User`s guide

6 Acquiring Image Data
6-8
Specifying the Trigger Type
In this section...
“Comparison of Trigger Types” on page 6-8
“Using an Immediate Trigger” on page 6-9
“Using a Manual Trigger” on page 6-11
“Using a Hardware Trigger” on page 6-14
“Setting DCAM-Specific Trigger Modes” on page 6-17
Comparison of Trigger Types
To specify the type of trigger you want to execute, set the value of the TriggerType
property of the video input object. You must use the triggerconfig function to set the
value of this property. The following table lists all the trigger types supported by the
toolbox, with information about when to use each type of trigger.
Comparison of Trigger Types
TriggerType Value TriggerSource and
TriggerCondition Values
Description
'immediate' Always 'none' The trigger occurs automatically,
immediately after the start function is
issued. This is the default trigger type. For
more information, see “Using an Immediate
Trigger” on page 6-9.
'manual' Always 'none' The trigger occurs when you issue the
trigger function. A manual trigger can
provide more control over image acquisition.
For example, you can monitor the video
stream being acquired, using the preview
function, and manually execute the trigger
when you observe a particular condition in
the scene. For more information, see “Using a
Manual Trigger” on page 6-11.
'hardware' Device-specific Hardware triggers are external signals that
are processed directly by the hardware. This