Digital Input and Output

Acquire and generate digital data with data acquisition hardware

To learn how to create a session and acquire or generate digital data, see Digital Input and Output Workflow.

Before you use digital channels, see Hardware Discovery and Session Setup.

Functions

`addDigitalChannel`	Add digital channel
`inputSingleScan`	Acquire single scan from all input channels
`outputSingleScan`	Generate single scan on all output channels
`queueOutputData`	Queue data to be output
`startForeground`	Start foreground operations
`startBackground`	Start background operations

`addClockConnection`	Add clock connection
`stop`	Stop background operation
`wait`	Block MATLAB until background operation completes

`decimalToBinaryVector`	Convert decimal value to binary vector
`binaryVectorToDecimal`	Convert binary vector value to decimal value
`hexToBinaryVector`	Convert hexadecimal value to binary vector
`binaryVectorToHex`	Convert binary vector value to hexadecimal

Events

`addlistener`	Create event listener
`DataAvailable`	Notify when acquired data is available to process
`DataRequired`	Notify when additional data is required for output on continuous generation
`ErrorOccurred`	Notify when device-related errors occur

Properties

`Device`	Channel device information
`Direction`	Specify digital channel direction
`ID`	ID of channel in session
`Name`	Specify descriptive name for the channel

Topics

Basic Workflow

Digital Subsystem Channels

Transfer digital or logical values in bits via digital lines.

Acquire Non-Clocked Digital Data

Acquire a single scan of digital data from two channels of an NI device.

Generate Non-Clocked Digital Data

This example shows how to write data to two lines on an NI 625

Acquire Digital Data Using an External Clock

Acquire digital data in the foreground using an external scan clock.

Acquire Digital Data in Hexadecimal Values

This example shows how to write data using two channels on an NI 6255.

Acquire Digital Data Using a Shared Clock

Share the clock with the analog input subsystem on your device with the digital subsystem.

Acquire Digital Data Using a Counter Output Channel as External Clock

Acquire digital data using a counter output channel to generate clock pulses.

Generate Signals Using Decimal Data Across Multiple Lines

This example shows how to convert decimal data and output to two lines on an NI 6255.

Control Stepper Motor using Digital Outputs

This example shows how to control a stepper motor using digital output ports.

Generate and Acquire Data on Bidirectional Channels

This example shows how to use a bidirectional channel and read and write data using the same two lines on an NI 6255.

Generate Signals on Both Analog and Digital Channels

This example shows how to generate signals when the session contains both analog and digital channels.

Featured Examples

Control Stepper Motor using Digital Outputs

Control a stepper motor using digital output ports.

Open Script

Communicate with I2C devices and analyze bus signals using digital IO

MATLAB® is able to communicate with instruments and devices at the protocol layer as well as the physical layer. This example uses the I2C feature of the Instrument Control Toolbox to communicate with a TMP102 temperature sensor, and simultaneously analyze the physical layer I2C bus communications using the clocked digital IO feature of the Data Acquisition Toolbox.

Open Script