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SCXI-1121
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162 pages, 1.93 Mb
Chapter 2
Configuration and Installation
SCXI-1121 User Manual
2-34
www.natinst.com
Figure 2-11.
SCXI-1320 Parts Locator Diagram
Contents
Main
Page
Important Information
Warranty
Copyright
Trademarks
WARNING REGARDING USE OF NATIONAL INSTRUMENTS PRODUCTS
Contents
About This Manual
Chapter 1 Introduction
Chapter 2 Configuration and Installation
Chapter 3 Theory of Operation
Chapter 4 Register Descriptions
Chapter 5 Programming
Page
Figures
Tables
About This Manual
Conventions
Related Documentation
Introduction
What Your Kit Should Contain
Optional Software
Page
Optional Equipment
Equipment Part Number
Custom Cables
Unpacking
Configuration and Installation
Module Configuration
Page
Digital Signal Connections
Jumper W44
Jumper W38
Jumper W32
Using Jumpers W32 and W38
Page
Analog Configuration
Grounding, Shielding, and Reference Mode Selection
Jumper W33
Page
Input Channel Jumpers
Gain Jumpers
Filter Jumpers
Excitation Jumpers
Current and Voltage Excitation Jumpers
Excitation Level
Table 2-6. Voltage and Current Mode Excitation Jumper Setup
Excitation Channel Jumpers Voltage Mode
(Factory Setting) Current Mode 0W14 and W15 1W22 and W23 2W34 and W35 3W46 and W47
Page
Using the Internal Half-Bridge Completion
Chapter 2 Configuration and Installation
National Instruments Corporation 2-13 SCXI-1121 User Manual
2W27 and W28
3W39 and W40
Table 2-9. Completion Network Jumpers (Continued)
Channel Jumpers Enable Completion Disable Network
(Factory Setting)
Hardware Installation
Signal Connections
Front Connector
Figure 2-3. SCXI-1121 Front Connector Pin Assignment
Front Connector Signal Descriptions
Page
Analog Input Channels
Page
Excitation Channels
Temperature Sensor Connection
Connector-and-Shell Assembly
Page
SCXI-1320, SCXI-1328, and SCXI-1321 TerminalBlocks
SCXI-1320 and SCXI-1328 Terminal Blocks
SCXI-1321 Offset-Null and Shunt-Calibration Terminal Block
Page
Page
Page
Page
Terminal Block Temperature Sensor
Terminal Block Jumper Configuration
Page
Terminal Block Signal Connection
Page
Page
Terminal Block Installation
Rear Signal Connector
Note If you are using the SCXI-1121 with a National Instruments data acquisition board
Figure 2-14. SCXI-1121 Rear Signal Connector Pin Assignment
Rear Signal Connector Signal Descriptions
Analog Output Signal Connections
Digital I/O Signal Connections
Page
Timing Requirements and Communication Protocol
Timing Signal
Communication Signals
Page
Page
Page
Page
National Instruments Corporation 3-1 SCXI-1121 User Manual
Theory of Operation
Figure 3-1. SCXI-1121 Block Diagram
Functional Overview
The block diagram in Figure 3-1 illustrates the key functional components of the SCXI-1121.
Page
Chapter 3 Theory of Operation
National Instruments Corporation 3-3 SCXI-1121 User Manual
SCXIbus Connector
Figure 3 -2 shows the pin assignments for the SCXIbus connector.
Figure 3-2. SCXIbus Connector Pin Assignment
SCXIbus Connector Signal Descriptions
Page
Digital Interface
Digital Control Circuitry
Analog and Timing Circuitry
Analog Input Channels
Figure 3-5. Analog Input Block Diagram
Page
Excitation Output Channels
Calibration Calibration Equipment Requirements
Offset Null Adjust
Excitation Adjust
Page
Analog Output Circuitry
Page
Scanning Modes
Single-Module Parallel Scanning
Multiplexed Scanning
Single-Module Multiplexed Scanning
Single-Module Multiplexed Scanning (Direct)
Single-Module Multiplexed Scanning (Indirect)
Chapter 3 Theory of Operation
National Instruments Corporation 3-19 SCXI-1121 User Manual
Multiple-Module Multiplexed Scanning
Figure 3-10. Multiple-Module Multiplexed Scanning
Multiple-Chassis Scanning
Register Descriptions
Register Description
Register Description Format
SCXI-1121 Registers
Module ID Register
Configuration Register
Page
Slot 0 Register Descriptions
Slot-Select Register
Hardscan Control Register (HSCR)
Page
FIFO Register
Programming
Programming Considerations
Notation
Register Writes
Register Selection and Write Procedure
Initialization
Single-Channel Measurements
Direct Measurements
Parallel Output
Multiplexed Output
Indirect Measurements
Measurements from Other Modules
Measurements from the SCXI-1121 via Another Module
Scanning Measurements
1. Data Acquisition Board Setup Programming
Page
Counter 1 and SCANDIV
2. Module Programming
Single-Module Parallel Scanning
Single-Module Multiplexed Scanning (Direct)
Single-Module Multiplexed Scanning (Indirect)
Multiple-Module Multiplexed Scanning
Multiple-Chassis Scanning
3. Programming the Slot 0 Hardscan Circuitry
4. Acquisition Enable, Triggering, and Servicing
Scanning Examples
Example 1
Example 2
Example 3
Page
A
Specifications
Analog Input
Page
RTD Mode
Strain Gauge Mode
Cold-Junction Sensor
Physical
Environment
Safety
B
Rear Signal Connector
Figure B-1. SCXI-1121 Rear Signal Connector Pin Assignment
Rear Signal Connector Signal Descriptions
Page
Appendix C SCXIbus Connector
SCXI-1121 User Manual C-2 www.natinst.com
FigureC -1 shows the pin assignments for the SCXI-1121 SCXIbus
Figure C-1. SCXIbus Connector Pin Assignment
SCXIbus Connector Signal Descriptions
Page
Page
Appendix D SCXI-1121 Front Connector
SCXI-1121 User Manual D-2 www.natinst.com
FigureD -1 shows the pin assignments for the SCXI-1121 front connector.
Figure D-1. SCXI-1121 Front Connector Pin Assignment
Front Connector Signal Descriptions
Page
E
SCXI-1121 Cabling
SCXI-1340 Cable Assembly
Page
SCXI-1340 Installation
SCXI-1341 Lab-NB, Lab-PC, or Lab-PC+ and SCXI-1344 Lab-LC Cable Assembly
Page
SCXI-1341 and SCXI-1344 Installation
SCXI-1342 PC-LPM-16 Cable Assembly
Page
SCXI-1342 Installation
SCXI-1180 Feedthrough Panel
SCXI-1180 Installation
SCXI-1302 50-Pin Terminal Block
SCXI-1302 Wiring Procedure
SCXI-1302 Installation
SCXI-1351 One-Slot Cable Extender
SCXI-1351 Installation
SCXI-1350 Multichassis Adapter
SCXI-1350 Installation
SCXI-1343 Rear Screw Terminal Adapter
SCXI-1343 Installation
Page
Page
F
Page
Page
G
Technical Support Resources
NI Web Support
Online Problem-Solving and Diagnostic Resources
Software-Related Resources
Worldwide Support
Glossary
Numbers/Symbols
A
B
C
D
Page
Page
Page
S
T
U
V
W
Index
Numbers
A
B
C
D
E
F
G
H
I
J
L
M
N
O
P
R
S
Page
Page
T
U
V
W
