© National Instruments Corporation
3-1
SCXI-1162 User Manual
Chapter 3
Theory of Operation
This chapter contains a functional overview of the SCXI-1162 module and explains the operation
of each functional unit making up the SCXI-1162.
Functional Overview
The block diagram in Figure 3-1 illustrates the key functional components of the SCXI-1162.
Vcc
Vcc
In 29
In 30
In 31
In 28
In 1
In 2
In 3
In 0
Port 0
Port 7
SCXIbus
Digital
Interface
Rear Signal
Connector
Module
ID
Address
Handler
Data
Register
Front Connector
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•
•
•
•
•
•
•
•
4
4
Figure 3-1. SCXI-1162 Block Diagram
The major components of the SCXI-1162 are as follows:
•
SCXIbus connector
•
Register circuitry
•
Digital interface circuitry
•
Optically isolated input channels
The SCXI-1162 module is dedicated to acquiring digital signals in the presence of common-
mode voltages. The theory of operation of each of the SCXI-1162 components is explained in
the rest of this chapter.
