National Instruments Data Acquisition Device NI USB-621x, User Manual

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Chapter 3 Connector and LED Information
© National Instruments Corporation 3-2 NI USB-621x User Manual
AO <0..1> AO GND O u tp u t Analog Output Channels 0 to 1 —These terminals s u pply the
voltage o u tp u t of AO channels 0 to 1.
AO GND — — Analog Output Ground —AO GND is the reference for
AO <0..1>. All three gro u nd references—AI GND, AO GND,
and D GND—are connected on the device.
D GND — — Digital Ground —D GND s u pplies the reference for
PFI <0..15>/P0/P1 and +5 V. All three gro u nd
references—AI GND, AO GND, and D GND—are connected
on the device.
+5 V D GND Inp u t or
O u tp u t
+5 V Power —These terminals provide a +5 V power so u rce or
can be u sed to externally power the digital o u tp u ts.
PFI <0..3>,
PFI <8..11>/P0.<0..7> D GND Inp u t (USB-6210/6211/6215/6218 Devices) Programmable
Function Interface or Static Digital Input
Channels 0 to 7
—Each PFI terminal can be u sed to s u pply an
external so u rce for AI, AO, or co u nter/timer inp u ts.
Yo u also can u se these terminals as static digital inp u t lines.
PFI <4..7>,
PFI <12..15>/P1.<0..7> D GND O u tp u t
(USB-6210/6211/6215/6218 Devices)
Programmable
Function Interface or Static Digital Output
Channels 0 to 7
—Yo u can ro u te many different internal AI,
AO, or co u nter/timer o u tp u ts to each PFI terminal.
Yo u also can u se these terminals as static digital o u tp u t lines.
P0.<0..15> D GND Inp u t or
O u tp u t
(USB-6212/6216 Devices) Port 0 Digital I/O
Channels 0 to 15 —Yo u can individ u ally config u re each signal
as an inp u t or o u tp u t.
PFI <0..7>/P1.<0..7>,
PFI <8..15>/P2.<0..7> D GND Inp u t or
O u tp u t
(USB-6212/6216 Devices)
Programmable Function Interface
or Digital I/O Channels 0 to 15 —Each of these terminals can
be individ u ally config u red as a PFI terminal or a digital I/O
terminal.
As a PFI inp u t, each terminal can be u sed to s u pply an external
so u rce for AI, AO, DI, and DO timing signals or co u nter/timer
inp u ts.
As a PFI o u tp u t, yo u can ro u te many different internal AI, AO,
DI, or DO timing signals to each PFI terminal. Yo u also can
ro u te the co u nter/timer o u tp u ts to each PFI terminal.
As a Port 1 or Port 2 digital I/O signal, yo u can individ u ally
config u re each signal as an inp u t or o u tp u t.
NC — — No connect —Do not connect signals to these terminals.
Table 3-1. I/O Connector Signals (Continued)
Signal Name Reference Direction Description