30 | ni.com | 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 Devx
(NI myDAQ) option. You can also press <Ctrl> while clicking audioInputRight to select
both channels.
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