Photon Focus MV8-D8424-G01-GT, User Manual, Page: 32 / 139

4 Image Acquisition
4.4 Exposure Control
E x p o s u r e C o n t r o l
E x p o s u r e S t a r t T r i g g e r
E x p o s u r e E n d T r i g g e r
E x p o s u r e A c t i v e
E x p o s u r e S t a r t
E x p o s u r e E n d
Figure 4.8: Exposure Control Block
A frame consists of an exposure cycle and an image read out. The exposure control block takes
care of the exposure cycle. The camera has two modes of exposure time operations, which are
defined by the exposure mode settings:
• Timed Exposure
• Trigger Controlled Exposure
4.4.1 Exposure Mode
The exposure mode configuration defines, if the exposure time is controlled by the exposure
time registers or by the triggers. Following configurations are available:
Timed Exposure The exposure time is defined by the exposure time register. The value will
determine the exposure time for each frame.
Trigger Controlled Exposure The exposure time is controller by exposure start and exposure
end triggers (see Section 4.4.2 and Section 4.4.3 for more information).
4.4.2 Exposure Start Trigger
The exposure start trigger is used to start an exposure.
Exposure Start Trigger Mode = on As soon as a exposure start trigger has been received, the
camera starts with the exposure cycle, which is showed by the "Exposure Active" status.
The exposure remains until an exposure end trigger has been received (see Section 4.4.3).
The camera is ready to process exposure start triggers, when the acquisition is active,
showed by the "Acquisition Active" status, and when the "Frame Trigger Wait" status is
asserted.
Exposure Start Trigger Mode = off
The exposure start triggers are ignored.
The exposure start 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".
4.4.3 Exposure End Trigger
The exposure end trigger is used to terminate an active exposure cycle.
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