Input triggers have some special considerations
when using the new Edit LUT Feature. As previously noted, Pattern 3 (“Matt”)
has an input trigger associated with it. When a trigger is added to a pattern, the
pattern preceding it, Pattern 2 (“Sue”) in this case, has an all-black pattern
loaded at the very end of it so that while the sequence is waiting for the trigger
it does not have a pattern displaying during the wait. This attribute follows
Pattern 2 during a reorder. In our example the first entry (Pattern 2) in the new
display order has a 105 µs dark pattern at the end of it. If Pattern 0 ("Bob") is
placed in front of Pattern 3 ("Matt" - the triggered pattern) then the last
bit-pattern of Pattern 0 (“Bob”) continues to display in our new display order while
waiting for the trigger in Pattern 3 (“Matt”).
The unwanted trigger behavior can be compensated for by one the following
methods:
- Method 1: Consider Pattern 2 and 3 ("Sue" and "Matt") as a set that
must always be moved together in your new display order.
- - Method 1 is the simplest, but the tradeoff is that these two
patterns are not separable without the undesired trigger behavior
described above.
- Method 2: Add a 1-bit all-black pattern with the shortest duration
allowed (105 µs) preceding the trigger pattern. Now consider this pattern
and the triggered pattern following it as a set that must always be moved
together.
- - Method 2 is more versatile, but the pattern set must always
contain a triggered pattern.
- Method 3: Add a 1-bit all-black pattern with the shortest duration
allowed (105 µs) followed by a triggered 1-bit all-black pattern (also with
105 µs duration), and remove the trigger from the actual pattern of
interest. These two patterns are now a versatile trigger set that can be
used repeatedly wherever a trigger is desired. Note that since the
triggered pattern is black, even if your exposure integration begins with
the triggered black pattern there is no light contributing to your
exposure.
- - Method 3 is the most versatile since this standalone trigger set
only has to be placed in the Pattern Index set (on the Pattern Mode
page) once but can be used in many positions when defining a new
display order.