Image Acquisition Control
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7.4 The Frame Start Trigger
The frame start trigger is used to begin frame acquisition. Assuming that the camera is in a "waiting
for frame start trigger" acquisition status, it will begin a frame acquisition each time it receives a
frame start trigger signal.
Note that in order for the camera to be in a "waiting for frame start trigger" acquisition status:
îš„ The Acquisition Mode parameter must be set correctly.
îš„ A proper Acquisition Start command must be applied to the camera.
îš„ A proper acquisition start trigger signal must be applied to the camera (if the Trigger Mode
parameter for the acquisition start trigger is set to on).
For more information about the Acquisition Mode parameter and about Acquisition Start and
Acquisition Stop commands, see Section 7.1 on page 63 and Section 7.2 on page 67.
For more information about the acquisition start trigger, and about the acquisition status, see
Section 7.1 on page 63 and Section 7.3 on page 69.
Referring to the use case diagrams that appear in Section 7.11 on page 123 can help you
understand the explanations of the frame start trigger.
7.4.1 Frame Start Trigger Mode
The main parameter associated with the frame start trigger is the Trigger Mode parameter. The
Trigger Mode parameter for the frame start trigger has two available settings: off and on.
7.4.1.1 Frame Start Trigger Mode = Off
When the Frame Start Trigger Mode parameter is set to off, the camera will generate all required
frame start trigger signals internally, and you do not need to apply frame start trigger signals to the
camera.
With the trigger mode set to off, the way that the camera will operate the frame start trigger depends
on the setting of the camera’s Acquisition Mode parameter:
îš„ If the Acquisition Mode parameter is set to single frame, the camera will automatically generate
a single frame start trigger signal whenever it receives an Acquisition Start command.
îš„ If the Acquisition Mode parameter is set to continuous frame, the camera will automatically
begin generating frame start trigger signals when it receives an Acquisition Start command.
The camera will continue to generate frame start trigger signals until it receives an Acquisition
Stop command.
The rate at which the frame start trigger signals are generated may be determined by the
camera’s Acquisition Frame Rate Abs parameter:
îš„ If the parameter is not enabled, the camera will generate frame start trigger signals at the
maximum rate allowed with the current camera settings.
îš„ If the parameter is enabled and is set to a value less than the maximum allowed frame
rate with the current camera settings, the camera will generate frame start trigger signals
at the rate specified by the parameter setting.
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