Dalsa Calibir GXM640 User Manual page 64

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When a valid trigger is received, the next available frame is acquired and any subsequent
triggers received before the start of the frame are ignored. Image metadata includes a
timestamp of the trigger that initiated the acquisition; refer to the Metadata section for
more information.
External trigger
on camera GPIO
Line1 (input)
Valid trigger
event
An invalid frame (rejected) trigger counter is available, in the Event Control feature
category, that counts the frame triggers occurring in an invalid trigger region. To monitor
the counter, select Invalid Frame Trigger (InvalidFrameTrigger) using the Event Statistic
Selector (eventStatisticSelector) feature and read the Event Count (eventStatisticCount)
feature. Alternatively, the invalid frame counter is also available in the image metadata;
refer to the Metadata section for more information.
64  Features and Configuration Options
Min pulse width: configurable through parameter lineDebouncingPeriod.
Shorter pulses are ignored by the camera.
Time = rising edge of external trigger + lineDebouncingPeriod
(the earliest time at which the trigger can be considered valid)
Calibir GXM640 IR Camera User's Manual