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Table Of Contents

SCXI-1121 User Manual
Support
- Worldwide Technical Support and Product Information
- National Instruments Corporate Headquarters
- Worldwide Offices
Important Information
- Warranty
- Copyright
- Trademarks
- WARNING REGARDING USE OF NATIONAL INSTRUMENTS PRODUCTS
Contents
About This Manual
- Conventions
- Related Documentation
Chapter 1 Introduction
- What Your Kit Should Contain
- Optional Software
- Optional Equipment
  - Custom Cables
- Unpacking
Chapter 2 Configuration and Installation
- Module Configuration
  - Digital Signal Connections
  - Analog Configuration
- Hardware Installation
- Signal Connections
Chapter 3 Theory of Operation
- Functional Overview
  - SCXIbus Connector
  - SCXIbus Connector Signal Descriptions
- Digital Interface
- Digital Control Circuitry
- Analog and Timing Circuitry
- Scanning Modes
  - Single-Module Parallel Scanning
  - Multiplexed Scanning
Chapter 4 Register Descriptions
- Register Description
Chapter 5 Programming
- Programming Considerations
- Scanning Examples
Appendix A Specifications
Appendix B Rear Signal Connector
Appendix C SCXIbus Connector
Appendix D SCXI-1121 Front Connector
Appendix E SCXI-1121 Cabling
Appendix F Revision A and B Photo and Parts Locator Diagrams
Appendix G Technical Support Resources
Glossary
- Numbers/Symbols
- A
- B-D
- E-H
- I-M
- N-R
- S-T
- U-W
Index
- Numbers
- A-B
- C
- D-E
- F-I
- J-M
- N-P
- R
- S
- T-V
- W
Figures
- Figure 2-1. SCXI-1121 General Parts Locator Diagram
- Figure 2-2. SCXI-1121 Detailed Parts Locator Diagram
- Figure 2-3. SCXI-1121 Front Connector Pin Assignment
- Figure 2-4. Ground-Referenced Signal Connection with High Common-Mode Voltage
- Figure 2-5. Floating Signal Connection Referenced to Chassis Ground for Better Signal-to-Noise Ratio
- Figure 2-6. Floating AC-Coupled Signal Connection
- Figure 2-7. AC-Coupled Signal Connection with High Common-Mode Voltage
- Figure 2-8. Assembling and Mounting the SCXI-1330 Connector-and-Shell Assembly
- Figure 2-9. Nulling Circuit
- Figure 2-10. Shunt Circuit
- Figure 2-11. SCXI-1320 Parts Locator Diagram
- Figure 2-12. SCXI-1328 Parts Locator Diagram
- Figure 2-13. SCXI-1321 Parts Locator Diagram
- Figure 2-14. SCXI-1121 Rear Signal Connector Pin Assignment
- Figure 2-15. SCANCLK Timing Requirements
- Figure 2-16. Slot-Select Timing Diagram
- Figure 2-17. Serial Data Timing Diagram
- Figure 2-18. Configuration Register Write Timing Diagram
- Figure 2-19. SCXI-1121 Module ID Register Timing Diagram
- Figure 3-1. SCXI-1121 Block Diagram
- Figure 3-2. SCXIbus Connector Pin Assignment
- Figure 3-3. Digital Interface Circuitry Block Diagram
- Figure 3-4. SCXI-1121 Digital Control
- Figure 3-5. Analog Input Block Diagram
- Figure 3-6. Analog Output Circuitry
- Figure 3-7. Single-Module Parallel Scanning
- Figure 3-8. Single-Module Multiplexed Scanning (Direct)
- Figure 3-9. Single-Module Multiplexed Scanning (Indirect)
- Figure 3-10. Multiple-Module Multiplexed Scanning
- Figure 3-11. Multiple-Chassis Scanning
- Figure B-1. SCXI-1121 Rear Signal Connector Pin Assignment
- Figure C-1. SCXIbus Connector Pin Assignment
- Figure D-1. SCXI-1121 Front Connector Pin Assignment
- Figure E-1. SCXI-1340 Installation
- Figure E-2. SCXI-1180 Rear Connections
- Figure E-3. SCXI-1180 Front Panel Installation
- Figure E-4. Cover Removal
- Figure F-1. Revision A and B SCXI-1121 Signal Conditioning Module
- Figure F-2. Revision A and B SCXI-1121 General Parts Locator Diagram
- Figure F-3. Revision A and B SCXI-1121 Detailed Parts Locator Diagram
Tables
- Table 2-1. Digital Signal Connections, Jumper Settings
- Table 2-2. Jumper W33 Settings
- Table 2-3. Gain Jumper Allocation
- Table 2-4. Gain Jumper Positions
- Table 2-5. Filter Jumper Allocation
- Table 2-6. Voltage and Current Mode Excitation Jumper Setup
- Table 2-7. Maximum Load per Excitation Channel
- Table 2-8. Excitation Level Jumper Selection
- Table 2-9. Completion Network Jumpers
- Table 2-10. Trimmer Potentiometer and Corresponding Channel
- Table 2-11. Nulling Resistors and Corresponding Channel
- Table 2-12. Jumper Settings of the Nulling Circuits
- Table 2-13. Jumper Settings on the SCXI-1320 Terminal Block
- Table 2-14. Jumper Settings on the SCXI-1328 Terminal Block
- Table 2-15. Jumper Settings on the SCXI-1321 Terminal Block
- Table 2-16. SCXIbus to SCXI-1121 Rear Signal Connector to Data Acquisition Board Pin Equivalences
- Table 3-1. SCXIbus Equivalents for the Rear Signal Connector
- Table 3-2. Calibration Potentiometer Reference Designators
- Table 5-1. SCXI-1121 Rear Signal Connector Pin Equivalences
- Table E-1. SCXI-1121 and MIO-16 Pinout Equivalences
- Table E-2. SCXI-1341 and SCXI-1344 Pin Translations
- Table E-3. SCXI-1342 Pin Translations
- Table E-4. SCXI-1343 Pin Connections

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

A1

B1

A2

B2

A3

B3

A4

B4

A5

B5

A6

B6

A7

B7

A8

B8

A9

B9

A10

B10

A11

B11

A12

B12

A13

B13

A14

B14

A15

B15

A16

B16

A17

B17

A18

B18

A19

B19

A20

B20

A21

B21

A22

B22

A23

B23

A24

B24

D1

C1

D2

C2

D3

C3

D4

C4

D5

C5

D6

C6

D7

C7

D8

C8

D9

C9

D10

C10

D11

C11

D12

C12

D13

C13

D14

C14

D15

C15

D16

C16

D17

C17

D18

C18

D19

C19

D20

C20

D21

C21

D22

C22

D23

C23

D24

C24

GUARD

GUARD

GUARD

AB0+

GUARD

GUARD

GUARD

GUARD

GUARD

GUARD

RESET*

MISO

V–

V–

CHSGND

CHSGND

V+

V+

+5 V

SPICLK

TRIG0

SS*

GUARD

GUARD

GUARD

GUARD

GUARD

GUARD

GUARD

GUARD

AB0–

CHSGND

CHSGND

CHSGND

CHSGND

RSVD

D*/A

INTR*

V–

V–

V+

V+

MOSI

+5 V

SCANCON

CHSGND

CHSGND

CHSGND

GUARD