National Instruments SCXI-1121 Manuel D’Utilisation

1-2

AOGND

Analog Output Ground—These pins are connected to the analog 
reference when jumper W33 is in position AB-R0.

3-12

MCH0± through 
MCH4±

Analog Output Channels 0 through 4—Connects to the data 
acquisition board differential analog input channels.

19

OUTREF

Output Reference—This pin serves as the reference node for the 
analog channels output in the Pseudodifferential Reference mode. 
It should be connected to the analog input sense of the NRSE data 
acquisition board.

24, 33

DIG GND

Digital Ground—These pins supply the reference for data 
acquisition board digital signals and are tied to the module digital 
ground.

25

SERDATIN

Serial Data In—This signal taps into the SCXIbus MOSI line to 
provide serial input data to a module or Slot 0.

26

SERDATOUT

Serial Data Out—This signal taps into the SCXIbus MISO line to 
accept serial output data from a module.

27

DAQD*/A

Data Acquisition Board Data/Address Line—This signal 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—This signal 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—This indicates to the SCXI-1121 that a sample has 
been taken by the data acquisition board and causes the SCXI-1121 
to change channels. See the 

 section later in this chapter for more 

detailed information on timing.

37

SERCLK

Serial Clock—This signal taps into the SCXIbus SPICLK line to 
clock the data on the MOSI and MISO lines. See the 

 section later in this 

chapter for more detailed information on timing.

43

RSVD

Reserved.

All other pins are not connected.