Image Acquisition Control
Basler scout 111
7.6.3.2 Exposure Modes
If you are triggering the start of frame acquisition with an externally generated acquisition start
trigger (ExASTrig) signal, two exposure modes are available: timed and trigger width.
Timed Exposure Mode
When timed mode is selected, the exposure time for each frame acquisition is determined by the
value of the camera’s exposure time parameters. If the camera is set for rising edge triggering, the
exposure time starts when the ExASTrig signal rises. If the camera is set for falling edge triggering,
the exposure time starts when the ExASTrig signal falls. The following figure illustrates timed
exposure with the camera set for rising edge triggering.
Fig. 49: Timed Exposure with Rising Edge Triggering
Note that if you attempt to trigger a new exposure start while the previous exposure is still in
progress, the trigger signal will be ignored, and an Acquisition Start Overtrigger event will be
generated. This situation is illustrated below for rising edge triggering.
Fig. 50: Overtriggering with Timed Exposure
For more information about the Acquisition Start Overtrigger event, see Section 9.16 on page 235.
For more information about the camera’s exposure time parameters, see Section 7.7 on page 116.
This rise in the trigger signal will be ignored,
and an Acquisition Start Overtrigger event will
be generated
Exposure
(duration determined by the
exposure time parameters)
ExASTrig Signal
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