I/O Connector Signal Descriptions

AI <0..7> GND

—

—

Analog Input Channels 0 through 7 ground—These pins are the bias current return point for differential measurements.

AI <0..7> +

AI <0..7> GND

Input

Analog Input Channels 0 through 7 (+)—These pins are routed to the (+) terminal of the respective channel amplifier.

AI <0..7> -

AI <0..7> GND

Input

Analog Input Channels 0 through 7 (–)—These pins are routed to the (–) terminal of the respective channel amplifier.

AO 0

AO GND

Output

Analog Output Channel 0—This pin supplies the voltage output of Analog Output channel 0.

AO 1

AO GND

Output

Analog Output Channel 1—This pin supplies the voltage output of Analog Output channel 1.

AO GND

—

—

Analog Output Ground—The AO voltages and the external reference voltage are referenced to these pins.

D GND

—

—

Digital Ground—These pins supply the reference for the digital signals at the I/O connector and the +5 VDC supply.

P0.<0..7>

D GND

Input or Output

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.

+5 V

D GND

Output

+5 Power Source—These pins provide +5 V power.

EXT STROBE*

D GND

Output

External Strobe Signal—This output can be toggled under software control to latch signals or trigger events on external devices.

PFI 0/AI START TRIG

D GND

Input

PFI 0—As an input for digital signals, this pin is a general-purpose input terminal. As an input for analog signals, this pin is the source for the hardware analog trigger. This is the default input for the ai/StartTrigger signal. PFI signals are explained in Connecting Timing Signals.

Output

AI Start Trigger Signal—As an output, this pin emits the ai/StartTrigger signal. A low-to-high transition of this signal indicates the start of an acquisition.

PFI 1/AI REF TRIG

D GND

Input

PFI 1—As an input, this is a general-purpose input terminal. This is the default input for the ai/ReferenceTrigger signal.

Output

AI Reference Trigger Signal—As an output, this pin emits the ai/ReferenceTrigger signal. This is a low-to-high transition signal.

PFI 2

D GND

Input

PFI 2—As an input, this pin is a general-purpose input terminal.

PFI 3/CTR 1 SOURCE

D GND

Input

PFI 3—As an input, this pin is a general-purpose input terminal. This is the default input for the Ctr1Source signal.

Output

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.

PFI 4/CTR 1 GATE

D GND

Input

PFI 4—As an input, this pin is a general-purpose input terminal. This is the default input for the Ctr1Gate signal.

Output

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.

CTR 1 OUT

D GND

Output

Counter 1 Output Signal—This pin emits the Ctr1InternalOutput signal.

PFI 5/AO SAMP CLK*

D GND

Input

PFI 5—As an input, this pin is a general-purpose input terminal.

Output

AO Sample Clock Signal—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.

PFI 6/AO START TRIG

D GND

Input

PFI 6—As an input, this pin is a general-purpose input terminal. This is the default input for the ao/StartTrigger signal.

Output

AO Start Trigger Signal—As an output, this pin emits the ao/StartTrigger signal. A low-to-high transition of this signal indicates the start of a generation.

PFI 7/AI SAMP CLK

D GND

Input

PFI 7—As an input, this pin is a general-purpose input terminal.

Output

AI Sample Clock Signal—As an output, this pin emits the ai/SampleClock signal. A low-to-high transition of this signal indicates the start of the sample.

PFI 8/CTR 0 SOURCE

D GND

Input

PFI 8—As an input, this pin is a general-purpose input terminal and can also be used to route signals directly to the RTSI bus. This is the default input for the Ctr0Source signal.

Output

Counter 0 Source Signal—As an output, this pin emits the Ctr0Source signal. This signal reflects the actual source signal connected to Counter 0.

PFI 9/CTR 0 GATE

D GND

Input

PFI 9—As an input, this pin is a general-purpose input terminal and can also be used to route signals directly to the RTSI bus. This is the default input for the Ctr0Gate signal.

Output

Counter 0 Gate Signal—As an output, this pin emits the Ctr0Gate signal. This signal reflects the actual gate signal connected to Counter 0.

CTR 0 OUT

D GND

Input

Counter 0 Output Signal—As an input, this pin can be used to route signals directly to the RTSI bus.

Output

As an output, this pin emits the Ctr0InternalOutput signal.

FREQ OUT

D GND

Output

Frequency Output Signal—This output is from the frequency generator.