National Instruments SCXI-1121 Manual de usuario Pagina 118
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Appendix C SCXIbus Connector
SCXI-1121 User Manual C-4 www.natinst.com
Further information is given in Chapter 3, Theory of Operation.
A24 TRIG0 TRIG0—General-purpose trigger line used by the SCXI-1121 to
send SCANCLK to other modules or receive SCANCLK from
other modules. Open collector. I/O.
B24 SS* Slot Select—When low, enables module communications over
the SCXIbus. Totem pole. Input.
C24 SCANCON Scanning Control—Combination output enable and reload signal
for scanning operations. Totem pole. Input.
All other pins are not connected.
Pin
Signal
Name
Description
- SCXI-1121 User Manual 1
- Important Information 3
- Contents 4
- About This Manual 9
- Related Documentation 10
- Introduction 11
- What Your Kit Should Contain 12
- Optional Software 12
- Chapter 1 Introduction 13
- Optional Equipment 14
- Custom Cables 15
- Unpacking 16
- Module Configuration 17
- Digital Signal Connections 19
- Jumper W44 19
- Jumper W38 20
- Jumper W32 20
- Using Jumpers W32 and W38 20
- Analog Configuration 22
- Selection 22
- Input Channel Jumpers 24
- Excitation Jumpers 25
- Excitation Level 26
- Table 2-9 28
- Completion Network Jumpers 28
- 2 W27 and W28 29
- 3 W39 and W40 29
- Disable Network 29
- (Factory Setting) 29
- Hardware Installation 30
- Signal Connections 31
- Front Connector 32
- Analog Input Channels 36
- Ω resistor is 37
- Excitation Channels 38
- Temperature Sensor Connection 38
- Connector-and-Shell Assembly 38
- Terminal Blocks 40
- Table 2-10 41
- Figure 2-9. Nulling Circuit 43
- Figure 2-10. Shunt Circuit 45
- DTEMP MTEMP 48
- Warnings 49
- Terminal Block Installation 52
- Communication Signals 58
- SLOT0SEL* 61
- SERDATIN 61
- 01 00001100001111 61
- Programming 62
- Theory of Operation 63
- Chapter 3 Theory of Operation 64
- Digital Interface 68
- Digital Control Circuitry 69
- Analog and Timing Circuitry 70
- Excitation Output Channels 73
- Calibration 73
- Offset Null Adjust 74
- Excitation Adjust 75
- Analog Output Circuitry 77
- Scanning Modes 79
- Figure 3-8 80
- Register Descriptions 83
- Module ID Register 84
- Configuration Register 85
- Slot 0 Register Descriptions 87
- Slot-Select Register 88
- 765432 1 0 89
- FIFO Register 91
- Register Writes 93
- Initialization 94
- Single-Channel Measurements 95
- Direct Measurements 95
- Indirect Measurements 96
- Scanning Measurements 98
- Counter 1 and SCANDIV 100
- 2. Module Programming 101
- Chapter 5 Programming 102
- Multiple-Chassis Scanning 103
- 101S 1100 to the HSCR 105
- 101S 1110 to the HSCR 105
- 101S 1111 to the HSCR 105
- Scanning Examples 106
- Example 3 107
- Specifications 109
- Appendix A Specifications 110
- RTD Mode 111
- Strain Gauge Mode 111
- Cold-Junction Sensor 111
- Physical 112
- Environment 112
- Rear Signal Connector 113
- SCXIbus Connector 115
- Appendix C SCXIbus Connector 116
- SCXI-1121 Front Connector 119
- SCXI-1121 Cabling 123
- Appendix E SCXI-1121 Cabling 124
- SCXI-1340 Installation 125
- Lab-LC Cable Assembly 126
- SCXI-1180 Feedthrough Panel 130
- SCXI-1180 Installation 131
- SCXI-1302 Wiring Procedure 132
- SCXI-1302 Installation 133
- SCXI-1351 Installation 134
- SCXI-1350 Installation 135
- SCXI-1343 Installation 136
- Revision A and B Photo and 139
- Parts Locator Diagrams 139
- Technical Support Resources 142
- Worldwide Support 143
- Glossary 144
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