User`s manual

Image Acquisition Control
Basler aviator Camera Link 79
Use Case 2 - Acquision Start Trigger Off - Frame Start Trigger On
Use case two is illustrated on page 80.
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.
This type of camera setup is used frequently in the real world. 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.