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DAQmx Read (Multiple Channels) (G Dataflow)

Last Modified: September 18, 2017

Reads a single sample that contains Boolean values from each channel in a task that contains one or more digital input channels. Each channel can contain multiple digital lines.


task in

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



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.


error in

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


task out

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



data returns a 2D array of Boolean samples. Each row corresponds to a channel in the task. Each column corresponds to a line in that channel. The order of the channels in the array corresponds to the order that you add the channels to the task or to the order of the channels you specify in the Channels to Read property. The order of the lines in each channel corresponds to the order that you add the lines to the channel.


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

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

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