imaqIOChangeDetectConfigure

Format

rval = imaqIOChangeDetectConfigure(IMAQIO_SESSION id, IMAQIOSignalType triggerType, unsigned long triggerNumber, IMAQIOChangeDetectMode detectMode, unsigned long filter);

Purpose

Configures the signal state change detector logic of an input line on the NI-IMAQ I/O device. Use this function to arm the detection of rising edges, falling edges, or both on the specified input trigger line.

Parameters

Name	Type	Direction
id	IMAQIO_SESSION	input
triggerType	IMAQIOSignalType	input
triggerNumber	unsigned long	input
detectMode	IMAQIOChangeDetectMode	input
filter	unsigned	input

Parameter Discussion

id is the ID of the session to close.

triggerType is the type of trigger line to detect a change on.

triggerNumber is the trigger number to detect a change on.

detectMode is the change detection mode. This specifies what type of edge to be sensitive to.

filter is used to suppress high-frequency noise from the change detection. After receiving an edge, the trigger line must be held steady in the new logic state for filter × (25) ns in order for the device to register a successful change detection. Set this parameter to 0 to disable filtering.