The Exposure Active Signal - Basler GIGE VISION ace acA640-100gm/gc Manual

Image Acquisition Control
6.8
The camera's "exposure active" (ExpAc) output signal goes high when the exposure time for each
frame acquisition begins and goes low when the exposure time ends as shown in Figure 37. This
signal can be used as a flash trigger and is also useful when you are operating a system where
either the camera or the object being imaged is movable. For example, assume that the camera is
mounted on an arm mechanism and that the mechanism can move the camera to view different
portions of a product assembly. Typically, you do not want the camera to move during exposure. In
this case, you can monitor the ExpAc signal to know when exposure is taking place and thus know
when to avoid moving the camera.
Exposure
ExpAc
Signal
Fig. 37: Exposure Active Signal
The exposure active output signal can be assigned to camera output line 1. For more information
about changing which camera output signal is assigned to the output line, see Section 9.2.1 on
page 130.
For more information about the electrical characteristics of the camera's output line, see
Section 5.7.2 on
86
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The Exposure Active Signal

Exposure
Frame N
2 µs to3.5 µs
Note
When you use the exposure active signal, be aware that there is a delay in the
rise and the fall of the signal in relation to the start and the end of exposure.
See Figure 37 for details.
page 40.
Exposure
Frame N+1
2 µs to 3.5 µs
10 µs to 26 µs
Timing charts are not drawn to scale
Times stated are typical
Exposure
Frame N+2
10 µs to 26 µs
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