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Internal Timing
The ISC-178x features two types of internally-timed modes: free-run mode and fixed-frame-
rate mode.
In free-run mode, the device acquires images at the maximum frame rate allowed by the
configuration. To operate in free-run mode, the Trigger Mode must be set to Off.
In fixed-frame-rate mode, you can specify a frame rate that is less than or equal to the
maximum frame rate. To operate in fixed-frame-rate mode, the Trigger Source must be set to
Fixed Rate and the Trigger Mode must be set to On. The rate is determined by the minimum of
the specified Acquisition Frame Rate and the Acquisition Frame Rate Limit attributes.
External Trigger
Use a trigger input to synchronize the ISC-178x with an external event, such as the assertion
of a signal generated by a proximity sensor. You can trigger the ISC-178x at rates up to the
maximum frame rate. You can configure external triggering with any of the Input lines or the
software as the trigger source.
Enable triggering with the Input lines as the trigger source in the following software programs:
•
In Vision Builder AI, select the
Enable Trigger
checkbox on the Trigger tab of the
Acquire Image (Smart Camera) step. Then select one of the
Input
lines from the Source
drop-down control.
•
In LabVIEW, set the value of the
Trigger Mode
to ON and the value of the
Trigger
Source
attribute to one of the available Input lines.
•
In MAX, select the
Enable Trigger
checkbox on the Triggering tab of the device
configuration page. Then select one of the
Input
lines from the Source drop-down
control.
Enable triggering with the software as the trigger source in the following software programs:
•
In Vision Builder AI, select the
Enable Trigger
checkbox on the Trigger tab of the
Acquire Image (Smart Camera) step. Then select
Software
from the Source drop-down
control. Use Send Software Trigger to trigger the smart camera.
•
In LabVIEW, set the value of the
Trigger Mode
to ON and the value of the
Trigger
Source
attribute to
Software
.
•
In MAX, select the
Enable Trigger
checkbox on the Triggering tab of the device
configuration page. Then select
Software
from the Source drop-down control. Use Send
Software Trigger to trigger the smart camera.
Related Information
Connecting to Lighting Devices
on page 12
Determining the Maximum Frame Rate
Delay and Activation
The following figure illustrates the relationship between an external trigger, a lightning strobe,
and the exposure time.
ISC-178x User Manual
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© National Instruments
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Содержание ISC-1780
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