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AW00011916000 Image Acquisition Control
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9.6.2 Using a Software Acquisition Start Trigger
(Legacy Mode)
9.6.2.1 Introduction
If the Trigger Mode parameter for the acquisition start trigger is set to on and the Trigger Source
parameter is set to software, you must apply a software acquisition start trigger signal to the camera
to begin each frame acquisition. Assuming that the camera is in a "waiting for acquisition start
trigger" acquisition status, frame exposure will start when the software acquisition start trigger signal
is received by the camera. Figure 47 illustrates frame acquisition with a software acquisition start
trigger signal.
When the camera receives a software trigger signal and begins exposure, it will exit the "waiting for
acquisition start trigger" acquisition status because at that point, it cannot react to a new acquisition
start trigger signal. As soon as the camera is capable of reacting to a new acquisition start trigger
signal, it will automatically return to the "waiting for acquisition start trigger" acquisition status.
When you are using a software trigger signal to start each frame acquisition, the camera’s Exposure
Mode parameter must be set to timed. The exposure time for each acquired frame will be
determined by the camera’s exposure time parameters.
Fig. 51: Frame Acquisition with a Software Acquisition Start Trigger
When you are using a software trigger signal to start each frame acquisition, the frame rate will be
determined by how often you apply a software trigger signal to the camera, and you should not
attempt to trigger frame acquisition at a rate that exceeds the maximum allowed for the current
camera settings. (There is a detailed explanation about the maximum allowed frame rate at the end
of this chapter.) Software acquisition start trigger signals that are applied to the camera when it is
not ready to receive them will be ignored.
Section 9.5.2.2 on page 123 includes more detailed information about applying a software
acquisition start trigger to the camera using Basler pylon.
For more information about determining the maximum allowed frame rate, see Section 9.13 on
page 167 and Section 9.14 on page 171 .
For more information about exposure time parameters, see Section 9.7 on page 141 .
Exposure
(duration determined by the
exposure time parameter)
Software Acquisition Start
Trigger Signal Received
Frame
Acquisition
Exposure
Software Acquisition Start
Trigger Signal Received