Network Card User Manual
Table Of Contents
- SCXI-1121 User Manual
- Support
- Important Information
- Contents
- About This Manual
- Chapter 1 Introduction
- Chapter 2 Configuration and Installation
- Chapter 3 Theory of Operation
- Chapter 4 Register Descriptions
- Chapter 5 Programming
- 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
- Index
- 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 5 Programming
© National Instruments Corporation 5-9 SCXI-1121 User Manual
Follow the instructions in these sections through the part labeled as follows:
• Clear the A/D Circuitry and Reset the Mux Counter in the MIO board
user manual (except for the AT-MIO-16X and the AT-MIO-64F-5). Do
not continue to the part called Enable the Scanning Data Acquisition
Operation. You will do this after you program the modules and Slot 0.
• Program the Sample Counter (if you are doing continuous channel
scanning) or Program the Scan-Interval Counter (if you are doing
interval channel scanning) in the AT-MIO-16X or AT-MIO-64F-5 user
manual. Do not continue to the part labeled Enable a Scanning Data
Acquisition Operation or Enable an Interval Scanning Data
Acquisition Operation. You will do this after you program the modules
and Slot 0.
Note For multiplexed scanning with an MIO board, it is important that you follow the
instructions in the channel-scanning sections, not the single-channel sections. Although
you may be using only one MIO board channel, the channel scanning programming will
ensure that the MIO board outputs SCANCLK, which is needed by the SCXI-1120 and
Slot 0.
• Clear the A/D Circuitry in the Lab-LC User Manual. Do not continue
to the part called Program the Sample-Interval Counter. You will do
this after you program the modules and Slot 0.
• Clear the A/D Circuitry in the Lab-PC User Manual, the Lab-PC+
User Manual, and the PC-LPM-16 User Manual. Do not continue to
the part called Start and Service the Data Acquisition Operation. You
will do this after you program the modules and Slot 0.
• Clear the A/D Circuitry in the Lab-NB User Manual. Do not continue
to the part called Program the Sample-Interval Counter (Counter A0).
You will do this after you program the modules and Slot 0.
Counter 1 and SCANDIV
All MIO boards can operate their data acquisition board scan lists in two
ways—they can acquire one sample per data acquisition board scan list
entry or they can acquire N samples per data acquisition board scan list
entry, where N is a number from 2 to 65,535 that is programmed in
Counter 1. This second method of operation is especially useful when the
data acquisition board scan list length is limited to 16 entries, as it is on all
MIO boards except the AT-MIO-16F-5, which can have up to 512 entries.
Because you can multiplex many SCXI-1121s in one chassis to one MIO
board channel, often the simplest way to program the MIO board is to use
only one data acquisition board scan list entry, and make N the total number
of samples to be taken on all modules in one scan. Check your MIO board
user manual for limitations in the data acquisition board scan list format.