Free Run; Basics Of Free-Run Controlled Operation - Basler L100k User Manual

Operation and Features

3.2.2 Free Run

3.2.2.1 Basics of Free-run Controlled Operation

In free-run, no ExSync signal is required. The camera generates a continuous internal control
signal based on two programmable parameters: "Timer 1" and "Timer 2". Timer 1 determines how
long the internal signal will remain low and Timer 2 determines how long the signal will remain
high.
When the camera is operating in free-run, the length of the control signal period determines the
camera's line rate. The control signal period is equal to Timer 1 plus Timer 2:
When the camera is operating in free-run, it exposes and outputs lines continuously.
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 period of the internal control signal (rising edge to rising edge). The falling edge of the
control signal is irrelevant. The line is read out and transferred on the rising edge of the inter-
nal control signal (see Figure 3-5).
In this mode, the exposure time is the sum of Timer 1 plus Timer 2:
Internal
Control
Signal
Figure 3-5: Free-run, Edge-controlled Mode
3-6
DRAFT
Timer 1 + Timer 2 = Control signal period
Timer 1 + Timer 2
Control Signal Period
Timer 2
= ---------------------- -
Line rate
1
= Exposure = ---------------------- -
Line rate
Exposure
Timer 1
1
line read out
BASLER L100
k Series