum Frame Rate section for information about factors
that affect the maximum frame rate.
To use an external trigger, the trigger signal must be provided on the
TrigIn/IsoIn(0)+ and TrigIn/IsoIn(0)– inputs to the camera and triggering
must be enabled in the software. Refer to the Isolated Inputs section of
Chapter 2, Power and I/O, for information about connecting external
signals.
You can enable triggering in the following software programs:
• Vision Builder AI—Select the Triggered Acquisition checkbox on
the Trigger tab of the Acquire Image (Smart Camera) step.
• LabVIEW—Use the IMAQ Configure Trigger 3 VI.
• MAX—Select the Enable Trigger checkbox on the Triggering tab of
the smart camera configuration page.