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Chapter 1
DAQ System Overview
Traditional NI-DAQ (Legacy)
REQ#
SCANCLK
SISOURCE
STARTSCAN
STOPTRIG#
TRIG1
TRIG2
UISOURCE
UPDATE
WFTRIG
+5 V Power Source
Caution
Never connect these +5 V power pins to analog or digital ground or to any other
voltage source on the E 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.
E Series User Manual
Table 1-5. Terminal Name Equivalents (Continued)
The +5 V pins on the I/O connector supply +5 V power on the plug-in cards
or from an internal step-down voltage regulator on DAQPads. You can
use these pins, referenced to D GND, to power external circuitry. A
self-resetting fuse protects the supply from overcurrent conditions. The
fuse resets automatically within a few seconds after the overcurrent
condition is removed.
Power rating (most devices): +4.65 to +5.25 VDC at 1 A.
To find your device power rating, refer to the specifications document for
your device.
NI-DAQmx
PFI #
AI HOLD COMP or AI HOLD
AI Sample Clock Timebase
AI SAMP CLK or AI SAMP
PFI #
AI START TRIG or AI START
AI REF TRIG or REF TRIG
AO Sample Clock Timebase
AO SAMP CLK or AO SAMP
AO START TRIG or AO START
1-16
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