Exposure Modes - Basler GIGE VISION ace acA640-100gm/gc Manual

6.4.3.2
If you are triggering the start of frame acquisition with an externally generated frame start trigger
(ExFSTrig) 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 Abs parameter. If the camera is set for rising edge triggering,
the exposure time starts when the ExFSTrig signal rises. If the camera is set for falling edge
triggering, the exposure time starts when the ExFSTrig signal falls. Figure 24 illustrates timed
exposure with the camera set for rising edge triggering.
ExFSTrig Signal
Fig. 24: 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 a Frame Start Overtrigger event will be generated.
This situation is illustrated below for rising edge triggering.
ExFSTrig Signal
Fig. 25: Overtriggering with Timed Exposure
For more information about the Frame Start Overtrigger event, seeSection 10.12 on
For more information about the camera's Exposure Time Abs parameter, see Section 6.5 on
page 70.
Basler ace
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Exposure Modes

ExFSTrig Signal Period
Exposure
(duration determined by the
Exposure Time Absparameter)
Exposure
(duration determined by the
Exposure Time Abs parameter)
Image Acquisition Control
This rise in the trigger signal will be
ignored, and a Frame Start Overtrigger
event will be generated
page 181.
65