Chapter 5 Using the SCXI-1125
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National Instruments Corporation
5-11
Using a DAQmx Channel Property Node in LabVIEW
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.
Note
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)
Flowchart Step
VI or Program Step
