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Chapter A Appendices
MS-3 Laser Scanner User’s Manual A-19
A–Appendices
Appendix J — Formulas for Number of Decodes
To ensure reliable scanning, apply a minimum of five decodes to each symbol. Use the
formulas below to calculate the number of decodes that your symbol will receive.
If the number of decodes you derive from one of these calculations is less than the
minimum for your application, plug in the minimum number of decodes (5) and solve
for another parameter that might be changed, such as symbol speed or scans per sec-
ond.
Note: While the formulas given here solve for the predicted number of decodes, you
may also use the formulas to solve for other parameters that might be changed, such
as symbol speed, symbol length, etc.
Single Line Ladder Calculation
For single scan line ladder scanning, use the following for-
mula:
1
SH (Symbol Height) (ladder formula only) is a measurement of
the height of individual bars.
SS (Symbol Speed) is the distance per second that a symbol
moves through the scan.
DR (Decode Rate) is the number of decodes per second that
a given symbol receives (as derived from a stationary scan test in “Test Decode
Rate” on page A-43).
Single Scan Line Picket Fence Calculation
For single scan line picket fence scanning
use the following formula:
1. The -3 component in the formula is included to allow for AGC acquisition, an incomplete first
scan, and an incomplete last scan. This applies only if the number inside the parentheses equals
4 or more. If the number equals 3, then only subtract 2 to derive 1 good scan.
Direction of label travel
Scan Line
Figure A-2 Ladder
SH
SS
--------
DR×
3– ND (number of decodes)=
Scan line
Label
placement
area
Direction of label travel
Figure A-3 Picket Fence
SW SL–()
SS
---------------------------
DR×
3– number of complete decodes=
- MS-3 Laser Scanner 1
- Microscan Systems, Inc 2
- Microscan Europe 2
- Microscan Asia Pacific R.O 2
- Table of Contents 4
- Chapter 11 Utilities 6
- List of Figures 7
- List of Tables 7
- About the MS-3 Laser Scanner 9
- About This Manual 9
- Host Communications 9
- Highlighting 9
- Product Labels 10
- Warning and Caution Summary 11
- Quick Start 13
- Step 1 — Hardware Required 14
- Step 2 — Connect the System 15
- 1–Quick Start 16
- Quick Start 17
- Step 5 — Start Calibration 18
- Step 6 — Test for Read Rate 19
- Step 7 — Save Settings 20
- Communications 21
- 2–Communications 22
- Communications 23
- Host Port Parameters 24
- RS422 Status 25
- Auxiliary Port 26
- Transparent Mode 27
- Half Duplex Mode 28
- Full Duplex Mode 29
- Daisy Chain Mode 30
- Command Processing Mode 32
- Daisy Chain ID Status 34
- Daisy Chain ID 34
- Protocol 35
- Protocol By Serial Command 36
- Protocol by Embedded Menu 37
- Point-to-Point with RTS/CTS 39
- Polling Mode D 40
- Multidrop 40
- User Defined Point-to-Point 40
- Protocol 41
- User Defined Multidrop 42
- Response Timeout 44
- Intercharacter Delay 45
- Preamble Characters 46
- Postamble Characters 47
- 3–Protocol 48
- Read Cycle/Trigger 49
- Read Cycle by Serial Command 50
- Read Cycle by Embedded Menu 51
- Trigger Mode 52
- Continuous Read 1 Output 53
- External Trigger Level 54
- External Trigger Edge 55
- Serial Data 56
- Serial Data or External Edge 56
- Trigger Filter Duration 57
- External Trigger State 58
- Serial Trigger Character 59
- 4–Read Cycle/Trig 60
- Read Cycle/Trigger 61
- Good Decode Reads 62
- Read Cycle 63
- New Trigger 64
- Timeout or New Trigger 64
- Timeout Duration 65
- Multisymbol 66
- Multisymbol Separator 67
- Symbology 69
- Symbology by Embedded Menu 70
- Symbology by Serial Command 71
- Autodiscriminate 72
- Narrow Margins 73
- Symbology ID 74
- Background Color 75
- Code 39 Status 76
- Check Digit Status (Code 39) 76
- Check Digit Output (Code 39) 76
- Symbology 77
- Full ASCII Set (Code 39) 78
- Fixed Symbol Length (Codabar) 80
- Interleaved 2 of 5 82
- 5–Symbology 84
- Separator Status (UPC/EAN) 86
- Code 128 88
- UCC/EAN-128 89
- Code 93 Status 92
- Fixed Code Length (Code 93) 92
- Pharmacode 93
- Bar Widths (Pharmacode) 94
- Matchcode 95
- Matchcode by Serial Command 96
- Matchcode by Embedded Menu 97
- Overview of Matchcode 98
- Using Master Symbols 99
- Matchcode Type 100
- Match Start Position 101
- Match Length 101
- Wild Card Character 102
- Sequence On Noread 103
- Sequence On Mismatch 104
- Master Symbol Database 105
- Request Master Symbol Data 106
- Delete Master Symbol Data 107
- New Master Pin 108
- Scanner Setup 109
- 7–Scanner Setup 110
- Scanner Setup 111
- Scan Speed 112
- Laser On/Off Status 113
- Laser Framing 114
- Laser On Position 115
- Laser Off Position 116
- Laser Power 117
- Automatic Gain Control 118
- AGC Minimum 119
- AGC Maximum 119
- Transition Counter 120
- Bar Detection 121
- Data Outputs 123
- 8–Data Outputs 124
- Data Outputs 125
- Symbol Output 126
- When to Output Symbol Data 127
- As Soon As Possible 128
- End of Read Cycle 128
- Message Output 129
- Noread Message 130
- Bad Symbol Message 131
- No Symbol Message 132
- Serial Verification 133
- Control/Hex Output 134
- Operational Command Output 134
- Quality Output 135
- Partial Output 136
- Beeper Output 137
- Discrete I/O 139
- 9–Discrete I/O 140
- Discrete I/O 141
- Output 1 142
- Output Polarity 143
- Pulse Width 143
- Number to Output On 143
- Output 2 144
- Output 3 144
- Diagnostics 145
- Diagnostics by Serial Command 146
- Diagnostics by Embedded Menu 147
- Warning Messages Overview 148
- Warning Message Status 149
- Laser High Warning 150
- Laser Low Warning 151
- NOVRAM Corrupt Warning Status 152
- Power-on Count 153
- Time Since Last Reset 154
- Utilities 155
- Utilities by Serial Command 156
- Utilities 157
- Counters 158
- Part Number 159
- Checksum 160
- Read Rate 161
- Device Control 162
- Symbol Type 164
- Defaulting/Saving/Resetting 165
- Factory Default Parameters 166
- Default/Reset Definitions 166
- Code Types Enable Commands 167
- Scanner Status Requests 168
- Appendices 169
- A–Appendices 170
- Appendices 171
- Scanner Pin Assignments 172
- Caution: 172
- Serial Utility Commands 176
- Appendix F — ASCII Table 178
- Customer Default Parameters 180
- Hardware Default 182
- Reader Status Requests 183
- Entering Symbol Configuration 184
- Using Configuration Symbols 184
- Appendix I — Object Detector 186
- Appendix K — Operational Tips 189
- Appendix L — Embedded Menus 190
- Polling Sequence 194
- Select Sequence 195
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