Chapter 3 Signal Connections
© National Instruments Corporation 3-9 SCXI-1120/D User Manual
Rear Connector Signal Descriptions
SCXI-1120/D rear connector signal descriptions are listed in Table 3-2.
Table 3-2.
Rear Connector Signal Descriptions
Pin Signal Name Description
1–2 AOGND Analog Output Ground—Connected to the analog reference when
jumper W46 is in position AB-R0.
3–18 MCH0±
through
MCH7±
Analog Output Channels 0 through 7—Connects to the DAQ device
differential analog input channels.
19 OUTREF Output Reference—Serves as the reference node for the analog
output channels and the temperature sensor—in the DTS mode—in
the NRSE mode. It should be connected to the analog input sense of
the NRSE DAQ device.
24, 33 DIG GND Digital Ground—Supply the reference for DAQ device digital
signals and are tied to the module digital ground.
25 SERDATIN Serial Data In—Taps into the SCXIbus MOSI line to provide serial
input data to a module or slot 0.
26 SERDATOUT Serial Data Out—Taps into the SCXIbus MISO line to accept serial
output data from a module.
27 DAQD*/A DAQ Device Data/Address Line—Taps into the SCXIbus D*/A line
to indicate to the module whether the incoming serial stream is data
or address information.
29 SLOT0SEL* Slot 0 Select—Taps into the SCXIbus INTR* line to indicate
whether the information on MOSI is being sent to a module or
slot 0.
36 SCANCLK Scan Clock—Indicates to the SCXI-1120/D that a sample has been
taken by the DAQ device and causes the SCXI-1120/D to change
channels.
37 SERCLK Serial Clock—This signal taps into the SCXIbus SPICLK line to
clock the data on the MOSI and MISO lines.
43 RSVD Reserved.
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