AW00118508000 Acquisition Control
Basler racer Camera Link 73
6.2.1 Guidelines for Overlapped Operation
To ensure smooth line acquisition and avoid overtriggering, you may only apply a line acquisition-
related trigger when the camera is waiting for it. If the trigger is nonetheless applied, the trigger will
be ignored and considered an overtrigger.
The risk of overtriggering exists particularly for overlapped operation where the sequence of line
start triggers must be carefully coordinated both with the camera’s exposure time and the sensor
readout time.
The following examples use a non-inverted, rising edge hardware line start trigger signal
(ExLSTrig).
6.2.1.1 Illegal Line Acquisition by Overtriggering
Certain attempts of triggering overlapped line acquisition are illegal and do not result in line
acquisitions: When a line start trigger signal attempts an illegal line acquisition the trigger signal will
be ignored and, accordingly, no line acquisition will be performed. In addition, the trigger signal will
be reported as an overtrigger (see also Section 8.10.2 on page 135). Illegal triggering and
impossible overlaps are shown in Fig. 23 on page 74 and Fig. 24 on page 74.
Illegal triggering when overlapping line acquisitions:
The line start trigger goes high to start the exposure for line acquisition N+1 before the
exposure or the exposure overhead for line acquisition N has ended (see Fig. 23 on page 74).
This would result in the illegal overlap of exposures or of exposure and exposure overhead.
The line start trigger goes low to end the exposure for line acquisition N+1 before readout for
acquisition N has ended (premature exposure end; see Fig. 24 on page 74).
This would result in the illegal overlap of two readouts (in trigger width exposure mode only).
The exposure overhead (see Fig. 23 on page 74) is part of every exposure
process. For simplicity, it is omitted from the other figures illustrating exposure
and readout (see, for example, Fig. 24 on page 74).
The duration of the exposure overhead is expressed by constant C
1
(see also
Section 6.2.1.2 on page 75 and Section 6.4.1 on page 89).
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