Acquisition Control AW00118303000
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8.2.2 Acquisition Start Triggering
The acquisition start trigger is used in conjunction with the frame start trigger to control the
acquisition of frames. In essence, the acquisition start trigger is used as an enabler for the frame
start trigger.
When the acquisition start trigger is enabled, the camera’s initial acquisition status is "waiting for
acquisition start trigger". When the camera is in this acquisition status, it will ignore any frame start
trigger signals it receives. If an acquisition start trigger signal is applied to the camera, it will exit the
"waiting for acquisition start trigger" acquisition status and enter the "waiting for frame start trigger"
acquisition status. If a frame start trigger signal is applied to the camera, it will exit the "waiting for
frame start trigger" acquisition status and enter the "waiting for line start trigger" acquisition status.
In this acquisition status, the camera can react to line start trigger signals and will begin to expose
a line each time a proper line start trigger signal is applied.
A primary feature of the acquisition start trigger is that after an acquisition start trigger signal has
been applied to the camera and the camera has entered the "waiting for frame start trigger"
acquisition status, the camera will return to the "waiting for acquisition start trigger" acquisition
status once a specified number of frame start triggers has been received. Before more frames can
be acquired, a new acquisition start trigger signal must be applied to the camera to exit it from
"waiting for acquisition start trigger". This feature is explained in greater detail in the following
sections.
There are two main parameters associated with the acquisition start trigger: the Acquisition Start
Trigger Mode parameter and the Acquisition Frame Count parameter.
8.2.2.1 Acquisition Start Trigger Mode = Off
When the Trigger Mode parameter for the acquisition start trigger is set to off, the camera will
generate all required acquisition start trigger signals internally, and you do not need to apply
acquisition start trigger signals to the camera.
8.2.2.2 Acquisition Start Trigger Mode = On
When the Acquisition Start Trigger Mode parameter is set to on, you must apply an acquisition start
trigger to the camera in order to make the camera’s acquisition state valid. Once an acquisition start
trigger has been applied to the camera and the acquisition state has become valid, the state will
remain valid until the camera has acquired the number of frames specified by the Acquisition Frame
Count parameter. At that point, the acquisition state will become invalid, and you must apply a new
acquisition start trigger to the camera before it can acquire any more frames.
When the Acquisition Start Trigger Mode parameter is set to on, you must select a source signal to
serve as the acquisition start trigger. The Acquisition Start Trigger Source parameter specifies the
source signal. The available selections for the Acquisition Start Trigger Source parameter are:
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