Basler raL2048-48gm Manuel d'utilisateur télécharger pdf (Page 138)

Acquisition Control AW00118302000

128 Basler racer GigE

Selecting the Acquisition Trigger Wait Signal as the Source Signal

for the Output Line

The acquisition trigger wait signal can be selected to act as the source signal for e.g. camera output

line 1. Selecting a source signal for the output line is a two step process:

 Use the Line Selector to select output line 1.

 Set the value of the Line Source Parameter to the acquisition trigger wait signal.

You can set the Line Selector and the Line Source parameter value from within your application

software by using the Basler pylon API. The following code snippet illustrates using the API to set

the selector and the parameter value:

Camera.LineSelector.SetValue( LineSelector_Out1 );

Camera.LineSource.SetValue( LineSource_AcquisitionTriggerWait );

You can also use the Basler pylon Viewer application to easily set the parameters.

For more information about the pylon API and the pylon Viewer, see Section 3.1 on page 23.

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 line, see

Section 7.6.2.1 on page 64.

8.3.3.2 Frame Trigger Wait Signal

As you are acquiring frames, the camera automatically monitors the frame start trigger status and

supplies a signal that indicates the current status.

The Frame Trigger Wait signal will go high whenever the camera enters a "waiting for frame start

trigger" status. The signal will go low when an external frame start trigger (ExFSTrig) signal is

applied to the camera and the camera exits the "waiting for frame start trigger status". The signal

will go high again when the camera again enters a "waiting for frame trigger" status and it is safe to

apply the next frame start trigger signal.

If you base your use of the ExFSTrig signal on the state of the frame trigger wait signal, you can

avoid "frame start overtriggering", i.e., applying a frame start trigger signal to the camera when it is

not in a "waiting for frame start trigger" acquisition status. If you do apply a frame start trigger signal

to the camera when it is not ready to receive the signal, it will be ignored and a frame start

overtrigger event will be reported.

Fig. 46 illustrates the Frame Trigger Wait signal 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 acquisition start trigger and for the line start trigger is set to off, so the camera is

internally generating acquisition and line start trigger signals.

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Basler raL2048-48gm Manuel d'utilisateur Page 138