About the Session-Based Interface :: Using the Session-Based Interface (Data Acquisition Toolbox™)

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Contents

Index

• Getting Started

• User's Guide

• Data Acquisition Workflow

• Getting Started with Analog Input

• Doing More with Analog Input

• Analog Output

• Advanced Configurations Using Analog Input and Analog Output

• Using the Session-Based Interface

• About the Session-Based Interface

Working with Sessions

Session-Based Interface and Data Acquisition Toolbox

• Working with the Session-Based Interface

Session Architecture

Counter Channels

Bridge Channels

Create a Session

• Acquire Analog Input Data

Using addAnalogInputChannel

Acquire Data in the Foreground

Acquire Data from Multiple Channels

Acquire Data in the Background

Acquire Data from an Accelerometer Using NI and CompactDAQ Devices

Acquire Bridge Measurements

Acquire Sound Pressure Data

Acquire IEPE Data

• Acquire Counter Input Data

addCounterInputChannel

Acquire a Single EdgeCount

Acquire a Single Frequency Count

Acquire Counter Input Data in the Foreground

• Generating Analog Output Signals

Using addAnalogOutputChannel

Generating Signals in the Foreground

Generating Signals Using Multiple Channels

Generating Signals in the Background

Generating Signals in the Background Continuously

• Generating Data on a Counter Channel

Using addCounterOutputChannel

Generating Pulses on a Counter Output Channel

Acquire Data and Generate Signals Simultaneously

• Trigger Connections

When to Use Triggers

External Triggering

Acquire Voltage Data Using a Digital Trigger

• Clock Connections

When to Use Clocks

Import a Scan Clock from an External Source

Export a Scan Clock to an External System

• Synchronization

Synchronization Scenarios

Source and Destination Devices

Automatic Synchronization

Multiple-Device Synchronization

Multiple-Chassis Synchronization

• Digital Input/Output

Creating a Digital I/O Object

The Parallel Port

Using the Addline Function

Line and Port Characteristics

Referencing Individual Hardware Lines

Writing Digital Values

Reading Digital Values

Example: Writing and Reading Digital Values

Starting and Stopping a Digital I/O Object

Example: Generating Timer Events

Running Property

The Display Summary

• Saving and Loading

Saving Device Objects to a File

Saving Device Objects to a MAT-File

Analog Input Logging Properties

Specifying a Filename

Retrieving Logged Information

Example: Logging and Retrieving Information

• softscope: The Data Acquisition Oscilloscope

Opening the Oscilloscope

Hardware Configuration

Creating a Display

Creating Additional Displays

Configuring Display Properties

Math and Reference Channels

Removing Channel Displays

Scaling the Channel Data

Configuring Channel Properties

Acquisition Types

Configuring Trigger Properties

Predefined Measurement

Defining a Measurement

Defining a New Measurement Type

Configuring Measurement Properties

• Using the Data Acquisition Blocks in Simulink

Using the daqlib Command from the MATLAB Workspace

Using the Simulink Library Browser

Data Acquisition Toolbox Block Library

Example: Bringing Analog Data into a Model

• Troubleshooting Your Hardware

Registering the Hardware Driver Adaptor

Device Driver Registration

Session-Based Interface and Legacy Interface

Hardware Driver Version

Hardware Performance

Cannot Create Session

Session was Deleted

Cannot Find Vendor

Cannot Find Devices

Reserved Hardware

Unsupported Devices

Network Devices

ADC Overrun Error with External Clock

Cannot Add Clock Connection

Installed Adaptors

Advantech Hardware

Measurement Computing Hardware

Other Manufacturers

• Vendor Limitations

• Managing Your Memory Resources

• Base Property Reference

Common Properties

Channel Properties

Common Properties

Channel Properties

Common Properties

Line Properties

Getting Command-Line Property Help

• Device-Specific Property by Vendor Reference

Getting Command-Line Property Help

Device-Specific Properties - Alphabetical List

• Release Notes

About the Session-Based Interface

On this page…

Working with Sessions

Session-Based Interface and Data Acquisition Toolbox

Working with Sessions

Use the daq.Session object to communicate National Instruments devices, including a CompactDAQ chassis. The general workflow for session operations is as follows:

Use the daq.createSession method to create a data acquisitions session. See Session Architecture for more information.

You can also synchronize operations within the session. See for more information.

Session-Based Interface and Data Acquisition Toolbox

Data Acquisition Toolbox and the MATLAB technical computing environment use the session-based interface to communicate with National Instruments devices, including a CompactDAQ chassis. You can operate in the foreground, where the operation blocks MATLAB until complete, or in the background, where MATLAB continues to run additional MATLAB commands in parallel with the hardware operation. See Session Architecture for more information.

You can create a session with both analog input and analog output channels and configure acquisition and generation simultaneously. See Acquiring Data and Generating Signals Simultaneously for more information.

Using the Session-Based Interface

Using the Session-Based Interface

Working with the Session-Based Interface

Working with the Session-Based Interface

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