Image Acquisition Control AW00089317000
86 Basler ace GigE
Applying Trigger Signals
The paragraphs above mention "applying a trigger signal". There are two ways to apply an
acquisition start or a frame start trigger signal to the camera:
via software or
via hardware.
To apply trigger signals
via software, you must first select the acquisition start or the frame start trigger and then
indicate that software will be used as the source for the selected trigger signal. At that point,
each time a Trigger Software command is executed, the selected trigger signal will be applied
to the camera.
via hardware, you must first select the acquisition start or the frame start trigger and indicate
that input line 1 will be used as the source for the selected trigger signal. At that point, each
time a proper electrical signal is applied to input line 1, an occurrence of the selected trigger
signal will be recognized by the camera.
The Trigger Selector
Many of the parameter settings and the commands that apply to the triggers have names that are
not specific to a particular type of trigger, for example, the acquisition start trigger has a mode
setting and the frame start trigger has a mode setting. But in Basler pylon there is a single
parameter, the Trigger Mode parameter, that is used to set the mode for both of these triggers. Also,
the Trigger Software command can be executed for either the acquisition start trigger or the frame
start trigger.
Whenever you want to work with a specific type of trigger, your first step is to set the Trigger Selector
parameter to the trigger you want to work with (either the acquisition start trigger or the frame start
trigger). At that point, the changes you make to the Trigger Mode, Trigger Source, etc., will be
applied to the selected trigger only.
Exposure Time Control
When a frame start trigger signal is applied to the camera, the camera will begin to acquire a frame.
A critical aspect of frame acquisition is how long the pixels in the camera’s sensor will be exposed
to light during the frame acquisition.
If the camera is set for
software frame start triggering, a parameter called the Exposure Time Abs will determine
the exposure time for each frame.
hardware frame start triggering, there are two modes of operation: "timed" and "trigger
width".
With the "timed" mode, the Exposure Time Abs parameter will determine the exposure time
for each frame.
With the "trigger width" mode, the way that you manipulate the rise and fall of the
hardware signal will determine the exposure time. The "trigger width" mode is especially
useful,if you want to change the exposure time from frame to frame.
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