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NI myDAQ User Guide
Using NI-DAQmx with NI myDAQ
NI myDAQ is supported by NI-DAQmx, and therefore you can program it using the DAQ
Assistant Express VI. Figure 20 shows the DAQ Assistant Express VI.
Figure 20.
DAQ Assistant Express VI
Note
In NI-DAQmx, DIO <0..7> appear as P0.<0..7>.
Furthermore, you can use NI-DAQmx to program some of the available general AI, AO, and
timing functionality of the device. Refer to the
NI ELVISmx Help
and
NI-DAQmx Help
for more
information.
Note
When using NI-DAQmx to read the audio channels, you must manually
change the voltage range to ±2 V from the default voltage range of ±10 V. The ±10 V
range is not supported by NI-DAQmx and will cause an NI-DAQmx error, but it will
not cause the user to receive corrupt data.
Example: Measuring Audio Pass-Through in LabVIEW
with NI myDAQ
This example covers the simultaneous acquisition of input signals and generation of output
signals using the DAQ Assistant in LabVIEW. This example forms the foundation for audio
signal processing experimentation.
1.
Launch LabVIEW.
2.
In the
Getting Started
window, click
Blank VI
. A blank VI opens. Select
Window»Show
Block Diagram
to open the VI block diagram.
3.
Locate the DAQ Assistant Express VI by right-clicking the block diagram window and
selecting
Measurement I/O»NI DAQmx»DAQ Assist
from the
Functions
palette.
4.
Place the DAQ Assistant Express VI on the block diagram. The DAQ Assistant
Create
New Express Task
configuration window opens.
Tip
You can also use the Quick Drop dialog box to locate the DAQ Assistant
Express VI. Select
View»Quick Drop
or press the <Ctrl-Space> keys to display this
dialog box.
5.
In the DAQ Assistant configuration window, select
Acquire Signals»Analog Input
, and
click
Voltage
to select a Voltage task.
6.
In the
Supported Physical Channels
window, select
audioInputLeft
from under the Dev
x
(NI myDAQ) option. You can also press <Ctrl> while clicking
audioInputRight
to select
both channels.