+5 V Power Source - National Instruments DAQ X Series User Manual

Signal Name Reference
APFI <0,1> AO GND
or AI GND
+5 V D GND
PFI <0..7>/P1.<0..7> D GND
PFI <8..15>/P2.<0..7>
NC —
*
Though AI GND, AO GND, and D GND are connected on the X Series device, they are connected by small traces to reduce
crosstalk between subsystems. Each ground has a slight difference in potential.

+5 V Power Source

The +5 V terminals on the I/O connector supply +5 V referenced to
D GND. Use these terminals to power external circuitry.
Caution Never connect the +5 V power terminals to analog or digital ground or to any
other voltage source on the X Series device or any other device. Doing so can damage the
device and the computer. NI is not liable for damage resulting from such a connection.
The power rating on most devices is +4.75 VDC to +5.25 VDC at 1 A.
Refer to the specifications document for your device to obtain the device
power rating.
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Table 3-1. I/O Connector Signals (Continued)
Direction
Input Analog Programmable Function Interface Channels
0 to 1—Each APFI signal can be used as AO external reference
inputs for AO <0..3>, 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.
Output +5 V Power Source—These terminals provide a fused +5 V
power source. Refer to the +5 V Power Source section for more
information.
Input or Programmable Function Interface or Digital I/O Channels 0
Output to 7 and Channels 8 to 15—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 or Port 2 digital I/O signal, you can individually
configure each signal as an input or output.
— No connect—Do not connect signals to these terminals.
3-3
Chapter 3 Connector and LED Information
Description
X Series User Manual