Controlling Image Acquisition With A Hardware Trigger; Exposure Modes - Basler Pioneer User Manual

Image Acquisition Control
10.3 Controlling Image Acquisition
with a Hardware Trigger
You can configure the camera so that an external hardware trigger (ExTrig) signal applied to one of
the input lines will control image acquisition. A rising edge or a falling edge of the ExTrig signal can
be used to trigger image acquisition.
The ExTrig signal can be periodic or non-periodic. When the camera is operating under control of
an ExTrig signal, the period of the ExTrig signal will determine the rate at which the camera is
acquiring images:
1
----------------------------------------------------------------- -
ExTrig period in seconds
For example, if you are operating a camera with an ExTrig signal period of 20 ms (0.020 s):
1
-------------- - = 50 fps
0.020
So in this case, the acquisition frame rate is 50 fps.
In order for the camera to detect a transition from low to high, the ExTrig signal must be held high
for at least 100 nanoseconds. In order for the camera to detect a transition from high to low, the
ExTrig signal must be held low for at least 100 nanoseconds.
By default, input line 1 is assigned to receive an ExTrig signal.
When you are triggering image acquisition with an ExTrig signal, you must not acquire images at a
rate that exceeds the maximum allowed for the current camera settings.
For more information about setting the camera for hardware triggering and selecting the input line
to receive the ExTrig signal, see Section 10.3.2 on
For more information about determining the maximum allowed acquisition frame rate, see
Section 10.9 on page 137.

10.3.1 Exposure Modes

If you are triggering exposure start with an ExTrig signal, two exposure modes are available, "timed"
and "trigger width."
Timed Exposure Mode
When timed mode is selected, the exposure time for each image is determined by the value of the
camera's exposure time parameter. If the camera is set for rising edge triggering, the exposure time
starts when the ExTrig signal rises. If the camera is set for falling edge triggering, the exposure time
120
= Acquisition Frame Rate
page 123.
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