AW00123402000 Image Acquisition Control
Basler ace USB 3.0 101
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 Trigger
Source parameter specifies the source signal that will act as the frame start trigger signal. The
available selections for the Trigger Source 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
PC.
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.
If the Trigger Source parameter is set to Line 1, you must also set the Trigger Activation parameter.
The available settings for the Trigger Activation 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 103.
For more information about using a hardware trigger to control frame acquisition start, see
Section 6.4.3 on page 105.
Exposure Time Control with the Frame Start Trigger On
When the Trigger Mode parameter for the frame start trigger is set to on and the Trigger Source
parameter is set to software, the exposure time for each frame acquisition is determined by the
value of the camera’s Exposure Time parameter.
When the Trigger Mode parameter is set to on and the Trigger Source parameter is set to input line
Line 1, the exposure time for each frame acquisition can be controlled with the Exposure Time
parameter or it can be controlled by manipulating the hardware trigger signal.
For more information about controlling exposure time when using a software trigger, see
Section 6.4.2 on page 103.
For more information about controlling exposure time when using a hardware trigger, see
Section 6.4.3 on page 105.
By default, input line Line 1 is selected as the source signal for the frame start
trigger.
Keep in mind that the camera will only react to frame start trigger signals when it
is in a "waiting for frame start trigger" acquisition status. For more information
about the acquisition status, see Section 6.1 on page 85 and Section 6.3 on
page 91.
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