JAI CV-A1-20 - Manual (Page 16)

CV-A1-20
6.9. Start/Stop Mode
The exposure is controlled by the interval between the external trigger pulse and an external VD
pulse. The exposure start at the first HD pulse after the trigger leading edge, and it stops after
the rising edge of the VD. An EEN pulse will indicate the active accumulation time, and a WEN
pulse indicates that the resulting video is being read out.
The shortest exposure time in this mode is >1.3H.
The longest exposure time is <2000 H.
To use this mode:
Set function:
Trigger mode “Start/Stop Mode” TR = 5
Polarity and other functions
Input: Ext. trigger to pin 5 on 6-pin connector (or pin 11 on 12-pin con.).
Ext. VD to pin 7 on 12-pin connector.
Ext. HD to pin 6 on12-pin connector. (If used).
Important notes on using this mode.
• The start of exposure will start synchronized to the internal H signal. The start may be
shifted max 1H. To avoid this shift (1 H jitter), synchronize the camera to an external HD
and make sure that the trigger pulse aligns to the HD as shown in fig. 17.
• The duration of the trigger should be >1H.
• A new trigger must not be applied before WEN is high.
• In trigger modes there are no continuous VD out, only after each trigger input.
1H = 83.6 µs
No equalize and serration pulses.
Fig. 24. Start/Stop mode
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