User`s manual

Exposure Start and Exposure Time Control
Basler sprint Mono Cameras 71
4.2 Free Run
4.2.1 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 continuously 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, line acquisition begins on the rising edge of the internal
control signal. 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 pixel values are read out of the sensor on the rising edge of the internal control
signal as shown in Figure 30. The line period is determined by the setting for the line period
parameter.
Fig. 30: Free Run, Edge Controlled Mode
Line Rate
1
Line Period
------------------------------=
Line Period
Exposure
Line Readout
Internal
Control
Signal