National Instruments SCXI-1121 - Manual (Page 7)

Contents
SCXI-1121 User Manual viii www.natinst.com
Figures
Figure 2-1. SCXI-1121 General Parts Locator Diagram ......................................... 2-2
Figure 2-2. SCXI-1121 Detailed Parts Locator Diagram ........................................ 2-3
Figure 2-3. SCXI-1121 Front Connector Pin Assignment ...................................... 2-18
Figure 2-4. Ground-Referenced Signal Connection with
High Common-Mode Voltage .............................................................. 2-21
Figure 2-5. Floating Signal Connection Referenced to Chassis Ground for
Better Signal-to-Noise Ratio................................................................. 2-21
Figure 2-6. Floating AC-Coupled Signal Connection ............................................. 2-22
Figure 2-7. AC-Coupled Signal Connection with High Common-Mode Voltage .. 2-22
Figure 2-8. Assembling and Mounting the SCXI-1330
Connector-and-Shell Assembly ............................................................ 2-25
Figure 2-9. Nulling Circuit ...................................................................................... 2-29
Figure 2-10. Shunt Circuit ......................................................................................... 2-30
Figure 2-11. SCXI-1320 Parts Locator Diagram....................................................... 2-36
Figure 2-12. SCXI-1328 Parts Locator Diagram....................................................... 2-37
Figure 2-13. SCXI-1321 Parts Locator Diagram....................................................... 2-38
Figure 2-14. SCXI-1121 Rear Signal Connector Pin Assignment ............................ 2-39
Figure 2-15. SCANCLK Timing Requirements ........................................................ 2-43
Figure 2-16. Slot-Select Timing Diagram ................................................................. 2-44
Figure 2-17. Serial Data Timing Diagram ................................................................. 2-45
Figure 2-18. Configuration Register Write Timing Diagram .................................... 2-46
Figure 2-19. SCXI-1121 Module ID Register Timing Diagram ............................... 2-47
Figure 3-1. SCXI-1121 Block Diagram................................................................... 3-1
Figure 3-2. SCXIbus Connector Pin Assignment.................................................... 3-3
Figure 3-3. Digital Interface Circuitry Block Diagram ........................................... 3-6
Figure 3-4. SCXI-1121 Digital Control................................................................... 3-7
Figure 3-5. Analog Input Block Diagram................................................................ 3-9
Figure 3-6. Analog Output Circuitry ....................................................................... 3-15
Figure 3-7. Single-Module Parallel Scanning ......................................................... 3-17
Figure 3-8. Single-Module Multiplexed Scanning (Direct) .................................... 3-18
Figure 3-9. Single-Module Multiplexed Scanning (Indirect) .................................. 3-19
Figure 3-10. Multiple-Module Multiplexed Scanning............................................... 3-19
Figure 3-11. Multiple-Chassis Scanning ................................................................... 3-20
Figure B-1. SCXI-1121 Rear Signal Connector Pin Assignment ............................ B-1
Figure C-1. SCXIbus Connector Pin Assignment.................................................... C-2
Figure D-1. SCXI-1121 Front Connector Pin Assignment ...................................... D-2
Figure E-1. SCXI-1340 Installation ......................................................................... E-4