Trigger Mode - WolfVision EYE-12 Bedienungsanleitung

Trigger Port
This is very useful for surveillance and machine vision applications. For example a light barrier can
simultaneously send out a trigger pulse to the EYE-12 and to a harddisc recorder when someone enters a
room. Most recording devices can not start recording in a fraction of a second. If the camera would output a
live image, a later image would be recorded, which does not show the exact situation anymore. But as the
trigger function freezes the image output by the EYE-12, the exact image is recorded.
NORMAL MODE (Free Running)
In normal mode (Trigger is de-activated by default) the camera generates live images with a frame rate of
30 fps. The duration of exposure can be changed in the on-screen menu with the shutter setting. The
sampling time is controlled by the camera electronic and can not be changed.

TRIGGER MODE

The EYE-12 offers a trigger input to determine the moment of image readout.
When the TRIGGER-function is activated, the sampling time is controlled by receiving trigger-pulses
(positive or negative edge, selectable in the on-screen menu - see page 10).
The image is processed 1/30s after the camera receives the trigger pulse.
The exposure time is variable and determined by the shutter time. However, the end of exposure is always
1/30s after the trigger pulse. The start of exposure is also determined by the shutter time (Shutter is
adjustable in the on-screen menu).
Example with positive trigger edge
ready for next trigger
1/30s 1/30s 1/30s
t = Exposure time t = frame rate
exp ro
Trigger_in
3.3 - 40 Vss
Exposure
Image readout
Please note:
The maximum trigger frequency is 15Hz (2x 1/30s). This will result in a maximum frame rate of 15fps.
Please note:
When switching on the Trigger mode in the on-screen menu, the EYE-12 freezes the current image. The
next image will be processed when the EYE-12 receives a trigger pulse.
Please note:
When the time between the trigger pulses are too short, the message "Trigger Overrun" will appear on the
screen. Decrease the trigger pulse frequency to rectify this.
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