User`s manual

AW00098504000 Image Acquisition Control
Basler ace Camera Link 109
7.6.3 Exposure Active Signal
The camera can provide an "exposure active" (ExpAc) output signal. The signal goes high when
the exposure time for each frame acquisition begins and goes low when the exposure time ends as
shown in Figure 32. (In this example,the camera is operating in the timed exposure mode.)
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.
Fig. 32: Exposure Active Signal
Frame Acquisition N
Exposure
Readout
Time
Exposure
Active
Signal
Frame Acquisition N+1
Exposure
Readout
Frame Acquisition N+2
Exposure
Readout
ExFSTrig
Signal
= Camera is in a "waiting for
frame start trigger" status