Free Run; Basics Of Free-Run Controlled Operation - Basler A400K User Manual

Basic Operation and Features
Section 4.2.2
field in a CSR. Section

3.3.2 Free Run

3.3.2.1 Basics of Free-run Controlled Operation

In free-run, no ExSync signal is required. The camera generates a continuous internal control
signal. When the camera is operating in free-run, it exposes and outputs frames continuously.
When the camera is operating in free-run, the length of the control signal period determines the
camera's frame rate:
Frame rate
The control signal period is equal to the frame period setting.
When the camera is operating in free-run, it has two modes of exposure time control available:
edge-controlled mode and programmable mode.
• In free-run edge-controlled mode, the camera generates a continuous internal control sig-
nal based on the "Frame Period" parameter. The pixels are exposed and charge is accumu-
lated over the full period of the internal control signal (rising edge to rising edge). The falling
edge of the control signal is irrelevant. The frame is read out and transferred on the rising
edge of the internal control signal (see Figure 3-6).
Figure 3-6: Free-run Edge-controlled Mode
• In free-run programmable mode, the camera generates a continuous internal control signal
based on two programmable parameters: "Exposure Time" and "Frame Period". The Expo-
sure Time setting determines how long the internal control signal will remain low. Pixels are
exposed and charge is accumulated when the internal control signal is low. The Frame
Period setting determines the control signal period. The frame is read out and transferred on
the rising edge of the internal control signal. See Figure 3-7.
3-6
explains CSRs and the difference between using the "raw" field and the "absolute"
4.3.1 explains using read/write commands.
1
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Control signal period
DRAFT
Basler A400k