NI USB-6008/6009 User Guide and Specifications 10 ni.com
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> Var ie s 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 Analog Input
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 Analog Output 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 Digital I/O 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 Digital I/O section for more
information.
PFI 0 GND Input PFI 0—This pin is configurable as either a digital trigger or an event
counter input. Refer to the PFI 0 section for more information.
+2.5 V GND Output +2.5 V External Reference—Provides a reference for wrap-back
testing. Refer to the +2.5 V External Reference section for more
information.
+5 V GND Output +5 V Power Source—Provides +5 V power up to 200 mA. Refer to the
+5 V Power Source section for more information.
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