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3-3
D GND
—
—
Digital Ground
—D GND supplies the reference
for P0.<0..31>, PFI <0..15>/P1/P2, and +5 V. All
three ground references—AI GND, AO GND,
and D GND—are connected on the device. Refer
to the
Connecting Digital I/O Signals
section of
Chapter 6,
P0.<0..31>
D GND
Input or
Output
Port 0 Digital I/O Channels
—You can
individually configure each signal as an input or
output. Refer to the
section of Chapter 6,
.
APFI <0,1>
AO GND
or AI GND
Input
Analog Programmable Function Interface
Channels
—Each APFI signal can be used as
AO external reference inputs for AO <0..3>,
AO external offset input, or as an analog trigger
input. APFI <0,1> are referenced to AI GND
when they are used as analog trigger inputs.
APFI <0,1> are referenced to AO GND when they
are used as AO external offset or reference inputs.
These functions are not available on all devices;
refer to the specifications for your device. Refer to
the
+5 V
D GND
Output
+5 V Power Source
—These terminals provide a
fused +5 V power source. Refer to the
section for more information.
PFI <0..7>/
P1.<0..7>
D GND
Input or
Output
Programmable Function Interface or Port 1
Digital I/O Channels
—Each of these terminals
can be individually configured as a PFI terminal or
a digital I/O terminal.
As an input, each PFI 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 digital I/O signal, you can individually
configure each signal as an input or output.
Refer to the
Connecting Digital I/O Signals
section of Chapter 6,
Table 3-1.
I/O Connector Signals (Continued)
Signal Name
Reference
Direction
Description
Summary of Contents for PCI-6281
Page 1: ...PCI 6281...
