User`s manual

Image Acquisition Control AW00098504000
78 Basler ace Camera Link
7.3 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.
(For a quick overview of acquisition start triggering and frame start triggering, see Section 7.1 on
page 65.)
When reading this section, it is helpful to refer to Figure 20 on page 67 and the use case diagrams
that appear in Section 7.9 on page 121.
7.3.1 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.
7.3.1.1 Frame Start Trigger Mode = Off
When the Trigger Mode parameter for the frame start trigger 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.
If you are using Basler pylon to parameterize the camera, the rate at which the frame start trigger
signals will be generated is determined by the camera’s Acquisition Frame Rate Abs parameter:
 If the parameter is not enabled, the camera will generate frame start trigger signals at the
maximum rate allowed given the current camera settings.
 If the parameter is enabled and is set to a value less than the maximum allowed frame rate, the
camera will generate frame start trigger signals at the rate specified by the parameter setting.
 If the parameter is enabled and is set to a value greater than the maximum allowed frame rate,
the camera will generate frame start trigger signals at the maximum allowed frame rate.
If you are using direct register access to parameterize the camera, the rate at which the frame start
trigger signals will be generated is determined by the camera’s Acquisition Frame Period Raw
parameter (Frame Rate = 1/ Frame Period):
 If the parameter is not enabled, the camera will generate frame start trigger signals at the
maximum rate allowed given the current camera settings.
 If the parameter is enabled and is set to a value that would result in a frame rate less than the
maximum allowed, the camera will generate frame start trigger signals at the rate that results
from the parameter setting.
 If the parameter is enabled and is set to a value that would result in a frame rate greater than
the maximum allowed given the current camera settings, the camera will generate frame start
trigger signals at the maximum allowed frame rate.