Basler ace acA1920-155, Руководство пользователя, Страница: 244 / 326

Features AW00123404000
234 Basler ace USB 3.0
Use Case 2 - Sequencer Set Advance Based on Counter 2 End, One Reset
Use case two is illustrated in Figure 89 on page 238 and assumes that the following sequencer-
related parameter values are set.
Use Case Two in Overview
Use case two demonstrates synchronous triggering and cycling through all the available four
sequencer sets based on the Counter 2 End trigger source. An addition, one reset of the cycling
occurs.
Sequencer set triggering according to path 0 is controlled by an external trigger via GPIO line
Line 3, configured for input.
In this use case, the cycling through the sequencer sets according to path 1 is based on the
Counter 2 End trigger source that in turn, is based on Counter 2 and its Counter Duration setting.
The cycling is synchronous because the counting of Counter 2 is linked to the frame start triggers:
When a sequencer set has Counter 2 End as the trigger source for sequencer set advance, the
related frame start triggers will be counted by Counter 2 and the sequencer set will be applied to
the frame acquisitions. The same sequencer set will be applied to the following frame acquisitions
until the set end of Counter 2 counting is reached. The end of counting is set by the Counter
Duration parameter value applicable to Counter 2. When the end is reached, the counting will
resume with number one for the next frame start trigger and will apply to the next sequencer set.
As the receding series of frame acquisitions, before, the new series of frame acquisitions will be
subject to Counter 2 counting and the Counter Duration parameter value.
Sequencer Set-related Settings Sequencer
Set 0
Sequencer
Set 1
Sequencer
Set 2
Sequencer
Set 3
Path 0 First sequencer set of path 0** 0** 0** 0**
Next sequencer set after current one 0** 0** 0** 0**
Trigger source Line 3 (GPIO) Line 3 (GPIO)* Line 3 (GPIO)* Line 3 (GPIO)*
Trigger activation Level High** Level High** Level High** Level High**
Path 1 First sequencer set of path 0** 0** 0** 0**
Next sequencer set after current one 1** 2** 3** 0
Trigger source Counter 2 End Counter 2
End*
Counter 2
End*
Counter 2
End*
Counter Duration 1 1 2 1
Trigger activation Level High** Level High** Level High** Level High**
Table 42: Settings for Sequencer Operation According to Use Case 2.
* Only one trigger source for a path allowed.
**Applies Always, Not Only in this Example