Chapter 1
Introduction to SCXI
1-4
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Figure 1-2.
SCXI System Components
SCXI Chassis
The SCXI chassis houses the SCXI modules, supplying power and
controlling the SCXIbus. National Instruments offers four SCXI chassis:
•
SCXI-1000 4-slot chassis
•
SCXI-1000DC 4-slot, DC-powered chassis
•
SCXI-1001 12-slot chassis
•
SCXI-2000 4-slot, RS-232/485 serial communication chassis
The rugged aluminum SCXI chassis contains an analog bus, a digital bus,
and a chassis controller that regulates bus operation, as shown in
Figure 1-3. The analog bus transfers analog signals from all resident analog
input modules to the DAQ device using a connection from one of the
modules to the DAQ device. The digital lines of the DAQ device
communicate with the SCXI chassis controller and manipulate the digital
bus, which controls chassis operation.
Plug-in
DAQ Device
SCXI Cable Assembly
SCXI Chassis
SCXI Module
SCXI Terminal Block or
Terminal Block Extension (TBX)
SCXI Terminal Block or
Terminal Block Extension (TBX)
Cable to
Parallel or
Serial Port
SCXI Chassis
(with one SCXI-1200)
SCXI Module
Computer
Computer
