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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

This chapter describes in detail the SCXI-1121 Module ID Register, the

Configuration Register, the Slot 0 registers, and multiplexer addressing.

Note

If you plan to use a programming software package such as NI-DAQ, LabWindows,

or LabVIEW with your SCXI-1121 board, you do not need to read this chapter.

The register description chapter discusses each of the SCXI-1121 registers

and the Slot 0 registers. A detailed bit description of each register is given.

The individual register description gives the type, word size, and bit map

of the register, followed by a description of each bit.

The register bit map shows a diagram of the register with the MSB shown

on the left (bit 15 for a 16-bit register, bit 7 for an 8-bit register), and the

LSB shown on the right (bit 0). A rectangle is used to represent each bit.

Each bit is labeled with a name inside its rectangle. An asterisk (*) after the

bit name indicates that the bit is inverted (negative logic). The Module ID

In many of the registers, several bits are labeled with an X, indicating don’t