SetTrigger Method

From NI Vision for Visual Basic

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SetTrigger Method

Syntax

CWIMAQ.SetTrigger Line, Action, Polarity

Return Type

Long

This method returns 0 on success, a negative number on an error, and a positive number on a warning.

Purpose

Obsolete—Use CWIMAQSignals instead.

Sets the action and polarity for a trigger line.

Remarks

Call this method to configure the specified trigger with an action and a polarity. To configure the CWIMAQ control to begin acquisition on a trigger, set the StartCondition property to cwimaqHardwareTrigger.

Note This method returns an error if you use it to set a fifth RTSI line while four are already in use.

NI-IMAQ 1.5 does not support using a trigger to start an asynchronous acquisition. If you are using NI-IMAQ 1.5, always use the AcquireImage method to begin your triggered acquisition. Future versions of NI-IMAQ do support triggered asynchronous acquisitions using the Start method.

Parameters

Line As CWIMAQTriggerLines

Trigger line.

Action As CWIMAQTriggerActions

Trigger action.

Polarity As CWIMAQTriggerPolarities

Trigger polarity.

SetTrigger Method