Chapter 1
DAQ System Overview
©
National Instruments Corporation
1-13
PFI 1/AI REF
TRIG, PFI 1
D GND
Input
PFI 1
—As an input, this pin is a PFI.
Output
AI Reference Trigger Signal
—As an output, this pin is
the ai/ReferenceTrigger signal. In applications with
pre-trigger samples, a low-to-high transition indicates the
initiation of the post-trigger samples. AI Reference Trigger
is not used in applications with post-trigger samples.
PFI 2/AI CONV
CLK
D GND
Input
PFI 2
—As an input, this pin is a PFI.
Output
AI Convert Clock Signal
—As an output, this pin is the
ai/ConvertClock signal. A high-to-low edge on AI CONV
indicates that an A/D conversion is occurring.
PFI 3/CTR 1 SRC
D GND
Input
PFI 3
—As an input, this pin is a PFI.
Output
Counter 1 Source Signal
—As an output, this pin is the
Ctr1Source signal. This signal reflects the actual source
connected to the general-purpose Counter 1.
PFI 4/CTR 1
GATE
D GND
Input
PFI 4
—As an input, this pin is a PFI.
Output
Counter 1 Gate Signal
—As an output, this pin is the
Ctr1Gate signal. This signal reflects the actual gate signal
connected to the general-purpose Counter 1.
CTR 1 OUT
D GND
Input
CTR 1 OUT
—As an input, this pin can be used to route
signals directly to the RTSI bus.
Output
Counter 1 Output Signal
—As an output, this pin emits
the Ctr1InternalOutput signal.
PFI 5/AO SAMP
CLK
D GND
Input
PFI 5
—As an input, this pin is a PFI.
Output
AO Sample Clock Signal
—As an output, this pin is the
ao/SampleClock signal. A high-to-low edge on AO SAMP
indicates that the AO primary group is being updated.
PFI 6/AO START
TRIG
D GND
Input
PFI 6
—As an input, this pin is a PFI.
Output
AO Start Trigger Signal
—As an output, this pin is the
ao/StartTrigger signal. In timed AO sequences, a
low-to-high transition indicates the initiation of the
waveform generation.
PFI 7/AI SAMP
CLK
D GND
Input
PFI 7
—As an input, this pin is a PFI.
Output
AI Sample Clock Signal
—As an output, this pin is the
ai/SampleClock signal. This pin pulses once at the start of
each AI sample in the interval sample. A low-to-high
transition indicates the start of the sample.
Table 1-4.
I/O Connector Signal Descriptions (Continued)
Signal Name
Reference
Direction
Description
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