AW00123402000 Image Acquisition Control
Basler ace USB 3.0 149
Use Case 2 - Frame Burst Start Trigger Off - Frame Start Trigger On
Use case two is illustrated on page 150.
In this use case, the Acquisition Mode parameter is set to continuous. The Trigger Mode parameter
for the frame burst start trigger is set to off and the Trigger Mode parameter for the frame start trigger
is set to on.
Because the frame burst start trigger is set to off, the user does not need to apply frame burst start
trigger signals to the camera. The camera will generate all required frame burst 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 input line 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 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 input 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 forwarded to an image processing
system, which will inspect the image and determine, if there are any defects in the plywood’s
surface.
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