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National Instruments NI PXI-4224 Using a DAQmx Channel Property Node in LabVIEW

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Chapter 5 Using the NI PXI-4224

© National Instruments Corporation 5-7 NI PXI-4224 User Manual

Using a DAQmx Channel Property Node in LabVIEW

You can use property nodes in LabVIEW to manually configure your

channels. To create a LabVIEW property node, complete the following

steps:

1. Launch LabVIEW.

2. You can create the property node in a new VI or in an existing VI.

3. Open the block diagram view.

4. From the Functions toolbox, select All Functions»

NI Measurements»DAQmx - Data Acquisition, and select

DAQmx Channel Property Node.

5. Left-click inside the Property box and select Active Channels. This

allows you to specify exactly what channel(s) you want to configure.

If you want to configure several channels with different properties,

separate the lists of properties with another Active Channels box, and

assign the appropriate channel to each list of properties.

Note If you do not use Active Channels, the properties will be set on all of the channels

in the task.

6. Right-click ActiveChan and select Add Element. Left-click the new

ActiveChan. Navigate through the menus and select the property you

wish to define.

7. You must change the property to read or write to either get the property

or write a new value. Right-click the property, go to Change To, and

select Write, Read, or Default Value.

Continue Sampling For continuous sampling, use a While Loop. If you are using

hardware timing, you also need to set the DAQmx Timing.vi

sample mode to Continuous Samples. To set the VI, right-click

the terminal of the DAQmx Timing.vi labeled sample mode

and click Create»Constant. Click the box and select

Continuous Samples.

Stop Measurement DAQmx Stop Task.vi—This VI is optional. Clearing the task

will automatically stop the task.

Clear Task DAQmx Clear Task.vi

Table 5-2. Programming a Task in LabVIEW (Continued)

Flowchart Step VI or Program Step

Contents

Main Page Important Information Warranty Copyright Trademarks Patents Conventions Contents Page Figures Tables About the NI PXI-4224 What You Need to Get Started National Instruments Documentation Installing the Application Software, NI-DAQ, and the DAQ Device Installing the NI PXI-4224 LED Pattern Descriptions Connecting Signals Connecting Signals to the NI PXI-4224 Front Signal Connector Page Analog Input Connections Page Figure 2-3. Unshielded Grounded Signal Source Connection Using a D-SUB Connector Figure 2-4. Shielded Floating Signal Source Connection Using a D-SUB Connector Figure 2-5. Shielded Grounded Signal Source Connection Using a D-SUB Connector Figures 2-6 through 2-9 illustrate connecting signals using a terminal block. Figure 2-6. Unshielded Floating Signal Source Connection Using a Terminal Block Figure 2-7. Unshielded Grounded Signal Source Connection Using a Terminal Block Figure 2-8. Shielded Floating Signal Source Connection Using a Terminal Block Floating Signal Source Connection Ground-Referenced Signal Connection Shielded Ground-Referenced Signal Connection (Recommended) Configuring and Testing Verifying and Self-Testing the Signals Using Test Panels Configuring the NI PXI-4224 in MAX Creating a Voltage Task or Global Channel Using NI-DAQmx Verifying and Self-Testing an NI-DAQmx Task or Global Channel Page Chapter 4 Theory of Operation Figure 4-1. Block Diagram of NI PXI-4224 NI PXI-4224 User Manual 4-2 ni.com Signal Conditioning Functional Overview Measurement Considerations Input Impedance Common-Mode Rejection Ratio Effective CMR Timing and Control Functional Overview Programmable Function Inputs Device and PXI Clocks Figure 4-4 shows this signal connection scheme. Figure 4-4. NI PXI-4224 PXI Trigger Bus Signal Connection Page Using the NI PXI-4224 Developing Your Application Typical Program Flow Chart Figure 5-1. Typical Program Flowchart Overview of Typical Flow Chart Creating a Task Using DAQ Assistant or Programmatically Adjusting Timing and Triggering Configuring Channel Properties Acquiring, Analyzing, and Presenting Completing the Application Developing an Application Using LabVIEW Page Using a DAQmx Channel Property Node in LabVIEW Synchronization and Triggering Synchronizing the NI PXI-4224 Figure 5-2. General Synchronizing Flowchart Synchronizing the NI PXI-4224 Using LabVIEW Other Application Documentation and Material Calibrating the NI PXI-4224 Loading Calibration Constants Self-Calibration External Calibration A Specifications Overvoltage Protection Analog Input Accuracy Transfer Characteristics Calibration Pre-Calibration Errors Memory Digital Triggers PXI Trigger Bus PCI Bus Interface Power Requirements Physical Maximum Working Voltage Isolation Voltages Environmental Safety Electromagnetic Compatibility CE Compliance Online Product Certification Environmental Management RoHS B Timing Signal Information Connecting Timing Signals Programmable Function Input Connections DAQ Timing Connections AI START TRIG Signal AI REF TRIG Signal AI SAMP CLK Signal Page AI CONV CLK Signal AI PAUSE TRIG Signal AI SAMPLE CLK TIMEBASE Signal AI HOLD COMPLETE Signal C Removing the NI PXI-4224 Removing the NI PXI-4224 from a PXI or PXI/SCXI Combination Chassis Removing the NI PXI-4224 from MAX D Common Questions Page Glossary Symbols A B C D E F G H I K L M N O P R S T V Page Index A B C D E F G H I L O P Q R S T V