Chapter4 SignalConnections
6023E/6024E/6025EUser Manual 4-4 ni.com
Table4-2 shows the I/O connector signal descriptions for the 6023E,6024E, and 6025E.

Table4-2. I/OConnector Signal Descriptions

SignalName Reference Direction Description
AIGND — — Analoginput ground—these pins are the reference point for
single-endedmeasurements in RSE configuration and the
biascurrent return point for DIFF measurements. All three
groundreferences—AIGND, AOGND, and DGND—are
connectedon your device.
ACH<0..15> AIGND Input Analoginput channels 0 through 15—you can configure
eachchannel pair, ACH<i, i+8> (i= 0..7), as either one
DIFFinput or two single-ended inputs.
AISENSE AIGND Input Analoginput sense—this pin serves as the reference node
forany of channels ACH <0..15> in NRSE configuration.
DAC0OUT1AOGND Output Analog channel 0 output—this pin supplies the voltage
outputof analog output channel 0.
DAC1OUT1AOGND Output Analog channel 1 output—this pin supplies the voltage
outputof analog output channel 1.
AOGND — — Analogoutput ground—the analog output voltages are
referencedto this node. All three ground
references—AIGND,AOGND,and DGND—are connected
togetheron your device.
DGND — — Digitalground—this pin supplies the reference for the
digitalsignals at the I/O connector as well as the +5 VDC
supply.All three ground references—AIGND, AOGND,
andDGND—are connected on your device.
DIO<0..7> DGND Inputor
Output
DigitalI/O signals—DIO6 and 7 can control the up/down
signalof general-purpose counters 0 and 1, respectively.
PA<0 ..7 >2DGND Input or
Output
PortA bidirectional digital data lines for the 82C55A
programmableperipheral interface on the 6025E. PA7
isthe MSB. PA0 is the LSB.
PB<0..7>2DGND Inputor
Output
PortB bidirectional digital data lines for the 82C55A
programmableperipheral interface on the 6025E. PB7
isthe MSB. PB0 is the LSB.
PC<0..7>2DGND Inputor
Output
PortC bidirectional digital data lines for the 82C55A
programmableperipheral interface on the 6025E. PC7
isthe MSB. PC0 is the LSB.
+5V DGND Output +5 VDC Source—these pins are fused for up to 1 A of
+5V supply on the PCI and PXI devices, or up to 0.75 A
froma DAQCard device. The fuse is self-resetting.