Basler raL2048-48gm Manuel d'utilisateur Page 136

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Acquisition Control AW00118302000
126 Basler racer GigE
8.3.3.1 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. The signal will 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". The signal will 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.
Fig. 45 illustrates the Acquisition Trigger Wait signal with the Acquisition Frame Count parameter
set to 2, with the lines per frame (Height) set to 3, and with exposure and readout overlapped. The
figure assumes raising edge triggering and that the trigger mode for the frame start trigger and for
the line start trigger is set to off, so the camera is internally generating frame and line start trigger
signals.
The acquisition trigger wait signal can be selected as the source signal for one of the output lines
on the camera.
For more information about selecting the source signal for an output line on the camera, see
Section 7.6.2.5 on page 68.
For more information about the electrical characteristics of the camera’s output lines, see
Section 7.6.2.1 on page 64.
For more information about event reporting, see Section 10.4 on page 171.
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