Chapter 3
Signal Connections
SCXI-1102/B/C User Manual
3-8
©
National Instruments Corporation
Rear Signal Connector Descriptions
The rear signal connector on the cabled module is the interface between
the DAQ device and all modules in the SCXI chassis.
Pin
Signal Name
Direction
Description
1, 2
AOGND
Output
Negative Module Analog Output—With software, you
can configure these pins to connect to the analog
reference.
3
MCH0+
Output
Positive Module Analog Output—This pin connects to
the positive side of the differential analog input channel
0 of the DAQ device.
4
MCH0-
Output
Negative Module Analog Output—In the reset state of
the module, this pin is configured to connect to the
analog reference.
19
OUTREF
Output
Negative Module Analog Output—With software, you
can configure this pin to connect to the analog reference.
24, 33
DGND
—
Digital Ground—These pins supply the reference for
DAQ device digital signals and are tied to the module
digital ground.
25
SERDATIN
Input
Serial Data In—The DAQ device uses this signal to
program modules in all slots.
26
SERDATOUT
Output
Serial Data Out—A cabled module uses this signal to
return data from any module to the DAQ device.
27
DAQD*/A
Input
DAQ Device Data/Address Line—The DAQ device
asserts this signal to indicate to the module whether the
incoming serial stream is data or address information.
29
SLOT0SEL*
Input
Slot 0 Select—The DAQ device asserts this signal low
to indicate that the SERDATIN line information is going
to the Slot 0 controller instead of a module.
36
SCANCLK
Input
Scan Clock—A rising edge indicates to the scanned
SCXI module that the DAQ device has taken a sample
and causes the module to advance channels.
