Chapter 1
Introduction to SCXI
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National Instruments Corporation
1-5
The SCXI-2000 chassis also includes a communication processor that you
can use to connect the SCXI system directly to the RS-232 serial port of a
computer, or to an RS-485 network for long-distance data acquisition.
Figure 1-3.
SCXI Chassis Signal Routing
SCXI Modules
National Instruments manufactures a variety of SCXI modules for use in
SCXI chassis. Various analog input modules can multiplex, amplify, filter,
and isolate voltage and current signals. Some modules have excitation
potentials or currents and half-bridge completion networks for transducers
such as strain gauges or resistive temperature devices (RTDs). Digital
modules isolate digital signals through relays or optocouplers.
With the SCXI-1181 breadboard module, you can easily implement custom
signal conditioning circuits.
The SCXI-2400 module is a serial communication module with the
same RS-232 and RS-485 capabilities as the SCXI-2000 chassis.
Use the SCXI-2400 in an RS-485 network for remote or long-distance
data acquisition.
SCXI-1000
SCXI
M
AIN
FR
AM
E
Unconditioned Signals
from Transducers
Analog and Digital
Bus Backplane
Conditioned Signals to
DAQ Device or Digitized Volatage
Values to Parallel or Serial Port
