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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

Digital Control Circuitry

Figure 3-4 diagrams the SCXI-1121 digital control.

Figure 3-4.

SCXI-1121 Digital Control

The digital control section consists of the Configuration Register and the

Module ID Register.

The Configuration Register is a two-byte, serial-in parallel-out shift

acquisition board when SS* is enabled and D*/A indicates data transfer

(D*/A low). The Configuration Register provides temperature channel

selection and channel selection, and configures the SCXI-1121 for

scanning options. All the control bits are fed into a latch before being

routed to the rest of the module. The channel-select bits are taken directly

from the shift register. Complete descriptions of the register bits are given

in Chapter 4, Register Descriptions. Writes to the Configuration Register

require the following steps:

1. SS* goes low, enabling communication with the board.

2. D*/A goes low, indicating that the information sent on the MOSI line

is data.

Module ID Register

Configuration

Serial Data Out

Input Channel

Select

Output

Stage

Control

Hardware

Scan

Control

SCANCLK

Path

Control

Buffered

Serial Data In

Buffered Digital

Control Signals