Basler SCOUT LIGHT User Manual download pdf (Page 69)

Image Acquisition Control

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6.8 Exposure Active Signal

The camera’s “exposure active” (ExpAc) signal goes high when the exposure time for each image

acquisition begins and goes low when the exposure time ends as shown in Figure 24. 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. 24: Exposure Active Signal

By default, the ExpAc signal is assigned to physical output line 1 on the camera. However, the

assignment of an output signal to the camera’s physical output line can be changed.

For more information about changing the output signal assigned to the camera’s output line, see

Section 8.2 on page 88.

For more information about the electrical characteristics of the camera’s output line, see

Section 5.7.3 on page 34.

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 24 for details.

Exposure

Frame N

Exposure

Frame N+1

Exposure

Frame N+2

Exposure

ExpAc

Signal

2 - 3.5 µs

10 - 26 µs

2 - 3.5 µs

10 - 26 µs

Timing charts are not drawn to scale

Times stated are typical

1 2 ... 64 65 66 67 68 69 70 71 72 73 74 ... 165 166

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Basler SCOUT LIGHT User Manual Page 69