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Chapter 4 Connecting Signals
© National Instruments Corporation 4-5 NI 6115/6120 User Manual
PFI8/GPCTR0_SOURCE DGND Input
Output
PFI8/Counter 0 Source—As an input, this is a PFI. As
an output, this is the GPCTR0_SOURCE signal. This
signal reflects the actual source connected to the
general-purpose counter 0.
PFI9/GPCTR0_GATE DGND Input
Output
PFI9/Counter 0 Gate—As an input, this is a PFI. As an
output, this is the GPCTR0_GATE signal. This signal
reflects the actual gate signal connected to the
general-purpose counter 0.
GPCTR0_OUT DGND Output
1
Counter 0 Output—This output is from the
general-purpose counter 0 output.
FREQ_OUT DGND Output Frequency Output—This output is from the frequency
generator output.
1
The GPCTR0_OUT acts as an input when using external clock mode with correlated DIO.
Table 4-3. Analog I/O Signal Summary for the NI 6115
Signal Name
Signal
Type and
Direction
Impedance
Input/
Output
Protection
(Volts)
On/Off
Source
(mA at V)
Sink
(mA at V)
Rise
Time
(ns)
Bias
ACH<0..3>+ AI 1MΩ in
parallel with
100 pF
1
or 10 kΩ in
parallel with
40 pF
2
42 V — — — ±300
pA
ACH<0..3>– AI 10 nF to
ACH<0..3>
GND
42 V — — — ±300
pA
DAC0OUT AO 50 Ω Short-circuit
to ground
5 at 10 5 at –10 — —
DAC1OUT AO 50 Ω Short-circuit
to ground
5 at 10 5 at –10 — —
1
Applies to range ≤ ±10 V, impedance refers to ACH<0..3>–.
2
Applies to range > ±10 V, impedance refers to ACH<0..3>–.
Table 4-2. Signal Descriptions for I/O Connector Pins (Continued)
Signal Name Reference Direction Description