National Instruments Data Acquisition Device NI USB-621x - Manual (Page 30)

Chapter 3 Connector and LED Information
© National Instruments Corporation 3-2 NI USB-621x User Manual
AO <0..1> AO GND Output Analog Output Channels 0 to 1—These terminals supply the
voltage output of AO channels 0 to 1.
AO GND — — Analog Output Ground—AO GND is the reference for
AO <0..1>. All three ground references—AI GND, AO GND,
and D GND—are connected on the device.
D GND — — Digital Ground—D GND supplies the reference for
PFI <0..15>/P0/P1 and +5 V. All three ground
references—AI GND, AO GND, and D GND—are connected
on the device.
+5 V D GND Input or
Output +5 V Power—These terminals provide a +5 V power source or
can be used to externally power the digital outputs.
PFI <0..3>,
PFI <8..11>/P0.<0..7> D GND Input (USB-6210/6211/6215/6218 Devices) Programmable
Function Interface or Static Digital Input
Channels 0 to 7—Each PFI terminal can be used to supply an
external source for AI, AO, or counter/timer inputs.
You also can use these terminals as static digital input lines.
PFI <4..7>,
PFI <12..15>/P1.<0..7> D GND Output (USB-6210/6211/6215/6218 Devices) Programmable
Function Interface or Static Digital Output
Channels 0 to 7—You can route many different internal AI,
AO, or counter/timer outputs to each PFI terminal.
You also can use these terminals as static digital output lines.
P0.<0..15> D GND Input or
Output (USB-6212/6216 Devices) Port 0 Digital I/O
Channels 0 to 15—You can individually configure each signal
as an input or output.
PFI <0..7>/P1.<0..7>,
PFI <8..15>/P2.<0..7> D GND Input or
Output (USB-6212/6216 Devices) Programmable Function Interface
or Digital I/O Channels 0 to 15—Each of these terminals can
be individually configured as a PFI terminal or a digital I/O
terminal.
As a PFI input, each terminal can be used to supply an external
source for AI, AO, DI, and DO timing signals or counter/timer
inputs.
As a PFI output, you can route many different internal AI, AO,
DI, or DO timing signals to each PFI terminal. You also can
route the counter/timer outputs to each PFI terminal.
As a Port 1 or Port 2 digital I/O signal, you can individually
configure each signal as an input or output.
NC — — No connect—Do not connect signals to these terminals.
Table 3-1. I/O Connector Signals (Continued)
Signal Name Reference Direction Description