User`s manual

Exposure Start and Exposure Time Control
Basler sprint Mono Cameras 67
4 Exposure Start and Exposure
Time Control
This section describes the methods that can be used to trigger the start of exposure and control the
length of exposure for each acquisition. Exposure start and exposure time can be controlled via an
external trigger signal (ExSync) applied to the camera. The camera can also operate in “free run.”
In free run, the camera generates its own internal control signal and does not require an ExSync
signal.
4.1 ExSync Controlled Operation
4.1.1 Basics of ExSync Controlled Operation
In ExSync operation, the camera’s line rate and exposure time are controlled by an externally
generated trigger (ExSync) signal. The ExSync signal is typically supplied to the camera by a frame
grabber board via the Camera Link cable. You should refer to the manual supplied with your frame
grabber board to determine how to set up the ExSync signal that is being supplied to the camera.
When the camera is operating under the control of an ExSync signal, the length of the ExSync
signal period determines the camera’s line rate:
The ExSync signal can be periodic or non-periodic as required.
When the camera is operating with an ExSync signal, three modes of exposure time control are
available: edge controlled mode, level controlled mode, and programmable mode.
 In ExSync edge controlled mode, line acquisition begins on the rising edge of the ExSyc
signal. The pixels are exposed and charge is accumulated over the full period of the ExSync
signal (rising edge to rising edge). The falling edge of the ExSync signal is irrelevant. The pixel
values read out of the sensor on the rising edge of ExSync (see Figure 27).
Line Rate
1
ExSync Period
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