
Chapter 4 Connecting Signals
NI PCI-6110/6111 User Manual 4-6 ni.com
GPCTR0_OUT DGND Output 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.
Table 4-3.  I/O Signal Summary for the  NI PCI-6110/6111Signal Name
Signal 
Type and 
Direction
Impedance 
Input/
Output
Protection 
(Volts) 
On/Off
Source 
(mA at V)
Sink 
(mA atV)
Rise 
Time 
(ns) Bias
ACH<0..3>+ AI 1MΩ
in parallel
with
100pF1
1MΩ 
in parallel
with
10pF2
42 V — — — —
ACH<0..3>– AI 10nF  42 V — — — ±200 pA
ACH<0..3>GND AI — — — — — —
DAC0OUT AO 50ΩShort-circuit 
to ground
5 at 10 5 at –10 300 
V/µs
—
DAC1OUT  AO 50ΩShort-circuit 
to ground
5 at 10 5 at –10 300 
V/µs
—
AOGND AO — — — — — —
DGND DO — — — — — —
VCC DO 0.1ΩShort-circuit 
to ground
1 A — — —
DIO<0..7> DIO — Vcc +0.5 13 at (Vcc –0.4) 24 at0.4 1.1 50kΩ pu
SCANCLK DO — — 3.5 at (Vcc –0.4) 5 at 0.4 1.5 50 kΩ pu
EXTSTROBE* DO — — 3.5 at (Vcc –0.4) 5 at 0.4 1.5 50 kΩ pu
PFI0/TRIG1 AI/DIO 10kΩ±35 Vcc +0.5 3.5 at (Vcc –0.4) 5 at 0.4 1.5 9kΩ pu 
and 
10kΩ pd 
PFI1/TRIG2 DIO — Vcc +0.5 3.5 at (Vcc –0.4) 5 at 0.4 1.5 50 kΩ pu
PFI2/CONVERT* DIO — Vcc +0.5 3.5 at (Vcc –0.4) 5 at 0.4 1.5 50 kΩ pu
Table 4-2.  Signal Descriptions for I/O Connector Pins (Continued)
Signal Name Reference Direction Description