Basler ace acA640-90gm - Page 121

Image Acquisition Control
Basler ace GigE 111
Exposure Active on Rolling Shutter Cameras (acA2500-14 Only)
Cameras with a rolling shutter imaging sensor can provide an "exposure active" (ExpAc) output
signal. On these cameras, the signal goes high when exposure for the first line in a frame begins
and goes low when exposure for the first line ends as shown in Figure 58.
Selecting the Exposure Active Signal as the Source Signal for the Output Line
The exposure active output signal can be selected to act as the source signal for 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 exposure active output 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_ExposureActive );
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 on page 27.
For more information about changing which camera output signal is selected as the source signal
for the output line, see Section 6.2.1 on page 54.
For more information about the electrical characteristics of the camera’s output line, see Section 5.8
on page 47.
Frame Acquisition N Frame Acquisition N+1 Frame Acquisition N+2
= Line Exposure
= Line Readout
Time
Exposure
Active
Signal
Fig. 58: Exposure Active Signal on Cameras with a Rolling shutter