The Acquisition Start Trigger; Acquisition Start Trigger Mode; Acquisition Start Trigger Mode = Off; Acquisition Start Trigger Mode = On - Basler ace acA640-90gm User Manual

7.3

The Acquisition Start Trigger

(When reading this section, it is helpful to refer to Figure 34 on
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. Acquisition start trigger signals can be generated within the camera or may be applied
externally as software or hardware acquisition start trigger signals.
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. In this acquisition status, the camera can react to frame start trigger signals and
will begin to expose a frame each time a proper frame 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" status. Note that this feature only applies when the Trigger
Mode parameter for the acquisition start trigger is set to on. This feature is explained in greater
detail in the following sections.
7.3.1

Acquisition Start Trigger Mode

The main parameter associated with the acquisition start trigger is the Trigger Mode parameter. The
Trigger Mode parameter for the acquisition start trigger has two available settings: off and on.
7.3.1.1

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.
7.3.1.2

Acquisition Start Trigger Mode = On

When the Trigger Mode parameter for the acquisition start trigger is set to on, the camera will initially
be in a "waiting for acquisition start trigger" acquisition status and cannot react to frame start trigger
signals. You must apply an acquisition start trigger signal to the camera to exit the camera from the
"waiting for acquisition start trigger" acquisition status and enter the "waiting for frame start trigger"
acquisition status. The camera can then react to frame start trigger signals and will continue to do
so until the number of frame start trigger signals it has received is equal to the current Acquisition
Basler ace GigE
Image Acquisition Control
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