NI DAQ Signal Names Meanings, Definitions and Descriptions

Solution

The I/O connector signal descriptions can be found in the help file for the specific series of card.

I/O Connector Signal Description Locations:

E Series User Manual >> Chapter 1 : DAQ System Overview >> Table 1-4. I/O Connector Signal Description
M Series User Manual >> Chapter 3 : Connector and LED Information >> Table 3-1. I/O Connector Signals
S Series User Manual >> Chapter 3 : I/O Connector >> Table 3-1. S Series Device Signal Descriptions
X Series User Manual >> Chapter 3 : Connector and LED Information >> Table 3-1. I/O Connector Signals
Analog Output Series User Manual >> Chapter 2 : I./O Connector >> Table 2-2. I/O Connector Signal Descriptions

Common Signal Name Definitions: Please refer to following table.

SIGNAL	Description
AI_SENSE	In NRSE mode, the reference for each Analog Input signal is AI SENSE.
PFI	Programmable Function Interface - 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.
AO_SAMP_CLK	As an output, this pin emits the ao/SampleClock signal. A high-to-low transition of this signal indicates a new sample is being generated.
FREQ_OUT	Frequency Output Signal—This output is from the frequency generator.
EXT_STROBE	This pin is used to control some NI accessories. EXT STROBE is an output-only signal that generates either a single pulse or a sequence of eight pulses in the hardware-strobe mode. An external device can use this signal to latch signals or to trigger events.