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Chapter 4 Connecting Signals
© National Instruments Corporation 4-3 NI 6115/6120 User Manual
I/O Connector Signal Descriptions
Table 4-2. Signal Descriptions for I/O Connector Pins
Signal Name Reference Direction Description
ACH<0..3>GND — — Ground for Analog Input Channels 0 through 3—These
pins are the bias current return point for
pseudodifferential measurements.
ACH<0..3>+ ACH<0..3>GND Input Analog Input Channels 0 through 3 (+)—These pins
are routed to the (+) terminal of the respective channel
amplifier and carry the input signal.
ACH<0..3>– ACH<0..3>GND Input Analog Input Channels 0 through 3 (–)—These pins are
routed to the (–) terminal of the respective channel
amplifier and are the DC reference for the (+) input
signal of that channel.
DAC0OUT AOGND Output Analog Channel 0 Output—This pin supplies the
voltage output of AO channel 0.
DAC1OUT AOGND Output Analog Channel 1 Output—This pin supplies the
voltage output of AO channel 1.
AOGND — — Analog Output Ground—The AO voltages are
referenced to this node.
DGND — — Digital Ground—This pin supplies the reference for the
digital signals at the I/O connector as well as the
+5 VDC supply.
DIO<0..7> DGND Input
Output
Digital I/O Signals—DIO6 and 7 can control the
up/down signal of general-purpose counters 0 and 1,
respectively.
+5V DGND Output +5 VDC Source—These pins are fused for up to 1 A of
+5 V supply. The fuse is self-resetting.
SCANCLK DGND Output Scan Clock—This pin pulses once for each A/D
conversion when enabled. The low-to-high edge
indicates when the input signal can be removed from
the input or switched to another signal.
EXTSTROBE* DGND Output External Strobe—This output can be toggled under
software control to latch signals or trigger events on
external devices.