8.Features
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Software trigger acquisition features
In software trigger acquisition mode, the camera begins to acquire one image after receiving software
trigger commands. In general, the number of frames is equal to the number of software trigger commands.
The relative features are illustrated below:
1)
In software trigger acquisition mode, if the trigger frequency is lower than permissible maximal FPS
(Frame per Second) of the camera, the current frame rate is trigger frequency. If the trigger frequency
is higher than permissible maximal FPS (Frame per Second) of the camera, some software triggers
are ignored and the current frame rate is lower than trigger frequency.
2)
The trigger delay feature can control the camera delay interval between your triggers and the camera
acquiring frames. The default value of trigger delay time is zero.
8.2.8.
Hardware Trigger Acquisition and Configuration
Hardware trigger acquisition configuration
The camera supports hardware trigger acquisition mode. Three steps followed should be ensured:
1)
Set the Trigger Mode to ON.
2)
Set the Trigger Source to Line0, Line2 or Line3 (for ME2L/ME2S cameras, set the Trigger Source to
Line0 or Line2).
3)
Connect hardware trigger signal to Line0.
If the Trigger Source is set by Line2 or Line3, it should be ensured that the corresponding Line is set as
Input.
Please refer to section 8.1.1 for more information of the camera programmable GPIOs.
Hardware trigger acquisition features
The relative features about the camera's trigger signal process are illustrated below:
1)
The polarity of lines can be set to inverted or not inverted, and the default setting is not inverted.
2)
Improper signal can be filtered by setting appropriate value to trigger filter. Raising edge filter and
falling edge can be set separately. The range is from 0 to 5000 μs. The default configuration is not use
trigger filter.
3)
The time interval between trigger and exposure can be set through the trigger delay feature. The range
of time interval covers from 0 to 3000000μs. The default value of trigger delay time is zero.
The features, like trigger polarity, trigger delay and trigger filter, can be select in the GalaxyView.
The camera's trigger source Line0 uses opto-isolated circuit to isolate signal. Its internal circuit
delay trigger signal and rising edge's delay time is less than falling edge's. There are a dozen clock
cycles delay of rising edge and dozens clock cycles delay of falling edge. If you use Line0 to trigger
the camera, the positive pulse signal's positive width will be wider (about 20μs~40μs) and the
negative pulse signal's negative width will be narrower (about 20μs~40μs). You can adjust filter
parameter to accurately filter trigger signal.
