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12.5.3
Features
Free Selection Sequence Advance Mode
When the free selection sequence advance mode is selected the advance from one sequence set
to the next as frame start triggers are received does not adhere to a specific preset sequence: The
sequence sets can be selected at will using the states of input lines: The states of the input lines
set the sequence set addresses. These correspond to the sequence set index numbers and
accordingly, the related sequence set is selected. For details about selecting sequence sets via the
sequence set address, see the "Selecting Sequence Sets" section.
The states of two input lines are checked if more than two sequence sets are available. The states
of one input line is checked when only two sequence sets are available.
The Sequence Set Total Number parameter specifies the total number of different sequence sets
that are available. The maximum number is 4.
12.5.3.1 Operation
Operating the Sequencer
The following use case (see also Figure 64) illustrates the operation of the sequencer in free
selection sequence advance mode.
In this use case, the Sequence Set Total Number parameter was set to four. Accordingly, the
sequence set index numbers range from 0 through 3. Input line 1 sets bit 0 of the sequence set
address. Input line 2 sets bit 1 of the sequence set address. Both input lines are not set for invert.
The frame start trigger is set for rising edge triggering.
Assuming that the camera is in the process of continuously capturing images, the sequencer
feature operates as follows:

When the sequencer feature becomes enabled and a frame start trigger was received, the
camera checks the states of input lines 1 and 2. Input line 1 is found to be high and input line 2
is found to be low. This corresponds to the address of sequence set 1. Accordingly, sequence
set 1 is selected. Its parameter values are loaded into the active set and are used for the image
acquisition.
Note that the state of input line 1 went high well ahead of the frame start trigger.
To ensure reliable selection of a sequence set, allow the elapse of at least one
microsecond between setting the states of the input lines and the rise of the
frame start trigger signal.
Also, maintain the states of the input lines at least for one microsecond after
the frame start trigger signal has risen.
Note also that the camera briefly exits the "waiting for frame start trigger" status while an input
line changes its state. This happened, for example, when input line 1 changed its state before
the first frame start trigger was received (see also Figure 64).
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