Prosilica GT Technical Manual V2.4.1
72
Camera trigger
Trigger rules
•
The
end of exposure
will always trigger the next readout.
•
The
end of exposure
must always end after the current readout.
•
The
start of exposure
must always correspond with the interline time if
readout is true.
•
Exposure start delay
equals the readout time minus the registered expo-
sure time.
Triggering during the idle state
For applications requiring the shortest possible
Trigger Latency
and the smallest
possible
Trigger Jitter
the
User Trigger
signal should be applied when
Imaging
is
false and
Idle
is true. In this case,
Trigger Latency
and
Trigger Jitter
are as indi-
cated in the camera
Specifications
section.
Triggering during the readout state
For applications requiring the fastest triggering cycle time whereby the camera
image sensor is exposing and reading out simultaneously, apply the
User Trigger
signal as soon as a valid
Trigger Ready
is detected. In this case,
Trigger Latency
and
Trigger Jitter
can be up to 1 row time since
Exposure
must always begin on
an
Interline
boundary.
Trigger latency
Time delay between the user trigger and the start
of exposure
Trigger jitter
Error in the trigger latency time
Trigger ready
Indicates to the user that the camera will accept
the next trigger
Registered exposure time Exposure time value currently stored in the camera
memory
Exposure start delay
Registered exposure time subtracted from the
readout time and indicates when the next exposure
cycle can begin such that the exposure will end
after the current readout
Interline time
Time between sensor row readout cycles
Imaging
High when the camera image sensor is either
exposing and/or reading out data
Idle
High if the camera image sensor is not exposing
and/or reading out data
Note
The
user trigger pulse width
should be at least three times the
width of the trigger latency as indicated in chapter
Term
Definition
Table 25: Explanation of signals in timing diagram
