Dalsa Xtium-CL MX4 - Figure 17: Synchronization Signals for a 10 Line Virtual Frame; Figure 18: Line Scan, Fixed Frame, no Trigger; Figure 19: Line Scan, Fixed Frame, Edge Trigger; Synchronization Signals for Fixed Frame Length Acquisition

58 • Xtium-CL MX4 Reference Xtium-CL MX4 User's Manual
LVAL
Notes:
• In this example -- 10 lines are acquired
• The Maximum frame rate = Max. Line Rate / nb lines (Hz)
• In / Out signal reference is relative to frame grabber
Video Line
Camera
Control
Shaft Encoder
Virtual Frame
Trigger
In
In
In
In
Out
10 Lines
Acquired
n Lines
Ignored
Figure 17: Synchronization Signals for a 10 Line Virtual Frame
Synchronization Signals for Fixed Frame Length Acquisition
A trigger event is only generated when a grab is active; when not grabbing no trigger events are
generated. When a frame is complete, the frame grabber checks for the specified active trigger
level and, if present, grabs the next frame; otherwise, it waits for the next detected active trigger
level.
In the following diagrams:
“T” indicates a valid external trigger event (SapAcquisition::EventExternalTrigger).
“Ignored” is an ignored event (SapAcquisition::EventExternalTriggerIgnored).
such that
Ignored + T = total triggers received by frame grabber
Frame Valid
Grab Start
Illegal Grab Start
Figure 18: Line scan, Fixed Frame, No Trigger
Frame Valid
Trigger
T
T T
Ignored
Grab Start
Figure 19: Line scan, Fixed Frame, Edge Trigger