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Chapter 5
Theory of Operation
Functional Unit Description
Rear Signal Connector, SCXIbus Connector, and SCXIbus Interface
Digital Control Circuitry
SCXI-1104/C User Manual
The major components of the SCXI-1104/C module are as follows:
•
Rear signal connector
•
SCXIbus connector
•
SCXIbus interface
•
Digital control circuitry
•
Analog circuitry
•
Front signal connector
The SCXI-1104/C modules consist of 32 multiplexed input channels, each
capable of measuring medium voltages. Each input channel has its own
lowpass filter and amplifier. The SCXI-1104/C module also has a digital
section for automatic control of channel scanning.
The SCXIbus controls the SCXI-1104/C module. The SCXIbus interface
connects the rear signal connector to the SCXIbus, allowing a DAQ device
to control the SCXI-1104/C module and the rest of the chassis.
The digital control circuitry consists of the Address Handler and the
following registers:
•
Module ID
•
Configuration
•
EEPROM
•
Channel
The Address Handler controls which register is being addressed. The
Module ID Register contains a code unique to each type of SCXI-1104
module:
•
SCXI-1104—The Module ID is 45 decimal.
•
SCXI-1104C—The Module ID is 47 decimal.
5-2
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