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
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
, 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.