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38 Signal Connections
PCI-9524 ADLINK Technology Inc.
User’s Manual Copyright 2008
3.3 Isolated Digital Signal Connection
PCI-9524 provides three opto-isolated encoder input channels,
three opto-isolated pulse-command outputs, eight channel opto-
isolated digital inputs as well as eight channel isolated digital out-
puts. Also, a built-in isolated power supply can be used as a resis-
tors pull-up source.
3.3.1 Signal Sources and Terminal Devices
Open-collector and open-drain outputs
Open-collector or open-drain output stages are commonly used in
industrial I/O. Open-collector/open-drain output stages made of
NPN or N-MOS type transistors are for sink-type drivers, while
those made of PNP or P-MOS type are for source-type drivers. A
sink-driver sinks current from the external pull-up resistor when it
is activated, and floats when it is inactivated; conversely, a source-
driver sources current to the external pull-down resistor when it is
activated, and floats when it is inactivated. High-side voltage can
usually go as high as the output transistor can tolerate, and hence
offers a wider, more versatile output voltage selection. The draw-
back is that when the output stage is inactivated, either the signal
fall-time of a source-driver or the rise-time of a sink-driver, is deter-
mined by the RC time-constant formed by the pull-up/pull-down
resistor and the stray capacitance. The asymmetrical rise/fall-time
somehow limits the frequency response of the output stage.
Push-pull outputs
Push-pull output stages are comprised of a complementary tran-
sistor pair, say, a PNP plus a PNP, or a P-MOS plus an N-MOS.
Unlike open-collector output stages, they can sink or source cur-
rent and hence a symmetrical rise/fall-time that is independent of
the external load resistance. Push-pull output stages can generally
toggle at a much faster speed than open-collector output stages.
- PCI-9524 1
- Revision History 2
- Disclaimer 3
- Environmental Responsibility 3
- Trademarks 3
- Using this Manual 5
- Conventions 6
- Getting Service 7
- Table of Contents 9
- User’s Manual Copyright 2008 10
- Table of Contents xi 11
- Copyright 2008 User’s Manual 11
- List of Figures 13
- List of Tables 15
- 1 Introduction 17
- 1.1 Features 18
- 1.2 Applications 18
- 1.3 Specifications 19
- Introduction 9 25
- Magnitude (dB) 27
- 12 Introduction 28
- Introduction 15 31
- 16 Introduction 32
- Ω 32
- Introduction 17 33
- Ω 33
- 18 Introduction 34
- 1.4 Software Support 35
- 20 Introduction 36
- 2 Getting Started 37
- 2.2 Package Contents 38
- 2.3 PCI-9524 Layout 39
- 2.4 Installing the Card 40
- 2.5 PCI Configuration 41
- 26 Getting Started 42
- 3 Signal Connections 43
- 28 Signal Connections 44
- Signal Connections 29 45
- 30 Signal Connections 46
- Signal Connections 31 47
- 3.2.1 Signal Sources 49
- 3.2.2 Input Configurations 49
- 34 Signal Connections 50
- Signal Connections 35 51
- Load-cell Transducer 52
- Signal Connections 37 53
- 38 Signal Connections 54
- Encoder PCI-9524 56
- PCI-9524 Encoder 56
- Servo AmplifierPCI-9524 58
- Signal Connections 43 59
- 44 Signal Connections 60
- 46 Signal Connections 62
- 4 Operation Theory 63
- 4.2 Analog Input Channels 64
- 50 Operation Theory 66
- Operation Theory 51 67
- 52 Operation Theory 68
- 54 Operation Theory 70
- Operation Theory 55 71
- 56 Operation Theory 72
- Operation Theory 57 73
- 4.2.8 Warm-up Requirement 74
- Operation Theory 59 75
- 60 Operation Theory 76
- 4.2.10 RAW Data Format 77
- 4.2.11 AD Data Format 78
- 4.2.12 Data Transfer Modes 80
- Operation Theory 65 81
- 4.2.13 Trigger Modes 82
- Operation Theory 67 83
- 68 Operation Theory 84
- Figure 4-8: X4 Encoder mode 84
- 4.6 Isolated Digital I/O 85
- 4.7 Trigger Sources 86
- Operation Theory 71 87
- 72 Operation Theory 88
- 5 Calibration 89
- 5.2 Auto-calibration 90
- Important Safety Instructions 91
- CAUTION: 92
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