National Instruments NI Vision NI 17xx 用户手册

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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.

Vision Builder AI and MAX do not support fixed-frame-rate mode.

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 

 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 

 section of 

Chapter 2, 

, 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.