Operation and Features
3-8 BASLER L304kc
Draft
3.3.2 Free Run
3.3.2.1 Basics of Free-run Controlled Operation
In free-run, an ExSync signal is not required. The camera generates its own internal control signal
based on two programmable parameters, “Line Period” and “Exposure Time.” The camera’s
internally generated control signal rises and falls in a fashion similar to an ExSync signal.
In free-run, the camera exposes and outputs lines automatically and the line period parameter
setting determines the camera’s line rate:
In free-run, two modes of operation are available: edge-controlled and programmable.
•In free-run edge-controlled mode, the pixels are exposed and charge is accumulated over
the full line period (from rising edge to rising edge of the internal control signal). The falling
edge of the control signal is irrelevant. The lines are read out and transferred on the rising
edge of the internal control signal (see Figure 3-6). The line period is determined by the set-
ting for the line period parameter.
The edge-controlled mode will give you the best performance in terms of signal-to-noise ratio.
Figure 3-6: Free-run, Edge-controlled Mode
Line Rate
1
Line period
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