AW00089317000 Standard Features
Basler ace GigE 241
10.8.2.2 Operation with the Input Line as Sequence Control Source
Operating the Sequencer
When the Line 1 sequence control source is selected the advance from one sequence set to the
next is controlled according to the states of input line 1. The advance proceeds in ascending
sequence set index numbers as frame start triggers are received.
The following use case (see also Figure 100) illustrates the operation of the sequencer in controlled
sequence advance mode with Line 1 selected as the sequence control source. The camera
advances from one sequence set to the next in ascending sequence set index numbers. After one
sequence set cycle is complete, another one starts. The sequence set advance is controlled by the
states of Line 1. Line 1 is not set for invert.
In this use case, the Sequence Set Total Number parameter was set to six. Accordingly, the
available sequence set index numbers range from 0 through 5. 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, the sequence set cycle starts: The parameter
values of the sequence set with sequence set index number 0 are loaded into the active set
modifying the active set.
When a frame start trigger is received, the camera checks the state of input line 1. Input line 1
is found to be low (the line status equals zero) and therefore no new sequence parameter values
are loaded into the active set. The parameter values of sequence set 0 are used for the image
acquisition.
When the next frame start trigger is received, the camera checks the state of input line 1. Input
line 1 is found to be high (the line status equals one) and therefore the parameter values of the
next sequence set are loaded into the active set. The parameter values of sequence set 1 are
used for the image acquisition.
Note that the state of input line 1 went high well ahead of the frame start trigger.
Note that sequence set advance is not influenced by the state of the input line
at the time when the sequencer feature was enabled. For example, had Line 1
been high at the time of the enabling but then become low and remained there
when the first frame start trigger signal was received then sequence set 0 had
been used for the first image acquisition.
To ensure reliable selection of a sequence set, allow the elapse of at least one
microsecond between setting the states of the input line and the rise of the
frame start trigger signal.
Also, maintain the state of the input line at least for one microsecond after the
frame start trigger signal has risen.
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