Basler ace acA1920-155, User Manual, Page: 230 / 326

Features AW00123404000
220 Basler ace USB 3.0
Trigger Sources for Synchronous Sequencer Set Advance
When triggers are applied from synchronous trigger sources, the advance from one sequencer set
to the next will be closely tied to the frame start triggers:

When frame start trigger is the trigger source, the next sequencer set will be immediately
loaded into the active set as soon as a frame start trigger occurs and applied to the image
acquisition. Only available for path 1.

When Line 1 (dedicated input line) or Line 3 or Line 4 (GPIO lines set for input) is the trigger
source and when the related trigger signal occurs the signal will go high and thereby select the
next sequencer set for sequencer set advance. When a subsequent frame start trigger occurs,
the state of the trigger signal for sequencer set advance is evaluated. As the level will be high,
the related sequencer set is loaded into the active set and is applied to the image acquisition.

The Counter 2 End trigger source is useful when you want that a user set is applied to a
number of consecutive image acquisitions.
Counter 2 End refers to Counter 2 that counts consecutive frame start triggers. When Counter
2 End is the trigger source, advance to the next sequencer set will only be possible after
Counter 2 has reached the set Counter Duration value. The counting starts from 1 to the set
Counter Duration value and will then resume again from 1. The Counter Duration value can be
set to an integer value between 1 and 256. The trigger source is generated within the camera.
Only available for path 1.
You can achieve operation with tightly constrained timing between sequencer set advance and
frame start triggers if you use an external signal for the frame start triggers and use the "fast" GPIO
lines, Line 3 and Line 4, as trigger sources for paths 0 and 1. The timing will be even tighter
constrained if you use one GPIO line as trigger source for path 0 and the other GPIO line as the
trigger source for both, frame start trigger and path 1 triggering. In this case, you would ideally use
the falling edges of the GPIO input signals as they are the "fast" edges.
See Section 5.10 on page 69 for information about making optimum use of the temporal
performance of the GPIO lines. See Section 5.9 on page 63 about the limitations of use of GPIO
lines in an environment with significant electromagnetic interference.