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Chapter 9 Digital Routing and Clock Generation
NI 6124/6154 User Manual 9-4 ni.com
Real-Time System Integration (RTSI)
Real-Time System Integration (RTSI) is a set of bused signals among
devices that allows you to do the following:
• Use a common clock (or timebase) to drive the timing engine on
multiple devices
• Share trigger signals between devices
Many National Instruments DAQ, motion, vision, and CAN devices
support RTSI.
In a PCI system, the RTSI bus consists of the RTSI bus interface and a
ribbon cable. The bus can route timing and trigger signals between several
functions on as many as five DAQ, vision, motion, or CAN devices in the
computer.
In a PXI Express system, the RTSI bus consists of the RTSI bus interface
and the PXI trigger signals on the PXI backplane. This bus can route timing
and trigger signals between several functions on as many as seven DAQ
devices in the system.
RTSI Connector Pinout
(NI 6154 Only) Figure 9-2 shows the RTSI connector pinout and Table 9-1
describes the RTSI signals.
Table 9-1. RTSI Signals
Terminal RTSI Bus Signal
1–18 Not Connected. Do not connect
signals to these terminals.
19, 21, 23, 25, 27, 29, 31, 33 DGND
20 RTSI 0
22 RTSI 1
24 RTSI 2
26 RTSI 3
28 RTSI 4
30 RTSI 5
- DAQ S Series 1
- Important Information 3
- Compliance 4
- Chapter 5 6
- Chapter 6 7
- Chapter 7 7
- Counters 7
- Chapter 8 9
- Chapter 9 9
- Contents 10
- About This Manual 11
- Related Documentation 12
- LabWindows/CVI 13
- Measurement Studio 13
- Training Courses 15
- Technical Support on the Web 15
- Getting Started 16
- Installing the Hardware 17
- Device Self-Calibration 17
- Device Pinouts 18
- Device Specifications 18
- DAQ System Overview 19
- DAQ Hardware 20
- DAQ-STC2 21
- Calibration Circuitry 22
- Signal Conditioning 23
- Sensors and Transducers 23
- NI-DAQ\Examples\ 24
- DAQmx ANSI C Dev 24
- I/O Connector 25
- Specifications 26
- +5 V Power Source 27
- Analog Input 28
- (NI 6154 Only) The digital 29
- Input Polarity and Range 30
- Working Voltage Range 31
- AI Data Acquisition Methods 31
- Chapter 4 Analog Input 32
- Analog Input Triggering 33
- Types of Signal Sources 34
- Non-Isolated Devices 36
- DC-Coupled 37
- AC-Coupled 38
- Field Wiring Considerations 38
- Analog Input Timing Signals 40
- AI Sample Clock Signal 41
- Using an Internal Source 41
- Using an External Source 42
- Terminal 42
- Other Timing Requirements 42
- AI Convert Clock Signal 43
- AI Hold Complete Event Signal 45
- AI Start Trigger Signal 45
- Using a Digital Source 45
- Using an Analog Source 46
- AI Reference Trigger Signal 46
- Analog Output 49
- AO Data Generation Methods 50
- Chapter 5 Analog Output 51
- Analog Output Triggering 52
- AO Sample Clock Signal 54
- AO Start Trigger Signal 57
- AO Pause Trigger Signal 58
- Digital I/O 60
- Chapter 6 Digital I/O 61
- DI Sample Clock Signal 63
- DO Sample Clock Signal 64
- Counter Input Applications 74
- Chapter 7 Counters 75
- Pulse-Width Measurement 76
- Period Measurement 78
- Single Period Measurement 78
- Buffered Period Measurement 79
- Semi-Period Measurement 79
- Frequency Measurement 81
- Figure 7-11. Method 1b 82
- Figure 7-12. Method 2 83
- Figure 7-13. Method 3 84
- Position Measurement 86
- Channel Z Behavior 87
- 8 9 0 2 1 7 4 3 88
- Counter Output Applications 91
- Pulse Train Generation 93
- Finite Pulse Train Generation 94
- Frequency Generation 95
- Using the Frequency Generator 95
- Frequency Division 96
- Pulse Generation for ETS 96
- Counter Timing Signals 97
- Counter n Source Signal 98
- Counter n Gate Signal 99
- Counter n Aux Signal 100
- Counter n Up_Down Signal 101
- Counter n HW Arm Signal 101
- Default Counter/Timer Pinouts 102
- Counter Triggering 103
- Other Counter Features 104
- Prescaling 105
- Duplicate Count Prevention 106
- (No Duplicate Counting) 107
- (Duplicate Counting) 108
- Synchronization Modes 109
- 80 MHz Source Mode 110
- Other Internal Source Mode 111
- External Source Mode 111
- Programmable Function 112
- Interfaces (PFI) 112
- PFI for Isolated Devices 113
- Connecting PFI Input Signals 117
- PFI Filters 117
- Figure 8-5. Filter Example 118
- Table 8-1. Filters 118
- I/O Protection 119
- Programmable Power-Up States 119
- Digital Routing and Clock 121
- Generation 121
- 80 MHz Timebase 122
- 20 MHz Timebase 122
- 100 kHz Timebase 122
- External Reference Clock 122
- 10 MHz Reference Clock 123
- RTSI Connector Pinout 124
- Using RTSI as Outputs 125
- RTSI Filters 126
- Figure 9-3. Filter Example 127
- Table 9-2. Filters 127
- PXI Clock and Trigger Signals 128
- PXI_STAR Filters 129
- Routing Signals in Software 130
- Bus Interface 131
- Data Transfer Methods 132
- Triggering 133
- Digital Trigger 134
- Analog Trigger Types 135
- Analog Comparison Event 136
- Chapter 11 Triggering 137
- Analog Trigger Accuracy 138
- Device-Specific Information 139
- NI 6124 I/O Connector Pinout 140
- NI 6124 Block Diagram 142
- Using BNCs 143
- Using Screw Terminals 143
- NI 6124 Specifications 144
- NI 6154 Analog Output 145
- NI 6154 I/O Connector Pinout 146
- NI 6154 Block Diagram 148
- Table A-3. Ground Symbols 149
- Digital Isolation 150
- NI 6154 Specifications 151
- Technical Support and 152
- Professional Services 152
- Glossary 154
- Numerics 165
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