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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 2 Configuration and Installation

SCXI-1121 User Manual 2-36 www.natinst.com

Figure 2-13. SCXI-1321 Parts Locator Diagram

Terminal Block Installation

To connect the terminal block to the SCXI-1121 front connector, perform

the following steps:

1. Connect the SCXI-1121 front connector to its mating connector on the

terminal block.

2. Make sure that the SCXI-1121 top and bottom thumbscrews do not

obstruct the rear panel of the terminal block.

3. Tighten the top and bottom screws on the back of the terminal block to

hold it securely in place.