Image Acquisition Control AW00089317000
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7.10.4 Trigger Wait Signals
If a camera receives
a hardware acquisition start trigger signal when it is not in a "waiting for acquisition start
trigger" acquisition status, it will simply ignore the trigger signal and will generate an acquisition
start overtrigger event.
a hardware frame start trigger signal when it is not in a "waiting for frame start trigger"
acquisition status, it will simply ignore the trigger signal and will generate a frame start
overtrigger event.
The camera’s acquisition trigger wait signal gives you the ability to check whether the camera is in
a "waiting for acquisition start trigger" acquisition status.
If you check the acquisition trigger wait signal before you apply each hardware acquisition start
trigger signal, you can avoid applying acquisition start trigger signals to the camera that will be
ignored.
The camera’s frame trigger wait signal gives you the ability to check whether the camera is in a
"waiting for frame start trigger" acquisition status. If you check the frame trigger wait signal before
you apply each hardware frame start trigger signal, you can avoid applying frame start trigger
signals to the camera that will be ignored.
These signals are designed to be used when you are triggering acquisition start or frame start via
a hardware trigger signal.
7.10.4.1 Acquisition Trigger Wait Signal
As you are acquiring frames, the camera automatically monitors the acquisition start trigger status
and supplies a signal that indicates the current status.
The Acquisition Trigger Wait signal will
go high whenever the camera enters a "waiting for acquisition start trigger" status.
go low when an external acquisition start trigger (ExASTrig) signal is applied to the camera
and the camera exits the "waiting for acquisition start trigger status".
go high again when the camera again enters a "waiting for acquisition trigger" status and it is
safe to apply the next acquisition start trigger signal.
If you base your use of the ExASTrig signal on the state of the acquisition trigger wait signal, you
can avoid "acquisition start overtriggering", i.e., applying an acquisition start trigger signal to the
camera when it is not in a "waiting for acquisition start trigger" acquisition status. If you do apply an
acquisition start trigger signal to the camera when it is not ready to receive the signal, it will be
ignored and an acquisition start overtrigger event will be reported.
Figure 76 illustrates the Acquisition Trigger Wait signal with the Acquisition Frame Count parameter
set to 3 and with exposure and readout overlapped on a camera with a global shutter. The figure
assumes that the trigger mode for the frame start trigger is set to off, so the camera is internally
generating frame start trigger signals.
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