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CV-L105
6.2.4. External Trigger. Shutter mode.
In this mode, the camera requires an EXT TRIG signal to be issued to the camera. The trigger
signal is typical taken from an encoder. The scanning time is equal to the trigger interval. The
exposure time is equal to the trigger low period (pulse width). For every EXT TRIG input negative
going edge an integration period starts. It is terminated and charge is read out on the trigger
positive going edge. The exposure time is therefore independant of the line rate.
SHUTTER and SCAN parameters has no function here.
The permitted range for the trigger interval is >2120 clk to ∞.
Max scan rate is 14285 lines per second.
To use this mode:
Set function: Trigger External
Mode SHUTTER
SHUTTER value No function
SCAN value No function
Clock, Binning and other functions
Input: Ext. trigger through the LVDS connector
Important notes on using this mode:-
• It is only recommended to use this mode when there is not change of speed in the object
being scanned. If the speed of the object changes, the exposure time change.
• Do not apply a new trigger before the previous result has been read out. >2120 clk.
30 MHz 1t=33.3 ns
15 MHz 1t=66.6 ns
Value in ( ) is for Binning
Fig. 15. Timing for external trigger shutter mode
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