National Instruments SCXI -1125 用户手册

© National Instruments Corporation

You can use property nodes in LabVIEW to manually configure the 
channels. To create a LabVIEW property node, complete the following 
steps:

1.

Launch LabVIEW.

2.

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 Measurement I/O»

 

DAQmx - Data Acquisition, and select DAQmx Channel Property 
Node.

5.

Use the ActiveChans box 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 ActiveChans 
box and assign the appropriate channel to each list of properties.

If you do not use Active Channels, the properties are set on all of the channels in 

the task.

6.

Right-click ActiveChans, and select Add Element. Left-click the new 
ActiveChans box. Navigate through the menus, and select the 
property you wish to define.

Display Data

You can use graphical tools such as charts, gauges, and graphs 
to display your data. Some display tools are located on the 
Controls»All Controls»Numeric»Numeric Indicators 
subpalette and Controls»All Controls»Graph subpalette.

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 do this, right-click the 
terminal of the 

DAQmx Timing.vi

 labeled sample mode and 

click Create»Constant. Click the box that appears and select 
Continuous Samples.

Stop Measurement

DAQmx Stop Task.vi

 (This VI is optional, clearing the task 

automatically stops the task.)

Clear Task

DAQmx Clear Task.vi

Table 5-4.  Programming a Task in LabVIEW (Continued)