AW00011916000 Image Acquisition Control
Basler scout GigE 125
For more information about setting the camera for hardware acquisition start triggering and
selecting the input line to receive the ExFSTrig signal, see Section 9.4.5.2 on page 117.
For more information about the electrical requirements for input lines 1 and 2, see Section 7.7.1 on
page 84.
For more information about determining the maximum allowed frame rate, see Section 9.13 on
page 167 and Section 9.14 on page 171.
9.5.3.2 Exposure Modes
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
camera’s exposure time parameters. 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. The following figure illustrates timed exposure
with the camera set for rising edge triggering.
Fig. 48: 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.
If you are triggering frame acquisition with an ExFSTrig signal and you attempt to
acquire frames at too high a rate, some of the frame trigger signals that you apply
will be received by the camera when it is not in a "waiting for frame start trigger"
acquisition status. The camera will ignore any frame start trigger signals that it
receives when it is not "waiting for frame start trigger". This situation is commonly
referred to as "over triggering" the camera.
To avoid over triggering, you should not attempt to acquire frames at a rate that
exceeds the maximum allowed with the current camera settings.
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