National Instruments 6008 用户手册

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Table 5 describes the signals available on the I/O connectors.

Table 5.  Signal Descriptions

GND

—

—

Ground—The reference point for the 
single-ended AI measurements, bias 
current return point for differential mode 
measurements, AO voltages, digital 
signals at the I/O connector, 

+5 VDC 

supply, and the 

+2.5 VDC reference.

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, AI 5>, <AI 2, AI 6>, and 
<AI 3, AI 7>.

AO 0

GND

Output

Analog Channel 0 Output—Supplies the 
voltage output of AO channel 0. 

AO 1

GND

Output

Analog Channel 1 Output—Supplies the 
voltage output of AO channel 1.

P1.<0..3>
P0.<0..7>

GND

Input or
Output

Digital I/O Signals—You can 
individually configure each signal as an 
input or output. 

+2.5 V

GND

Output

+2.5 V External Reference—Provides a 
reference for wrap-back testing.

+5 V

GND

Output

+5 V Power Source—Provides +5 V 
power up to 200 mA.

PFI 0

GND

Input 

PFI 0—This pin is configurable as either a 
digital trigger or an event counter input.