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Chapter 13: Scanners
Scanner Events
Psion Mobile Devices Developers Guide
160
Figure 13.2 Software Initiated Scanner Timing Sequence
There are four possible outcomes for a bar code scan:
• The scan is successful.
•The scan times out.
• The scan is cancelled.
• The scan fails.
The scan is successful: The bar code is scanned and decoded before the scanner trigger is released. The
decoded bar code is displayed on the screen of the hand-held computer, as well as being returned as a char-
acter string to the calling program.
The scan times out: The scan beam on time expires and the scanner beam is turned off before the bar
code has been decoded. The scanner trigger must be released before another scan can be initiated. This
condition can be caused by the following:
• Scanning an unsupported bar code symbology.
• Scanning a disabled bar code symbology.
• Scanning a damaged or otherwise unreadable (out of specification) bar code.
• Scanning something that is not a bar code.
The scan is cancelled: The scanner trigger is released before the bar code has been decoded.
The scan fails: No bar code data is generated by the scan. The cause is not known.
13.8 Scanner Events
The following types of scan events are generated (check the API library documentation for the name of the
event and the values returned in each of the development languages):
Typically 0.5 sec.
Time
Scan initiated
Dot time
Scan beam on time
Soft Scan Timeout
Time
Typically 0.5 sec.
Time
Scan initiated
Dot time
Scan beam on time
Soft Scan Timeout
Time
Event Type Generated When... Returns
Scan complete Scan is successful
Scan failed Scan is not successful Scan cancelled
Scan timed-out
Scan failed
- MOBILE DEVICES 1
- TA B L E O F 5
- CONTENTS 5
- Chapter 4: Reset 6
- Chapter 5: Display 6
- Chapter 6: Indicators 6
- Chapter 8: Peripherals 6
- Chapter 9: Card Slots 7
- Chapter 10: Serial Ports 7
- Chapter 13: Scanners 7
- Chapter 14: Audio 8
- Chapter 16: Windows Shell 9
- Chapter 17: Trigger Control 9
- Table of Contents 10
- Chapter 21: GPS 11
- Chapter 22: Sensors 11
- Chapter 23: Other Features 12
- Appendices 12
- Appendix A: Resources 12
- Appendix B: Registry Keys 12
- INTRODUCTION 13
- 1.1 About This Manual 14
- 1.2 Text Conventions 15
- 1.3 Non-Psion Computers 15
- Chapter 1: Introduction 16
- BACKLIGHT 17
- 2.1 Backlighting 19
- 2.5 Backlight API Elements 25
- BATTERIES AND POWER 27
- MANAGEMENT 27
- 3.1 Suspend Timeout 29
- 3.2 Psion Power States 30
- 3.2.7 Power Off 31
- 3.6.1 Initiation of Suspend 34
- 3.9 Suspend API Elements 35
- 3.10 Power Management 35
- 3.11 Battery Information 36
- 3.11.3 Smart Batteries 37
- 4.1 Reset Types and Effects 41
- Chapter 4: Reset 42
- Reset Types and Effects 42
- 4.5 Code Samples for Resets 47
- 4.6 Reset API Elements 47
- DISPLAY 5 49
- 5.1 Display 51
- 5.4 Display API Elements 53
- INDICATORS 55
- 6.1 Indicators 57
- 6.2 Using LED Colours 57
- 6.3 Controlling Pulses 58
- 6.7 Indicator API Elements 58
- KEYBOARD AND 59
- KEYBOARD REMAPPING 59
- 7.1 Key b o a rd 61
- 7.1.2 Disabling The Keyboard 62
- 7.2 Keyboard Remapping 63
- 7.2.1 ORANGE Key and SYM Key 64
- Function Description 65
- 7.3 Key Insertion 71
- Key Insertion API Elements 72
- PERIPHERALS 73
- 8.1 Overview 75
- 8.2 Definition of Terms 75
- 8.3 Events 75
- 8.4 Docking Station 75
- 8.5 Tether Ports 76
- Chapter 8: Peripherals 77
- CARD SLOTS 79
- 9.1 Card Slots 81
- Chapter 9: Card Slots 84
- SERIAL PORTS 85
- 10.1 Overview 87
- Port Assignments 89
- 10.9 Java 90
- Chapter 10: Serial Ports 91
- Serial Port API Elements 91
- PERMANENT STORAGE 93
- 11.1 Permanent Storage 95
- RAS (REMOTE ACCESS 97
- SERVICE) 97
- 12.1 Overview 99
- 12.3 RAS Architecture 100
- 12.5 Getting Started with RAS 100
- 12.6 Code Samples for RAS 100
- 12.7 RAS API Elements 101
- SCANNERS 103
- 13.1 Types Of Scanners 105
- 13.2 External Scanners 105
- Chapter 13: Scanners 106
- 13.3 Internal Scanners 107
- 13.4 Symbologies 109
- 13.5 Configuring Scanners 110
- Decoded Laser Scanner Options 116
- Scanner setting key = Decoded 116
- 13.6.2 Code 39 Settings 120
- 13.6.3 Trioptic Code Settings 122
- 13.6.4 Code 128 Settings 123
- 13.6.5 EAN 13 Settings 125
- 13.6.6 EAN 8 Settings 127
- 13.6.7 UPC A Settings 129
- 13.6.8 UPC E Settings 131
- 13.6.10 Codabar Settings 135
- 13.6.11 Code 93 Settings 137
- 13.6.12 Code 11 Settings 139
- 13.6.14 MSI Plessey Settings 143
- 13.6.17 IATA 2 of 5 Settings 147
- 13.6.18 Telepen Settings 148
- 13.6.20 PosiCode Settings 152
- 13.6.21 Composite Codes 152
- 13.6.22 TLC-39 Settings 154
- 13.6.23 PDF417 Settings 155
- 13.6.25 Code 16K Settings 157
- 13.6.26 Code 49 Settings 158
- 13.6.27 Codablock Settings 158
- 13.6.29 2D QR Code Settings 160
- 13.6.30 2D MaxiCode Settings 161
- 13.6.31 2D Aztec Settings 162
- 13.6.37 Postal - Kix Settings 167
- 13.7 Reading Bar Codes 171
- 13.8 Scanner Events 172
- AUDIO 14 173
- 14.1 Sound Hardware 175
- 14.6 Sound API Elements 176
- 14.7 Microphone 177
- 14.8 Audio Input 177
- 14.9 Audio Input API Elements 178
- SYSTEM INFORMATION 179
- 15.1 System Information 181
- 15.2 Machine Type 181
- 15.3 Model 181
- 15.5 Psion Build Codes 181
- 15.6 Psion Version Numbers 182
- WINDOWS SHELL 185
- 16.1 Windows Shell 187
- 16.2 Setting Windows Security 187
- TRIGGER CONTROL 189
- 17.1 Overview 191
- 17.2 Definition Of Terms 191
- 17.4 Trigger Source IDs 191
- 17.5 Trigger Associations 192
- 17.6 Double-Clicks 192
- 17.7 Events 193
- WIRELESS LOCAL-AREA 195
- NETWORKING 195
- 18.2 Supplicants 197
- 18.2.1 Namespaces 198
- 18.3 Configuring WLAN Radios 199
- 18.4 Authentication Modes 199
- 18.6.2 Encryption Modes 201
- 18.8 Summit Radio Features 202
- 18.11 Ad hoc Networks 203
- 18.12 Getting Started 203
- 18.13 Code Samples 203
- 18.14 WLAN API Elements 204
- WIRELESS WIDE-AREA 205
- 19.4 Supported WWAN Modems 208
- 19.4.2.2 Configuration 209
- 19.4.2.3 AT Commands 209
- 19.4.4 Packet Data 211
- 19.4.6 GSM Power Driver 211
- 19.5 Initializing WWAN 212
- WWAN Driver Status Flags 213
- Initializing the WWAN Driver 215
- 19.6 Closing WWAN 217
- Connecting to the Internet 218
- 19.7.3 The DbGprs.csv File 221
- 19.7.5 Roaming 222
- 19.8 Access Flags 223
- 19.10 WWAN API Elements 225
- 19.11.1 SMS API Elements 226
- 19.13 Voice Calls on a WWAN 227
- 19.13.1 Initializing WWAN 228
- Initializing Voice Over WWAN 229
- 19.13.4 Making a Phone Call 230
- 19.13.5 Voice Call States 231
- Voice Call States 232
- Receiving a Phone Call 233
- Processing Voice Calls 234
- Terminating Voice Calls 235
- 19.13.9 Call Forwarding 236
- Audio for Voice Over WWAN 237
- 19.14 Phone Books 238
- 19.14.2 Phone Book Types 239
- 19.15 Resource Materials 240
- REGISTRY-BASED WWAN 241
- 20.1 Overview 243
- 20.2.3 Network Status 245
- 20.2.4 Packet Data Status 245
- 20.2.5 Voice Call Status 246
- 20.5 Sample Source Code 248
- Sample Source Code 249
- 21.1.1 Built-in GPS 255
- 21.1.2 End-cap GPS 255
- 21.1.3 External GPS 255
- 21.3 GPS Configuration 256
- 21.4 Processing GPS Data 256
- 21.5 Getting Started with GPS 256
- 21.6 Code Samples for GPS 256
- 21.7 GPS API Elements 256
- SENSORS 22 257
- 22.1 Introduction 259
- 22.2 Accelerometer 259
- 22.3 Gyroscope 259
- ±9 milli-degrees per second 260
- ±4 gauss 260
- 22.5 Light Sensor 261
- 22.6 Proximity Sensor 261
- Chapter 22: Sensors 262
- OTHER FEATURES 263
- 23.1 Vibration 265
- 23.3 PsionVU 266
- APPENDIX: RESOURCES 267
- Manuals and URLs 268
- APPENDIX: REGISTRY 271
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