Trigger Wait Signals; Frame Burst Trigger Wait Signal - Basler acA2040-55 User Manual

Image Acquisition Control AW00123409000
6.8.4

Trigger Wait Signals

If a camera receives a hardware frame burst start trigger signal when it is not in a "waiting for frame
burst start trigger" acquisition status, it will simply ignore the trigger signal and will generate a frame
burst start overtrigger event.
If a camera receives 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 frame burst trigger wait signal gives you the ability to check whether the camera is in
a "waiting for frame burst start trigger" acquisition status. If you check the frame burst trigger wait
signal before you apply each hardware frame burst start trigger signal, you can avoid applying
frame burst 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 frame burst start or frame start via
a hardware trigger signal.
6.8.4.1

Frame Burst Trigger Wait Signal

As you are acquiring frames, the camera automatically monitors the frame burst start trigger status
and supplies a signal that indicates the current status. The Frame Burst Trigger Wait signal will go
high whenever the camera enters a "waiting for frame burst start trigger" status. The signal will go
low when an external frame burst start trigger (ExFBSTrig) signal is applied to the camera and the
camera exits the "waiting for frame burst start trigger status". The signal will go high again when the
camera again enters a "waiting for frame burst trigger" status and it is safe to apply the next frame
burst start trigger signal.
If you base your use of the ExFBSTrig signal on the state of the frame burst trigger wait signal, you
can avoid "frame burst start overtriggering", i.e., applying a frame burst start trigger signal to the
camera when it is not in a "waiting for frame burst start trigger" acquisition status. If you do apply a
frame burst start trigger signal to the camera when it is not ready to receive the signal, it will be
ignored and a frame burst start overtrigger event will be reported.
Figure 75 illustrates the Frame Burst Trigger Wait signal with the Acquisition Burst 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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