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NI myDAQ User Guide
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© National Instruments
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9
Connecting Signals
Figure 4 shows the available audio, AI, AO, DIO, GND, and power signals accessed through the
3.5 mm audio jacks and screw terminal connections. Refer to Table 1 for descriptions of these
signals.
Cautions
Signal wires
must
be securely affixed and screwed down in the screw
terminal connector to ensure proper connection.
To ensure the specified EMC performance:
•
The length of any wire or cable connected to the 20-pin screw terminal
connector must be no longer than 0.3 m (1 ft).
•
The length of any wire or cable connected to the Audio or DMM ports must be
no longer than 3 m (10 ft).
Figure 4.
NI myDAQ 20-Position Screw Terminal I/O Connector
Table 1.
Screw Terminal Signal Descriptions
Signal
Name
Reference
Direction
Description
AUDIO IN
—
Input
Audio Input
—Left and right audio inputs
on a stereo connector
AUDIO OUT
—
Output
Audio Output
—Left and right audio
outputs on a stereo connector
+15V/-15V
AGND
Output
+15 V/-15 V power supplies
AGND
—
—
Analog Ground
—Reference terminal for
AI, AO, +15 V, and -15 V
AO 0/AO 1
AGND
Output
Analog Output Channels 0 and 1
AI 0+/AI 0-;
AI 1+/AI 1-
AGND
Input
Analog Input Channels 0 and 1
DIO <0..7>
DGND
Input or
Output
Digital I/O Signals
—General-purpose
digital lines or counter signals
DGND
—
—
Digital Ground
—Reference for the DIO
lines and the +5 V supply
5V
DGND
Output
5 V power supply
AUDIO
IN
AUDIO
OUT