Standard Features AW00089317000
244 Basler ace GigE
10.8.2.3 Operation with the "Disabled" Sequence Control Source
Operating the Sequencer
When the Disabled sequence control source is selected the advance from one sequence set to the
next proceeds in ascending sequence set index numbers and is only possible by asynchronous
avance.
Similarly, sequence set restart is only possible by asynchronous restart.
The following use case (see also Figure 101) illustrates the operation of the sequencer in controlled
sequence advance mode with Disabled selected as the sequence control source. Sequence set
advance proceeds in ascending sequence set index numbers subject to asynchronous advance
commands. After one sequence set cycle is complete, another one starts. Sequence set cycle
restarts are subject to asynchronous restart commands.
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 active set and uses it for the
image acquisition. The parameter values of sequence set 0 are used.
An AsyncAdvance command is sent. After some delay, the parameter values of the next
sequence set will be loaded into the active set. It is assumed here that the delay between
sending the AsyncRestart command and it becoming effective will allow the acquisition of two
more images.
When the next frame start trigger is received, the camera checks the active set and uses it for
the image acquisition. The parameter values of sequence set 0 are used.
The AsyncAdvance command has not yet become effective because of the assumed
associated delay.
When the next frame start trigger is received, the camera checks the active set and uses it for
the image acquisition. The parameter values of sequence set 0 are used.
The delay between sending an AsyncAdvance or an AsyncRestart software
command and it becoming effective will depend on the specific installation and the
current load on the network. Accordingly, the number of image acquisitions that
may occur between sending the software command and it becoming effective can
not be predicted. Using the sequencer feature with Disabled sequence control
source is therefore not suitable for real-time applications, it may, however, be
useful for testing purposes.
We strongly recommend not to use the sequencer feature with Disabled
sequence control source for real-time applications.
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