Computer Interfacing (eBook)

Graham Dixey (Autor)

eBook Download: PDF

2014 | 1. Auflage
208 Seiten
Elsevier Science (Verlag)
978-1-4832-9460-5 (ISBN)

Infos

This book explains how computers interact with the world around them and therefore how to make them a useful tool. Topics covered include descriptions of all the components that make up a computer, principles of data exchange, interaction with peripherals, serial communication, input devices, recording methods, computer-controlled motors, and printers. In an informative and straightforward manner, Graham Dixey describes how to turn what might seem an incomprehensible 'black box' PC into a powerful and enjoyable tool that can help you in all areas of your work and leisure. With plenty of handy tips and clear illustrations this book can improve your computer system, and even shows new uses for old kit such as motor control.

Inhalt

Front Cover 1
Computer Interfacing 4
Copyright Page 5
Table of Contents 6
Preface 8
Chapter 1. Introduction 10
Processors 11
Interfaces and buses 13
Signal conversion 14
A question of speed 17
Core task 19
Chapter 2. Transducers 22
Encoder circuits 25
Transducers 27
Transducers for temperature measurement and control 28
Transducers for force and displacement 31
Optical transducers 33
Potentiometric transducers 37
The digital shaft encoder 39
Chapter 3. Conversion between digital and analogue 42
Sampling the input 43
Quantisation 44
Full scale range, quantisation levels and resolution 46
Sample-and-hold circuits 47
Signal conditioning 48
Multiplexed inputs 50
The converter-computer linkup 50
Digital-to-analogue converters 52
Analogue-to-digital converters 54
The continuous balance ADC 54
The dual-slope ADC 56
The successive approximation register ADC 58
A practical ADC/ DAC circuit 60
Parts list for ZN425E switched ADC/DAC 63
Chapter 4. Interrupts 64
Software polling 65
Prioritisation of interrupts 71
Masking 71
Daisy chaining of peripherals 74
Priority interrupt controllers (PICs) 77
Direct memory access (DMA) 79
Handshaking 82
Chapter 5. Serial versus parallel 86
The nature of serial data 87
Baud rates 87
Parity 88
Data transfer modes: simplex, full-duplex and half-duplex 91
Parallel-serial conversion 92
The 6402 UART 93
The Motorola 6850 ACIA 97
The 8251 USART 99
The SIO (serial input/output device) 101
The El A 232 standard serial interface 101
Data codes 102
Modems 103
Chapter 6. The computer keyboard and VDU 106
Keyboard problems — rollover and lockout 107
The keyboard matrix 108
Non-encoded and encoded keyboards 108
ASCII code 111
A standard keyboard encoder 116
Other forms of input device 117
The mouse 120
The trackerball 121
The light pen 122
The writing or graphics tablet 123
The VDU (visual display unit) 125
A memory-mapped VDU 127
Chapter 7. Magnetic recording principles and methods 132
Recording codes 133
Floppy disks and floppy disk systems 135
Files and directories 139
The floppy disk drive unit 140
The disk drive interface 142
Basic functions of a floppy disk controller 145
Operation of the floppy disk controller 146
Hard disk systems 147
Chapter 8. Motor drives 150
Closed and open loop systems 158
Stepper motors 160
Advantages of stepper motor systems 161
Stepper motor principles 162
Stepper motor drives 164
Available stepper motor ICs 168
Chapter 9. Printers 170
Cylinder head printers 173
Dot-matrix printers 174
Daisy-wheel printers 181
Laser printers 183
Inkjet printers 187
Thermal printers 190
Printer interfaces 190
Index 192

Produkt-Details

• Erscheint lt. Verlag: 28.6.2014
• Sprache: englisch
• Themenwelt: Mathematik / Informatik ► Informatik ► Netzwerke
• Themenwelt: Informatik ► Software Entwicklung ► User Interfaces (HCI)
• ISBN-10: 1-4832-9460-9 / 1483294609
• ISBN-13: 978-1-4832-9460-5 / 9781483294605