Table Of Contents

DAQmx Timing (Change Detection) (G Dataflow)

Last Modified: February 6, 2017

Configures the task to acquire samples on the rising and/or falling edges of the lines or ports you specify.

To detect both rising and falling edges on a line or port, wire the name of that line or port to both rising edge physical channels and falling edge physical channels.

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task in

task in is the name of the task that the operation applies.

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rising edge physical channels

rising edge physical channels specifies the names of the digital lines or ports on which to detect rising edges. The DAQmx physical channel constant lists all lines and ports for devices installed in your system.

You also can wire a string that contains a list or range of digital lines or ports to this input.

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falling edge physical channels

falling edge physical channels specifies the names of the digital lines or ports on which to detect falling edges. The DAQmx physical channel constant lists all lines and ports for devices installed in your system.

You also can wire a string that contains a list or range of digital lines or ports to this input.

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error in

error in describes error conditions that occur before this node runs. This input provides standard 'error in' functionality.

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sample mode

sample mode specifies if the task acquires samples continuously or if it acquires a finite number of samples.

Name Description
Continuous Samples

Acquire samples until DAQmx Stop Task runs.

Finite Samples

Acquire a finite number of samples.

Hardware Timed Single Point

Acquire samples continuously using hardware timing without a buffer. Hardware timed single point sample mode is supported only for the sample clock and change detection timing types.

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samples per channel

samples per channel specifies the number of samples to acquire from each channel in the task if sample mode is Finite Samples. This node returns an error if the specified value is negative.

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task out

task out is a reference to the task after this node runs.

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error out

error out contains error information. If error in indicates that an error occurred before this node ran, error out contains the same error information. Otherwise, error out describes the error status that this node produces.

Where This Node Can Run:

Desktop OS: Windows

FPGA: LabVIEW NXG does not support FPGA devices


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