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4.4 Exposure Control
Exposure End Trigger Mode = on An activated exposure cycle will be terminated and the
image read out will be started, as soon as an exposure end trigger has been received. The
"Exposure Active" status goes to inactive. Exposure end triggers are only processed, when
an exposure start trigger has started a trigger controlled exposure cycle previously.
Exposure End Trigger Mode = off The exposure end triggers are ignored.
The exposure end trigger is only available, when the exposure mode is set to
"trigger controlled". The camera sets the trigger modes of this trigger automat-
ically to on, when the exposure mode is set to "trigger controlled" and vice versa
to off when the exposure mode is set to "timed".
Fig. 4.9 shows procedure of a trigger controlled exposure mode. The Acquisition start trigger
mode is off. The camera goes directly into status "Frame Trigger Wait" once the acquisition
status has been executed. An exposure of a new frame is started as soon as an exposure start
trigger has been received. The exposure ends with an exposure end trigger.
A
c q u i s i t i o n A c t i v e
F r a m e A c t i v e F r a m e T r i g g e r
W a i t F r a m e T r i g g e r
W a i t F r a m e T r i g g e r
W a i t
A c q u i s i t i o n S t a r t ( ) A c q u i s i t i o n S t o p ( )
E
x p o s u r e 1 R e a d O u t 1
F r a m e 1
E x p o s u r e S t a r t
T r i g g e r 1 E x p o s u r e E n d
T r i g g e r 1
F r a m e A c t i v e
E x p o s u r e 2 R e a d O u t 2
F r a m e 2
E x p o s u r e S t a r t
T r i g g e r 2 E x p o s u r e E n d
T r i g g e r 2
E x p o s u r e
A c t i v e E x p o s u r e
A c t i v e
A c q u i s i t i o n S t a r t T r i g g e r M o d e = O f f
A c q u i s i t i o n E n d T r i g g e r M o d e = O f f
F r a m e S t a r t T r i g g e r M o d e = O f f
F r a m e B u r s t S t a r t T r i g g e r M o d e = O f f
E x p o s u r e M o d e = T r i g g e r C o n t r o l l e d
Figure 4.9: Trigger Controlled Exposure Mode
4.4.4 Exposure Control Output Signals
The frame control block has the following output signals:
Exposure Active An asserted exposure active signal indicates, that an exposure time of a
current frame is active.
Exposure Start The exposure start is an event, which is generated, when a new exposure time
has been started.
Exposure End The exposure end is an event, which is generated, when a currently running
exposure time is finished.
Exposure active status signal is routed to the I/O control block and can there be selected for
output on the physical output line or on one of the available leds. Exposure start and exposure
end event can be used to trigger or to control other function in the camera, like acquisition,
frame and exposure control or counter and timer.
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