Table Of Contents

DAQmx Read (Samples) (G Dataflow)

Last Modified: September 18, 2017

Reads one or more waveforms from a task that contains one or more analog input channels.

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task in

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

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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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number of samples per channel

number of samples per channel specifies the number of samples to read.

If you leave this input unwired or set it to -1, NI-DAQmx determines how many samples to read based on if the task acquires samples continuously or acquires a finite number of samples.

If the task acquires samples continuously and you set this input to -1, this node reads all the samples currently available in the buffer.

If the task acquires a finite number of samples and you set this input to -1, the node waits for the task to acquire all requested samples, then reads those samples. If you set the Read All Available Samples property to TRUE, the node reads the samples currently available in the buffer and does not wait for the task to acquire all requested samples.

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timeout

timeout specifies the amount of time in seconds to wait for samples to become available. If the time elapses, the node returns an error and any samples read before the timeout elapsed. The default timeout is 10 seconds. If you set timeout to -1, the node waits indefinitely.

If you set timeout to 0, the node tries once to read the requested samples and returns an error if it is unable to.

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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. This output provides standard error out functionality.

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data

data returns a 1D array of waveforms. Each element of the array corresponds to a channel in the task. The order of the channels in the array corresponds to the order in which you add the channels to the task or to the order of the channels you specify with the Channels to Read property. NI-DAQmx scales the data to the units of the measurement.

Where This Node Can Run:

Desktop OS: Windows

FPGA: LabVIEW NXG does not support FPGA devices

Web Server: Not supported in VIs that run in a web application


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