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110 Appendix B: Camera interface reference
In this mode, the line scan rate is determined by the time between external trigger
pulses; it can use internal or external exposure time control.
In a variable line scan mode with line and frame triggers, the camera is set to
transmit video-on-demand. The line rate is a function of the line trigger; the frame
capture is initiated by the frame trigger.
Y The required connections when using this mode are frame trigger signal, and the
line trigger signal to frame grabber. To connect the exposure from frame grabber
R to the camera, the synchronization signals from the camera to the frame grabber
or from the frame grabber to the camera (if the camera is in slave mode), and the
video signal from the camera to the frame grabber.
A 5 Fixed line scan rate mode with variable frame size
IN 0 In a fixed line scan rate mode with variable frame size, the line rate is controlled
by the period of the exposure signal. Exposure time can be internal or external.
0 The frame capture is initiated by the frame trigger and the frame size is a function
of the frame triggers active level duration. The number of lines per frame is variable
IM 2 and is controlled by the frame trigger signal.
The frame grabber captures lines during the high level of the frame trigger signal.
The maximum number of lines captured can be adjusted by changing the number
L Y of active lines in the active vertical timing period in the DCF file. The line capture
starts with the rising edge of the frame trigger signal.
E A The required connections when using this mode are the frame trigger and line
trigger signals to frame grabber, and the periodic line resets signal (with optional
exposure) from the frame grabber to the camera. You also need to connect the
R M synchronization signals from the camera to the frame grabber, or from the frame
grabber to the camera. The video signals also needs to be connected from the
P 19camera to the frame grabber.
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