Chapter 2
Configuration and Installation
© National Instruments Corporation
2-23
SCXI-1100 User Manual
Rear Signal Connector Signal Descriptions
Pin
Signal Name
Description
1-2
AOGND
Analog Output Ground – Connected to the PGIA
reference when jumper W10 is in position AB-R0.
3-6
MCH0
±
and MCH1
±
Analog Output Channels 0 and 1 – Connects to the
data acquisition differential analog input channels.
19
OUTREF
Output Reference – Serves as the reference node for
the PGIA output in the Pseudodifferential Output
mode. You should connect OUTREF to the analog
input sense of the NRSE data acquisition board.
24, 33
DIG GND
Digital Ground – Supply the reference for data
acquisition 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
Data Acquisition Board 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-1100 that the
data acquisition board has taken a sample; also
causes the SCXI-1100 to change channels.
37
SERCLK
Serial Clock – Taps into the SCXIbus SPICLK line
to clock the data on the MOSI and MISO lines.
43
RSVD
Reserved.
* Indicates active low.
All other pins are not connected.
See the Timing Requirements and Communication Protocol section later in this chapter for more
detailed information on timing.
The signals on the rear signal connector are analog output signals, digital I/O signals, or timing
I/O signals. Signal connection guidelines for each of these groups are given in the following
section.
