Table Of Contents

DAQmx Read (G Dataflow)

Last Modified: May 7, 2018

Reads samples from the task or virtual channels you specify.

Analog

Floating Point

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Reads a single floating-point sample from a task that contains a single analog input channel.
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Reads one or more floating-point samples from a task that contains a single analog input channel.
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Reads a single floating-point sample from each channel in a task that contains one or more analog input channels.
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Reads one or more floating-point samples from a task that contains one or more analog input channels.

Waveform

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Reads a waveform that contains a single sample from a task that contains a single analog input channel.
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Reads a waveform from a task that contains a single analog input channel.
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Reads a waveform from a task that contains a single analog input channel.
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Reads a waveform that contains a single sample from each channel in a task that contains one or more analog input channels.
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Reads one or more waveforms from a task that contains one or more analog input channels.
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Reads one or more waveforms from a task that contains one or more analog input channels.

Unscaled

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Reads one or more unscaled 16-bit signed integer samples from a task that contains one or more analog input channels.
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Reads one or more unscaled 32-bit signed integer samples from a task that contains one or more analog input channels.
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Reads one or more unscaled 16-bit unsigned integer samples from a task that contains one or more analog input channels.
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Reads one or more unscaled 32-bit unsigned integer samples from a task that contains one or more analog input channels.

Raw

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Reads one or more raw, 8-bit signed integer samples from a task. Use this instance with devices that use 8-bit signed integers as the internal representation of a sample.
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Reads one or more raw, 16-bit signed integer samples from a task. Use this instance with devices that use 16-bit signed integers as the internal representation of a sample.
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Reads one or more raw, 32-bit signed integer samples from a task. Use this instance with devices that use 32-bit signed integers as the internal representation of a sample.
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Reads one or more raw, 8-bit unsigned integer samples from a task. Use this instance with devices that use 8-bit unsigned integers as the internal representation of a sample.
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Reads one or more raw, 16-bit unsigned integer samples from a task. Use this instance with devices that use 16-bit unsigned integers as the internal representation of a sample.
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Reads one or more raw, 32-bit unsigned integer samples from a task. Use this instance with devices that use 32-bit unsigned integers as the internal representation of a sample.

Digital

Line (Boolean)

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Reads a single Boolean sample from a task that contains a digital input channel composed of a single line.
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Reads a single Boolean sample from each channel in a task that contains one or more digital input channels. Each channel must contain only a single digital line.

Lines (Boolean Array)

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Reads an array of Boolean values from a task that contains a single digital input channel.
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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.

Port (Unsigned Integer)

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Reads a single 8-bit unsigned integer sample from a task that contains a single digital input channel. Use an instance that reads 8-bit unsigned integers for devices with up to eight lines per port.
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Reads one or more 8-bit unsigned integer samples from a task that contains a single digital input channel. Use an instance that reads 8-bit unsigned integers for devices with up to eight lines per port.
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Reads a single 8-bit unsigned integer sample from each channel in a task that contains one or more digital input channels. Use an instance that reads 8-bit unsigned integers for devices with up to eight lines per port.
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Reads one or more 8-bit unsigned integer samples from a task that contains one or more digital input channels. Use an instance that reads 8-bit unsigned integers for devices with up to eight lines per port.
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Reads a single 16-bit unsigned integer sample from a task that contains a single digital input channel. Use an instance that reads 16-bit unsigned integers for devices with up to 16 lines per port.
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Reads one or more 16-bit unsigned integer samples from a task that contains a single digital input channel. Use an instance that reads 16-bit unsigned integers for devices with up to 16 lines per port.
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Reads a single 16-bit unsigned integer sample from each channel in a task that contains one or more digital input channels. Use an instance that reads 16-bit unsigned integers for devices with up to 16 lines per port.
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Reads one or more 16-bit unsigned integer samples from a task that contains one or more digital input channels. Use an instance that reads 16-bit unsigned integers for devices with up to 16 lines per port.
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Reads a single 32-bit unsigned integer sample from a task that contains a single digital input channel. Use an instance that reads 32-bit unsigned integers for devices with up to 32 lines per port.
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Reads one or more 32-bit unsigned integer samples from a task that contains a single digital input channel. Use an instance that reads 32-bit unsigned integers for devices with up to 32 lines per port.
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Reads a single 32-bit unsigned integer sample from each channel in a task that contains one or more digital input channels. Use an instance that reads 32-bit unsigned integers for devices with up to 32 lines per port.
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Reads one or more 32-bit unsigned integer samples from a task that contains one or more digital input channels. Use an instance that reads 32-bit unsigned integers for devices with up to 32 lines per port.

Waveform

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Reads a digital waveform that contains a single sample from a task that contains a single digital input channel.
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Reads a digital waveform from a task that contains a single digital input channel.
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Reads a digital waveform from a task that contains a single digital input channel.
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Reads a waveform that contains a single sample from each channel in a task that contains one or more digital input channels.
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Reads one or more digital waveforms from a task that contains one or more digital input channels.
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Reads one or more digital waveforms from a task that contains one or more digital input channels.

Raw

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Reads one or more raw, 8-bit signed integer samples from a task. Use this instance with devices that use 8-bit signed integers as the internal representation of a sample.
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Reads one or more raw, 16-bit signed integer samples from a task. Use this instance with devices that use 16-bit signed integers as the internal representation of a sample.
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Reads one or more raw, 32-bit signed integer samples from a task. Use this instance with devices that use 32-bit signed integers as the internal representation of a sample.
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Reads one or more raw, 8-bit unsigned integer samples from a task. Use this instance with devices that use 8-bit unsigned integers as the internal representation of a sample.
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Reads one or more raw, 16-bit unsigned integer samples from a task. Use this instance with devices that use 16-bit unsigned integers as the internal representation of a sample.
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Reads one or more raw, 32-bit unsigned integer samples from a task. Use this instance with devices that use 32-bit unsigned integers as the internal representation of a sample.

Counter

Floating Point

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Reads the pulse frequency from a counter input task.
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Reads one or more floating-point samples from a counter task. Use an instance that reads a floating-point value when NI-DAQmx scales counter samples to a floating-point value, such as for frequency and period measurement.
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Reads one floating-point sample from one or more counter tasks. Use an instance that reads a floating-point value when NI-DAQmx scales counter samples to a floating-point value.
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Reads one or more floating-point samples from one or more counter tasks. Use an instance that reads a floating-point value when NI-DAQmx scales counter samples to a floating-point value.

Unsigned Integer

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Reads a 32-bit unsigned integer sample from a counter task. Use an instance that reads 32-bit unsigned integers when NI-DAQmx returns counter samples unscaled, such as for event counting.
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Reads one or more 32-bit unsigned integer samples from a counter task. Use an instance that reads 32-bit unsigned integers when NI-DAQmx returns counter samples unscaled, such as for event counting.
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Reads an unscaled 32-bit unsigned integer sample from one or more counter tasks.
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Reads one or more unscaled 32-bit unsigned integer samples from one or more counter tasks.

Pulse Frequency and Duty Cycle

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Reads the pulse frequency and duty cycle from a counter input task.
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Reads one or more pairs of pulse frequency and duty cycle from a counter input task.

Pulse High Time and Low Time

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Reads a single pair of pulse high and low times from a counter input task.
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Reads one or more pairs of pulse high and low times from a counter input task.

Pulse High Ticks and Low Ticks

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Reads a single pair of pulse high and low tick counts from a counter input task.
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Reads one or more pairs of pulse high and low tick counts from a counter input task.

Raw

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Reads one or more raw, 8-bit signed integer samples from a task. Use this instance with devices that use 8-bit signed integers as the internal representation of a sample.
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Reads one or more raw, 16-bit signed integer samples from a task. Use this instance with devices that use 16-bit signed integers as the internal representation of a sample.
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Reads one or more raw, 32-bit signed integer samples from a task. Use this instance with devices that use 32-bit signed integers as the internal representation of a sample.
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Reads one or more raw, 8-bit unsigned integer samples from a task. Use this instance with devices that use 8-bit unsigned integers as the internal representation of a sample.
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Reads one or more raw, 16-bit unsigned integer samples from a task. Use this instance with devices that use 16-bit unsigned integers as the internal representation of a sample.
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Reads one or more raw, 32-bit unsigned integer samples from a task. Use this instance with devices that use 32-bit unsigned integers as the internal representation of a sample.

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