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Chapter 2
I/O Connector
Table 2-2. I/O Connector Signal Descriptions (Continued)
I/O Connector
Pin
+5 V
AO EXT REF
AI HOLD COMP
EXT STROBE
PFI 0
PFI 1
PFI 2
PFI 3/CTR 1
SOURCE
PFI 4/CTR 1
GATE
2-8 | ni.com
Reference
Direction
D GND
Output
D GND
Input
D GND
Output
D GND
Output
D GND
Input
D GND
Input
D GND
Input
D GND
Input
Output
D GND
Input
Output
Signal Description
+5 VDC source—These pins provide
+5 V power.
External Reference—This pin is the
external reference input for the AO
circuitry.
AI Hold Complete—This pin is used to
control some NI accessories.
External Strobe—This pin is used to
control some NI accessories.
PFI 0—As an input for digital signals, this
pin is a general-purpose input terminal.
For an explanation of PFI signals, refer to
Connecting Timing Signals
the
PFI 1—As an input, this is a
general-purpose input terminal.
PFI 2—As an input, this pin is a
general-purpose input terminal.
PFI 3—As an input, this pin is a
general-purpose input terminal. This is the
default input for the Ctr1Source signal.
Counter 1 Source Signal—As an output,
this pin emits the selected Ctr1Source
signal. This signal reflects the actual
source signal connected to Counter 1. For
more information, refer to Chapter 5,
Counters.
PFI 4—As an input, this pin is a
general-purpose input terminal. This is the
default input for the Ctr1Gate signal.
Counter 1 Gate Signal—As an output,
this pin emits the selected Ctr1Gate signal.
This signal reflects the actual gate signal
connected to Counter 1. For more
information, refer to Chapter 5, Counters.
section.
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