© National Instruments
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5-3
NI 17xx Smart Camera User Manual
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 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.
Figure 5-1 illustrates the relationship between an external trigger, a lighting strobe, and the
exposure time.
Figure 5-1.
Externally Triggered Mode
The trigger shown in Figure 5-1 represents an external trigger, configured to use the rising edge
as the active edge. The time between the active edge of the trigger and the assertion of the
lighting strobe is a user-configurable trigger delay. The trigger delay can be configured in either
milliseconds or quadrature encoder counts. The NI 1722 does not support quadrature encoders.
1
User-Configurable Trigger Delay
2
Lighting Turn-On Time
3
Beginning of Image Readout
Trigger
Lighting
S
tro
b
e
Expo
su
re
Im
a
ge Re
a
do
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t
3
2
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Summary of Contents for ISC-1762
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