National Instruments Data Acquisition Device E Series User Manual page 29

Chapter 1 DAQ System Overview
Signal Name
D GND
P0.<0..7> D GND
AO EXT REF AO GND
P1.<0..7> D GND
P2.<0..7> D GND
P3.<0..7> D GND
+5 V D GND
AI HOLD COMP D GND
EXT STROBE D GND
PFI 0/AI START D GND
TRIG
E Series User Manual
Table 1-4. I/O Connector Signal Descriptions (Continued)
Reference Direction
— —
Input or
Output
Input
Input or
Output
Input or
Output
Input or
Output
Output
Output
Output
Input
Output
Digital Ground—These pins supply the reference for the
digital signals at the I/O connector as well as the +5 VDC
supply. All three ground references—AI GND, AO GND,
and D GND—are connected on the device.
Digital I/O Signals—You can individually configure each
signal as an input or output. P0.6 and P0.7 can also control
the up/down signal of Counters 0 and 1, respectively.
External Reference—This is the external reference input
for the AO circuitry.
NI 6025E only—Port 1 bidirectional digital data lines for
the 82C55A programmable peripheral interface. P1.7 is the
most significant bit (MSB). P1.0 is the least significant bit
(LSB).
NI 6025E only—Port 2 bidirectional digital data lines for
the 82C55A programmable peripheral interface. P2.7 is the
MSB. P2.0 is the LSB.
NI 6025E only—Port 3 bidirectional digital data lines for
the 82C55A programmable peripheral interface. P3.7 is the
MSB. P3.0 is the LSB.
+5 V Power Source—These pins provide +5 V power.
AI Hold Complete Event Signal—When enabled, this
signal pulses once for each A/D conversion in sampling
mode. The low-to-high edge indicates when the input
signal can be removed from the input or switched to
another signal.
External Strobe Signal—You can toggle this output with
software controls to latch signals or trigger events on
external devices. This functionality is not available in
LabVIEW or NI-DAQ. EXT STROBE is used for
controlling SCXI chassis, and it is not a general-purpose
signal. If you want to use or control this signal, you must
perform register-level programming.
PFI 0—As an input, this pin is a programmable function
interface (PFI).
AI Start Trigger Signal—As an output, this pin is the
ai/StartTrigger signal. In post-trigger DAQ sequences, a
low-to-high transition indicates the initiation of the
acquisition sequence. In applications with pre-trigger
samples, a low-to-high transition indicates the initiation of
the pre-trigger samples.
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Description
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