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NI cDAQ-918x/919x User Manual
© National Instruments | vii
Chapter 4
Digital Input/Output and PFI
Digital Input/Output ......................................................................................................... 4-1
Serial DIO versus Parallel DIO Modules ................................................................. 4-1
Static DIO ................................................................................................................. 4-2
Digital Input.............................................................................................................. 4-2
Digital Input Triggering Signals....................................................................... 4-2
Digital Input Timing Signals ............................................................................ 4-2
Digital Input Filters .......................................................................................... 4-6
Getting Started with DI Applications in Software............................................ 4-7
Change Detection Event ........................................................................................... 4-7
Routing Change Detection Event to an Output Terminal................................. 4-7
Change Detection Acquisition.......................................................................... 4-7
Digital Output ........................................................................................................... 4-8
Digital Output Data Generation Methods......................................................... 4-8
Digital Output Triggering Signals .................................................................... 4-10
Digital Output Timing Signals ......................................................................... 4-10
Getting Started with DO Applications in Software .......................................... 4-13
Digital Input/Output Configuration for NI 9401 ...................................................... 4-13
PFI .................................................................................................................................... 4-13
PFI Filters ................................................................................................................. 4-13
Chapter 5
Counters
Counter Timing Engine .................................................................................................... 5-2
Counter Input Applications .............................................................................................. 5-3
Counting Edges......................................................................................................... 5-3
Single Point (On-Demand) Edge Counting ...................................................... 5-3
Buffered (Sample Clock) Edge Counting......................................................... 5-4
Controlling the Direction of Counting.............................................................. 5-5
Pulse-Width Measurement ....................................................................................... 5-5
Single Pulse-Width Measurement .................................................................... 5-5
Implicit Buffered Pulse-Width Measurement................................................... 5-6
Sample Clocked Buffered Pulse-Width Measurement ..................................... 5-6
Pulse Measurement................................................................................................... 5-7
Single Pulse Measurement................................................................................ 5-8
Implicit Buffered Pulse Measurement.............................................................. 5-8
Sample Clocked Buffered Pulse Measurement ................................................ 5-8
Semi-Period Measurement ....................................................................................... 5-9
Single Semi-Period Measurement .................................................................... 5-9
Implicit Buffered Semi-Period Measurement................................................... 5-10
Pulse versus Semi-Period Measurements ......................................................... 5-10
- -918x/919x 1
- Legal Information 3
- Export Compliance Information 4
- Contents 5
- Chapter 3 6
- Chapter 4 7
- Chapter 5 7
- Counters 7
- © National Instruments 9
- Getting Started with the 10
- NI cDAQ-9184 Chassis 11
- NI cDAQ-9188 Chassis 11
- Safety Guidelines 12
- 1-4 13
- Hardware Symbol Definitions 14
- Unpacking 14
- Installing the cDAQ Chassis 14
- 1-6 15
- © National Instruments 16
- 1-8 17
- <network> 18
- 1-10 19
- MAX Icons and States 20
- 1-12 21
- Reserving the Chassis in MAX 23
- QoS Priority 23
- Mounting the cDAQ Chassis 24
- NI 9901 Desktop Mounting Kit 25
- NI cDAQ-9181/9191 26
- 1-18 27
- © National Instruments 28
- NI cDAQ-9184/9188 29
- © National Instruments 30
- NI cDAQ-9184 31
- NI CompactDAQ 31
- NI cDAQ Chassis Features 34
- LED State/Chassis Status 35
- © National Instruments 36
- Ethernet Cabling 37
- Reset Button 38
- Power Connector 38
- PFI BNC Connectors 38
- Cables and Accessories 39
- Using the cDAQ Chassis 40
- 1-32 41
- © National Instruments 42
- Analog Input 43
- AI Sample Clock Signal 44
- Scanned Modules 45
- Sigma-Delta Modules 45
- AI Start Trigger Signal 46
- AI Reference Trigger Signal 47
- AI Pause Trigger Signal 48
- Using an Analog Source 49
- Analog Output 50
- Hardware-Timed Generations 51
- Analog Output Timing Signals 52
- AO Start Trigger Signal 53
- AO Pause Trigger Signal 54
- for more 55
- Digital Input/Output and PFI 56
- Static DIO 57
- Digital Input 57
- Using an Internal Source 58
- Using a Digital Source 59
- Using an External Source 59
- Change Detection Event 62
- Digital Output 63
- Buffered Digital Output 64
- Digital Output Timing Signals 65
- PFI Filters 68
- PFI Filter Example 69
- Counter Timing Engine 71
- Counter Input Applications 72
- 10763 452 73
- Pulse-Width Measurement 74
- Latched Value 75
- Pulse Measurement 76
- Single Pulse Measurement 77
- Semi-Period Measurement 78
- Frequency Measurement 79
- © National Instruments 80
- 5-12 81
- Chapter 5 Counters 81
- © National Instruments 82
- 5-14 83
- Frequency Measurement Methods 84
- Which Method Is Best? 85
- © National Instruments 86
- Period Measurement 87
- Position Measurement 88
- Channel Z Behavior 89
- Buffered Position Measurement 90
- 000123 4567880 8 91
- © National Instruments 92
- Counter Output Applications 93
- Pulse Train Generation 94
- 4 3 210210 43 210210 95
- 5-28 97
- Counter Armed 98
- Frequency Generation 99
- Frequency Division 100
- Counter Timing Signals 101
- Counter n Source Signal 102
- Counter n Gate Signal 103
- Counter n Aux Signal 104
- Counter n Sample Clock Signal 105
- Counter n Up_Down Signal 105
- Counter n HW Arm Signal 105
- Frequency Output Signal 106
- Default Counter/Timer Routing 107
- Counter Triggering 107
- Other Counter Features 108
- 80 MHz Source Mode 109
- Digital Routing and Clock 110
- Generation 110
- 80 MHz Timebase 111
- 20 MHz Timebase 111
- 100 kHz Timebase 111
- NI cDAQ-9191 Regulatory 112
- Information 112
- A-2 113
- EU Regulatory Statements 114
- Singapore 115
- *0107898581340997* 116
- Where to Go from Here 117
- NI-DAQmx 118
- LabWindows/CVI 118
- Measurement Studio 119
- Training Courses 120
- Technical Support on the Web 120
- Technical Support and 121
- Professional Services 121
- C-2 122
- Numerics 123
- I-2 124
- NI cDAQ-918x/919x User Manual 125
- © National Instruments 125
- I-4 126
- © National Instruments 127
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