User`s manual

36 Piranha4 4K and 2K Dual Line Monochrome CMOS Camera User's Manual
03-032-20176-02 Teledyne DALSA
Trigger Modes
The camera‘s image exposures are initiated by a trigger event. The trigger event is either a programmable
internal signal used in free running mode, an external input used for synchronizing exposures to external
triggers, or a programmed function call message by the controlling computer. These triggering modes are
described below.
 Internal trigger (trigger disabled): The camera free-running mode has a programmable internal
timer for line rate and a programmable exposure period.
 External trigger (trigger enabled): Exposures are controlled by an external trigger signal. The
external trigger signal is the Camera Link control line CC1.
Exposure Controls
The Exposure Control modes define how and when the camera will capture an image—the integration
period. The integration period is the amount of time the camera’s sensor is exposed to incoming light
before the captured image is transmitted to the controlling computer.
 Exposure control is defined as the start of exposure and exposure duration.
 The start of exposure can be an internal timer signal (free-running mode) or an external trigger
signal.
 The exposure duration can be programmable (such as the case of an internal timer) or controlled by the
external trigger pulse width.
The camera can grab images in one of three ways. You determine the three imaging modes using a
combination of the Exposure Mode parameters (including I/O parameters), Exposure Time and Line Rate
parameters.
Description
Line Rate
Exposure Time
Trigger Source
(Sync)
Internal line rate and exposure time
Internal, programmable
Internal programmable
Internal
External line rate and exposure time
Controlled by EXSYNC
pulse
External (EXSYNC)
External
EXSYNC pulse controlling the line
rate. Programmed exposure time.
Controlled by EXSYNC
pulse
Internal programmable
External
Figure 19. Exposure controls
The parameters used to select the imaging modes—trigger sources (sync), exposure time, and line rate—
are grouped together as the Camera Controls.
Camera Controls
Parameter
Description
Line Rate (in Hz)
Camera line rate in Hz. Only available when the start line trigger parameter
is disabled (Trigger Mode off).
Exposure Mode
Set the operation mode for the camera‘s exposure.
Trigger Width or Timed. Trigger Width is only available when Trigger
Mode is enabled.
Trigger Width
Uses the width of the current line trigger signal pulse to control the