Free Run; Basics Of Free-Run Controlled Operation - Basler L800k User Manual

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Operation and Features

3.4.2 Free Run

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 continuously and the line period parameter

setting determines the camera's line rate:

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 line is read out and transferred on the rising edge

of the internal control signal (see Figure 3-5). The line period is determined by the setting for

the line period parameter.

The edge-controlled mode will give you the best performance in terms of signal-to-noise ratio.

Figure 3-5: Free-run, Edge-controlled Mode

• In free-run, programmable mode, the pixels are exposed and charge is accumulated when

the internal control signal is low. The line is read out and transferred on the rising edge of the

internal control signal (see Figure 3-6).

In this mode, the line period is determined by the setting for the line period parameter. The

exposure time parameter setting determines how long the control signal will be low and thus

determines the exposure time.

Figure 3-6: Free-run, Programmable Mode

3-8

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Line period

BASLER L800

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