Chapter 2 Connecting Signals
© National Instruments Corporation 2-11 SCXI-1503 User Manual
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. AI0 is used to
differentially multiplex all 16 channels, the CJ sensor, and analog signals
from the modules to the connected DAQ device.
The communication signals between the DAQ device and the SCXI system
are listed in Table2-4. If the DAQ device is connected to the SCXI-1503,
these digital lines are unavailable for general-purpose digital I/O.
Table 2-4. SCXI-1503 50-Pin Rear Connector Signals
Pin
SCXI
SignalNa me
NI-DAQmx
Device Signal
Name Direction Description
1, 2 AI GND AI GND —Analog input ground—connects to
the analog input ground of the DAQ
device.
3AI 0 + AI 0 + Input Channel 0 positive—used to
differentially multiplex all
16 channels, the CJ sensor, and
analog signals from the modules to
the connected DAQ device.
4AI 0 – AI 0 – Input Channel 0 negative—used to
differentially multiplex all
16 channels, the CJ sensor, and
analog signals from the modules to
the connected DAQ device.
24, 33 DIG GND D GND —Digital ground—these pins supply
the reference for E/M Series DAQ
device digital signals and are
connected to the module digital
ground.
25 SERDAT IN P0.0 Input Serial data in—this signal taps into
the SCXIbus MOSI line to send
serial input data to a module or
Slot 0.