SVS-Vistek SHR 10GigE, Manual

Page: 59 / 103

5.2.6 Basic capture modes
The camera has 2 basic operation modes.
l
Free run (timed) run: The camera will expose and
deliver images on a fixed schedule.
l
Triggered: The camera will wait for an external
signal and start exposure after receiving the
external trigger signal.
Free running
Free running (fixed frequency) with programmable exposure time. Frames are
readout continuously and valid data is indicated by LVAL for each line and FVAL
for the entire frame.
There is no need to trigger the camera in order to get data. Exposure time is pro-
grammable via serial interface and calculated by the internal logic of the camera.
Fig.: 5-24: Basic capture modes - free running
The fundamental signals are:
l
Line Valid: LVAL, Frame Valid: FVAL,
l
And in case of triggered modes: trigger input.
Triggered mode (pulse width)
External trigger and pulse-width controlled exposure time. In this mode the cam-
era is waiting for an external trigger, which starts integration and readout. Expos-
ure time can be varied using the length of the trigger pulse (rising edge starts
integration time, falling edge terminates the integration time and starts frame read
out). This mode is useful in applications where the light level of the scene
changes during operation. Change of exposure time is possible from one frame to
the next.
Fig.: 5-25: Basic capture modes - triggered mode (pulse width with overlap)
5 Feature description 59