NI USB-6008/6009 User Guide and Specifications
10
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Table 5.
Signal Descriptions
Signal Name
Reference
Direction
Description
GND
—
—
Ground
—The reference point for the single-ended analog input
measurements, analog output voltages, digital signals, +5 VDC supply,
and +2.5 VDC at the I/O connector, and the bias current return point for
differential mode measurements.
AI <0..7>
Varies
Input
Analog Input Channels 0 to 7
—For single-ended measurements, each
signal is an analog input voltage channel. For differential measurements,
AI 0 and AI 4 are the positive and negative inputs of differential analog
input channel 0. The following signal pairs also form differential input
channels: AI<1, 5>, AI<2, 6>, and AI<3, 7>. Refer to the
section for more information.
AO <0, 1>
GND
Output
Analog Output Channels 0 and 1
—Supplies the voltage output of
AO channel 0 or AO channel 1. Refer to the
section for
more information.
P0.<0..7>
GND
Input or Output
Port 0 Digital I/O Channels 0 to 7
—You can individually configure
each signal as an input or output. Refer to the
section for
more information.
P1.<0..3>
GND
Input or Output
Port 1 Digital I/O Channels 0 to 3
—You can individually configure
each signal as an input or output. Refer to the
section for more
information.
PFI 0
GND
Input
PFI 0
—This pin is configurable as either a digital trigger or an event
section for more information.
+2.5 V
GND
Output
+2.5 V External Reference
—Provides a reference for wrap-back
testing. Refer to the
section for more
information.
+5 V
GND
Output
+5 V Power Source
—Pr5 V power up to 200 mA. Refer to the
section for more information.
