Frame Start Trigger Mode = On - Basler acA2040-55 User Manual

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If the parameter is enabled and is set to a value greater than the maximum allowed frame

rate with the current camera settings, the camera will generate frame start trigger signals at
the maximum allowed frame rate.
Keep in mind that the camera will only react to frame start triggers when it is in a
"waiting for frame start trigger" acquisition status. For more information about the
acquisition status, see Section 6.1 on
Exposure Time Control with the Frame Start Trigger Off
When the Trigger Mode parameter for the frame start trigger is set to off, the exposure time for each
frame acquisition is determined by the value of the camera's ExposureTime parameter.
For more information about the camera's ExposureTime parameter, see Section 6.5 on
6.4.1.2

Frame Start Trigger Mode = On

When the Trigger Mode parameter for the frame start trigger is set to on, you must apply a frame
start trigger signal to the camera each time you want to begin a frame acquisition. The
TriggerSource parameter specifies the source signal that will act as the frame start trigger signal.
The available selections for the TriggerSource parameter are:
Software - When the source signal is set to software, you apply a frame start trigger signal to

the camera by executing a Trigger Software command for the frame start trigger on the host
computer.
Software Signal 1, Software Signal 2, Software Signal 3 (the latter is not available on

acA1920-155, acA2040-55, acA2040-120, acA2440-35, and acA2440-75 cameras) – Specific
software commands, analogous to the Software command.
Line 1 – When the source signal is set to Line 1, you apply a frame start trigger signal to the

camera by injecting an externally generated electrical signal (commonly referred to as a
hardware trigger signal) into physical input line Line 1 on the camera.
Line 3 – Analogous to the Line 1 source signal. However, the GPIO line Line 3 must be

configured for input.
Line 4 – Analogous to the Line 3 source signal.
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If the Trigger Source parameter is set to Line 1, Line 3 or Line 4 you must also set the
TriggerActivation parameter. The available settings for the TriggerActivation parameter are:
Rising Edge – specifies that a rising edge of the electrical signal will act as the frame start

trigger.
Falling Edge – specifies that a falling edge of the electrical signal will act as the frame start

trigger.
For more information about using a software trigger to control frame acquisition start, see
Section 6.4.2 on page
Basler ace USB 3.0
126.
Image Acquisition Control
page 109 and Section 6.3 on page 115.
page 139.
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