User`s manual

AW00098504000 Image Acquisition Control
Basler ace Camera Link 123
Use Case 2 - Acquisition Start Trigger Off - Frame Start Trigger On
Use case two is illustrated on page 124.
In this use case, the Trigger Mode parameter for the acquisition start trigger is set to off and the
Trigger Mode parameter for the frame start trigger is set to on.
Because the acquisition start trigger is set to off, the user does not need to apply acquisition start
trigger signals to the camera. The camera will generate all required acquisition start trigger signals
internally.
Because the frame start trigger is set to on, the user must apply a frame start trigger signal to the
camera in order to begin each frame exposure. In this case, we have set the frame start trigger
signal source to line 1 and the activation to rising edge. So, the rising edge of an externally
generated electrical signal applied to line 1 will serve as the frame start trigger signal.
(Note that the GPIO line is designated as line 1 and in this case it has been set to act as in input
line.)
This type of camera setup is used frequently in industrial applications. One example might be a
wood products inspection system used to inspect the surface of pieces of plywood on a conveyor
belt as they pass by a camera. In this situation, a sensing device is usually used to determine when
a piece of plywood on the conveyor is properly positioned in front of the camera. When the plywood
is in the correct position, the sensing device transmits an electrical signal to line 1 on the camera.
When the electrical signal is received on line 1, it serves as a frame start trigger signal and initiates
a frame acquisition. The frame acquired by the camera is transmitted to an image processing
system that will inspect the image and determine if there are any defects in the plywood’s surface.