Rockwell Automation 2755-G3-W, 2755-G6-W User Manual
ALLEN-BRADLEY
Bulletin 2755
Hand-Held Scanner
with Wedge Option
(Catalog No. 2755-G3-W, 2755-G6-W)
User Manual
Important User Information
Solid state equipment has operational characteristics
differing from those of electromechanical equipment.
“Application Guidelines for Application, Installation, and
Maintenance of Solid State Controls” (Publication
SGI-1.1) describes some important differences between
solid state equipment and hard–wired electromechanical
devices. Because of this difference, and also because of the
wide variety of uses for solid state equipment, all persons
responsible for applying this equipment must satisfy
themselves that each intended application of this
equipment is acceptable.
In no event will the Allen-Bradley Company be
responsible or liable for indirect or consequential damages
resulting from the use or application of this equipment.
The examples and diagrams in this manual are included
solely for illustrative purposes. Because of the many
variables and requirements associated with any particular
installation, the Allen-Bradley Company cannot assume
responsibility or liability for actual use based on the
examples and diagrams.
No patent liability is assumed by Allen-Bradley Company
with respect to use of information, circuits, equipment, or
software described in this manual.
Reproduction of the contents of this manual, in whole or in
part, without written permission of the Allen-Bradley
Company is prohibited.
Compaq is a registered trademark of Compaq Computer Corporation.
DEC and VT are registered trademarks of Digital Equipment Corporation.
Hewlett-Packard is a registered trademark of Hewlett-Packard Company.
IBM is a registered trademark of Internationa Business Machines Corporation
PC AT, PS/2 and PC XT are trademarks of International Business Machines Corporation
PHOTOSWITCH is a registered trademark of Allen-Bradley Company, Inc.
Table of Contents
Hand-Held Scanner with Wedge Option
A–B
Using
this Manual
Overview
of Scanner
Chapter 1
Chapter Objectives 1–1. . . . . . . . . . . . . . . . . . . . . . . . . .
Contents of Package 1–1. . . . . . . . . . . . . . . . . . . . . . . . .
Intended Audience 1–1. . . . . . . . . . . . . . . . . . . . . . . . . . .
Overview of Manual 1–2. . . . . . . . . . . . . . . . . . . . . . . . .
Warning and Caution Symbols 1–3. . . . . . . . . . . . . . . .
Related Publications 1–3. . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 2
Chapter Objectives 2–1. . . . . . . . . . . . . . . . . . . . . . . . . .
Function of Scanner 2–1. . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Modes 2–2. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hand-Held Mode 2–2. . . . . . . . . . . . . . . . . . . . . . . . .
Autosense Mode 2–2. . . . . . . . . . . . . . . . . . . . . . . . .
Setup Parameters 2–3. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Keyboard Wedge 2–3. . . . . . . . . . . . . . . . . . . . . . . . .
General Setup 2–3. . . . . . . . . . . . . . . . . . . . . . . . . . .
Message Format 2–4. . . . . . . . . . . . . . . . . . . . . . . . . .
Symbology 2–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ordering a Scanner 2–5. . . . . . . . . . . . . . . . . . . . . . . . . .
Scanner Accessories 2–6. . . . . . . . . . . . . . . . . . . . . . . . .
Using
the Scanner
Chapter 3
Chapter Objectives 3–1. . . . . . . . . . . . . . . . . . . . . . . . . .
Physical Description 3–1. . . . . . . . . . . . . . . . . . . . . . . . .
LED Indicators 3–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Safety Labels 3–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Scanning Ranges 3–4. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Scanner 3–6. . . . . . . . . . . . . . . . . . . . . . . . . . .
Beep 3–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Tips 3–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting 3–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
i
Table of Contents
Hand-Held Scanner with Wedge Option
Setup
Instructions
General
Setup
Parameters
Chapter 4
Chapter Objectives 4–1. . . . . . . . . . . . . . . . . . . . . . . . . .
Installing Wedge Interface 4–1. . . . . . . . . . . . . . . . . . . .
Connecting Scanner Interface Cable 4–2. . . . . . . .
Removing Scanner Interface Cable 4–3. . . . . . . . .
Connecting Wedge Interface Cable 4–4. . . . . . . . .
Connecting Optional Power Supply 4–5. . . . . . . . .
Terminal Power Up Sequence 4–5. . . . . . . . . . . . . .
Enabling Wedge Mode 4–6. . . . . . . . . . . . . . . . . . . . .
Selecting a T erminal Type 4–6. . . . . . . . . . . . . . . . . . .
Scanner Configuration Guidelines 4–8
Scanner Default Settings 4–10. . . . . . . . . . . . . . . . . . . . .
Resetting Factory Defaults 4–12. . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . .
Chapter 5
Chapter Objectives 5–1. . . . . . . . . . . . . . . . . . . . . . . . . .
System Status 5–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Consumption 5–3. . . . . . . . . . . . . . . . . . . . . . . . .
Beeper Operation 5–4. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Capture Count 5–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Spotter Beam 5–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Autosense Mode 5–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Message
Format
Parameters
ii
Chapter 6
Chapter Objectives 6–1. . . . . . . . . . . . . . . . . . . . . . . . . .
Message Format 6–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Prefix 6–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Suffix 6–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Scanner Identifier 6–4. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Code Identifier 6–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preamble or Postamble 6–6. . . . . . . . . . . . . . . . . . . . . . .
Preamble 6–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Postamble 6–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Intercharacter Delay 6–10. . . . . . . . . . . . . . . . . . . . . . . . .
Table of Contents
Hand-Held Scanner with Wedge Option
Symbologies
Chapter 7
Chapter Objectives 7–1. . . . . . . . . . . . . . . . . . . . . . . . . .
Label Lengths 7–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Code 39 7–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Modulo 43 Check Character 7–3. . . . . . . . . . . . . . .
Transmit Stop/Start Characters 7–3. . . . . . . . . . . . .
Minimum Length 7–4. . . . . . . . . . . . . . . . . . . . . . . . .
Maximum Length 7–4. . . . . . . . . . . . . . . . . . . . . . . .
UPC (A and E) 7–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Supplements 7–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Expanded UPC-E 7–5. . . . . . . . . . . . . . . . . . . . . . . .
Transmit Number System Digit 7–6. . . . . . . . . . . .
Transmit Check Digit 7–6. . . . . . . . . . . . . . . . . . . . .
UPC to EAN Translation 7–7. . . . . . . . . . . . . . . . . .
EAN/JAN 7–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Supplements 7–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transmit Number System Digit 7–9. . . . . . . . . . . .
Transmit Check Digit 7–9. . . . . . . . . . . . . . . . . . . . .
Interleaved 2 of 5 7–10. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Check Digit 7–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Minimum Length 7–11. . . . . . . . . . . . . . . . . . . . . . . . .
Maximum Length 7–11. . . . . . . . . . . . . . . . . . . . . . . .
Standard 2 of 5 7–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Minimum Length 7–12. . . . . . . . . . . . . . . . . . . . . . . . .
Maximum Length 7–12. . . . . . . . . . . . . . . . . . . . . . . .
Code 128 7–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Minimum Length 7–13. . . . . . . . . . . . . . . . . . . . . . . . .
Maximum Length 7–13. . . . . . . . . . . . . . . . . . . . . . . .
Codabar 7–14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transmit Stop/Start Characters 7–14. . . . . . . . . . . . .
Minimum Length 7–15. . . . . . . . . . . . . . . . . . . . . . . . .
Maximum Length 7–15. . . . . . . . . . . . . . . . . . . . . . . .
iii
Table of Contents
Hand-Held Scanner with Wedge Option
Specifications
Chapter 8
Appendix A Bar Code Test Symbols
Appendix B Digit Selection Symbols
Appendix C Autosense Mode
Appendix D Maintenance
Appendix E Scanner Parameters
Glossary
Index
iv
3.1
4.1
4.2
4.3
C.1
2.A
2.B
3.A
3.B
4.A
6.A
6.B
Table of Contents
Hand-Held Scanner with Wedge Option
Figures
Scanning Ranges 3–5. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Keyboard W edge Interface Connections 4–1. . . . . . . .
Connecting Scanner Interface Cable 4–2. . . . . . . . . . . .
Removing Scanner Interface Cable 4–3. . . . . . . . . . . . .
Autosense Mode C–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tables
Wedge Interface Cables 2–6. . . . . . . . . . . . . . . . . . . . . .
Scanner Accessories 2–6. . . . . . . . . . . . . . . . . . . . . . . . .
LED Indicators 3–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Scanning Ranges: Standard/Long Range Scanner 3–4
Scanner Default Settings 4–10
Code Identifier Characters 6–5. . . . . . . . . . . . . . . . . . . .
Hexadecimal Conversion Table 6–8. . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . .
v
Chapter
Using this Manual
1
A–B
Chapter Objectives
Contents of Package
Intended Audience
This chapter gives an overview of the manual
including:
• Contents of Package
• Intended Audience
• Overview of Manual
• Warnings and Cautions
• Related Publications
You should receive the following items when
ordering the Catalog No. 2755-G3-W or
2755-G6-W Scanner:
• Scanner
• Scanner Holder
• User Manual
No special knowledge is required to install,
configure, or operate the scanners as a keyboard
wedge interface. However, this manual does not tell
you how to use or generate an application program to
receive and store the data.
1–1
Chapter 1
Using this Manual
Overview of Manual
This manual shows how to set up and use the scanner
as a keyboard wedge interface for non-contact scan-
ning applications. The contents of each chapter are:
Chapter Title Purpose
1 Using this Manual Provides an overview of this manual.
2 Overview of Scanner Gives an overview of scanner functions, oper-
ating modes, and scanner setup parameters.
3 Using the Scanner Provides basic instructions on how to use the
scanner for non-contact scanning.
4 Setup Instructions Shows how to setup the scanner as a
keyboard wedge interface and configure the
operating parameters of the scanner.
5 General
Setup Parameters
6 Message
Format Parameters
7 Symbologies Covers parameters that enable bar code
8 Specifications Details specifications of the scanners.
Covers parameters specific to the operation of
the scanner including beeper, power consumption, and capture count. Parameters are
selected by scanning bar code labels.
Covers parameters that control the format of
messages transmitted to the host computer or
terminal. Parameters are selected by scanning
bar codes.
symbologies the scanner is capable of reading. Symbologies are disabled or enabled by
scanning bar codes.
1–2
Chapter 1
Using this Manual
Warning and Caution Symbols
Related Publications
This manual contains the following caution and
warning symbols.
CAUTION:
A laser caution symbol that appears
where laser light is present.
WARNING:
A warning symbol means people might
!
be injured if procedures are not followed.
CAUTION:
A caution symbol is used when equip-
!
ment may be damaged if procedures are
not followed.
Below is a list of related publications you may need
to refer to when using the scanners.
• Publication No. 2755-921
Bar Code Basics
Describes bar code symbologies, equipment, and
typical applications.
• Publication No. 2755-2.44
Product Data for the family of
Visible Laser Diode Hand-Held Scanners
1–3
Chapter
2
Overview of Scanner
A–B
Chapter Objectives
Function of Scanner
This chapter gives an overview of the scanner
including:
• Function of Scanner
• Operating Modes
• Scanner Setup Parameters
• Scanner Accessories
The scanner is a keyboard wedge interface that is
capable of scanning, decoding, and transmitting bar
code data to a host computer or terminal.
As a keyboard wedge interface you can use the
scanner with most manufacturer’s terminals. The
scanner connects between the keyboard and display
of the terminal. In this mode the scanner draws
power directly from the terminal.
The wedge translates scanned data so that it appears
as if it was entered at the keyboard. When the wedge
is transmitting scanned data, the computer ignores
data entered at the keyboard.
You configure the scanner for keyboard wedge mode
by modifying scanner setup parameters. Parameters
are selected based on the terminal type and the types
of bar codes used in your application.
The scanner is easily configured by scanning the
appropriate bar code labels in Chapters 4 through 7 of
this manual. When a configuration label is scanned,
the scanner sends a 1 or 2 line acknowledgement
message to your terminal display.
Important: It is your responsibility to provide the
appropriate application program on the host
computer/terminal to receive and store the data.
2–1
Chapter 2
Overview of Scanner
Operating Modes
The scanner functions in one of two operating modes:
Hand-Held Mode or Autosense Mode.
Hand-Held Mode
In hand-held mode, you hold the scanner in your
hand and press the trigger every time you want to
scan a bar code symbol.
Chapter 3 provides details on using the scanner in
hand-held mode.
Autosense Mode
In this mode the scanner operates in an optional
Autostand (Catalog No. 2755-NS2) for hands-free
operation. The scanner uses a low level laser beam as
an internal object sensor.
When the scanner is placed in the stand it becomes
immediately active for reading any bar code label
presented to it. The scanner is triggered when a bar
code label breaks the scan beam path (between the
reflector on the stand and the scanner).
You also have the option of removing the scanner
from the stand and using it as a conventional
hand-held scanner. The low level beam will not
interfere with hand-held use of the scanner.
2–2
When replaced in the stand the scanner reverts
automatically to the Autosense mode.
Note: Autosense mode can also be set up using a
PHOTOSWITCH reflector. See Accessories.
Chapter 2
Overview of Scanner
Setup Parameters
The built-in setup parameters of the scanner fall into
four general categories:
• Keyboard Wedge
• General Setup
• Message Format
• Symbologies
Each category controls parameters that relate to
specific functions of scanner operations and its
operation in wedge mode.
Keyboard Wedge Parameters
Parameters that configure the scanner to operate in
keyboard wedge mode include:
• Enable Wedge Mode
• Select T erminal Type
Chapter 4 shows how to enable the scanner to operate
in wedge mode with a specific terminal type.
General Setup Parameters
General setup parameters are basic to the operation
of the scanner. These parameters control:
• System Status Display
• Power Consumption
• Beeper Operation
• Capture Count
• Spotter Beam
• Autosense Mode
General parameters are set by scanning bar code
labels in Chapter 5.
2–3
Chapter 2
Overview of Scanner
Message Format Parameters
Parameters that control the format and speed of
messages transmitted to the host include:
• Prefix
• Suffix
• Scanner Identifier
• Code Identifier
• Preamble
• Postamble
• Intercharacter Delay
Message format parameters are enabled or disabled
by scanning bar codes in Chapter 6.
Symbology Parameters
The scanner can be configured to read the following
bar code symbologies:
2–4
• Code 39
• UPC
• EAN/JAN
• Interleaved 2 of 5
• Standard 2 of 5
• Code 128
• Codabar
Symbologies are selected based on the requirements
of the application.
You enable or disable symbologies by scanning bar
codes in Chapter 7.
Chapter 2
Overview of Scanner
Ordering a Scanner
The following figure shows the catalog number
breakdown for ordering a scanner.
2755 - G 3 - W
Bulletin Number
Device TypeDevice Type
G = Gun
Scan Range
3 = Standard Range
6 = Long Range
Decoder Type
W = Wedge
2–5
Chapter 2
Overview of Scanner
Scanner Accessories
Table 2.A lists the wedge interface cables available
for the supported terminal types. Included with each
catalog number is an 8 foot (2.4 meter) coiled
scanner interface cable.
Table 2.A
Wedge Interface Cables
Catalog No. T erminal Description
2755-NC20 IBM-PC, -XT, -AT
Allen-Bradley 6120, 6121
Alen-Bradley 1784-T35, -T50, -T60
Allen-Bradley 2706-DL40 (AT or XT Mode)
Compaq DeskPro, Compaq 286
2755-NC21 IBM PS/2 (50, 55, 60, 80)
Compaq 386
2755-NC22 IBM 3151, 3472
2755-NC24 DEC VT220, VT240, VT320, VT340,
VT420, VT1000
1
Requires Catalog No. 2755-PW1 Power Supply
Table 2.B lists other accessories for the scanners.
Table 2.B
Scanner Accessories
1
2–6
Catalog No. Description
2755-NS1 Scanner Holder (included with scanner).
2755-NS2
Autostand
2
2755-GB1 Holster Belt
2755-GH5 Scanner Holster (functions on belt or sling)
2755-PW1 5V Power Supply, 110 VAC, 60 Hz
2755-NT1 Reflective Tape, 2 inch (50.8 mm) square
3
92-39
92-47
2
Reflective tape is supplied with Autostand. Additional reflective
Circular Reflector, 3 inch (76.2 mm) diameter
3
Circular Reflector, 1 1/4 inch (31.8 mm) diameter
tape is available by ordering Catalog No. 2755-NT1.
3
Allen-Bradley PHOTOSWITCH part number.
Chapter
Using the Scanner
3
A–B
Chapter Objectives
Physical Description
This chapter covers some basic topics on the
operation and use of the scanner including:
• Physical Description
• LED Indicators
• Safety Labels
• Scanning Ranges
• Operating Scanner
• Beep
• Operating Tips
• Troubleshooting
The scanners use a low power visible laser diode light
source for non-contact scanning applications.
The trigger in the handle of the scanner turns on the
light beam. The beam exits the window on the front
of the scanner.
LED Indicators
Cable Connection
Note: If your scanner is enabled for Autosense
mode, the internal object sensor is automatically
triggered when bar codes are presented to it.
Scanning Window
Trigger
3–1
Chapter 3
Using the Scanner
Light, reflected off the bar code symbols, passes back
through the window and is detected by light sensors.
When a label is read, the laser is automatically turned
off until the next pull of the trigger.
The laser beam looks like a narrow red line of light. It
is actually a tiny spot of light traveling very fast. The
laser spot moves across the bar code symbol at
approximately 35 scans/second. The bar code is
scanned many times in a short period of time.
LED Indicators
The rear of the scanner has two indicators that
provide a visual indication of scanner operation.
GOOD READ
SCANNING
Table 3.A defines the color and function of each
LED indicator.
Table 3.A
LED Indicators
LED Label Color Function
The GOOD READ light momentarily turns on
GOOD READ Green
SCANNING Yellow The SCANNING light turns on when the
(and you will hear a beep) when a bar code
symbol has been successfully decoded.
device is scanning.
3–2
Chapter 3
Using the Scanner
Safety Labels
The scanners use a low power visible laser diode. As
with any bright light source, such as the sun, you
should avoid staring directly into the beam.
Momentary exposure to a CDRH Class II laser is not
known to be harmful.
The following figure shows the location of all safety
labels as they appear on the scanner.
CAUTION:
Use of controls, adjustments, or perform-
!
ance of procedures other than those
specified herein may result in hazardous
visible light exposure.
3–3
Chapter 3
Using the Scanner
Scanning Ranges
The scanners can read bar code labels at various
distances depending on the bar code width (width of
narrowest element in bar code, either bar or space).
T able 3.B defines the scanning ranges for both the
standard and long range scanner. Scanning ranges are
listed for symbols with bar code widths from 6.0 mil
to 55.0 mil (.15 mm to 1.40 mm).
Table 3.B
Scanning Ranges: Standard and Long Range Scanners
Bar Code
Width
6.0 mil
(.15 mm)
7.5 mil
(.19 mm)
10.0 mil
(.25 mm)
15.0 mil
(.38 mm)
20.0 mil
(.51 mm)
40.0 mil
(1.02 mm)
55.0 mil
(1.40 mm)
Standard Range
(2755-G3-W)
3.0 in - 5.0 in
7.6 cm - 12.7 cm
2.5 in - 7.5 in
6.4 cm - 19.0 cm
1.0 in - 10.0 in
2.5 cm - 25.4 cm
1.5 in - 14.0 in
3.8 cm - 35.6 cm
2.5 in - 18.0 in
6.4 cm - 45.7 cm
9.0 in - 25.0 in
22.9 cm - 63.5 cm
12.0 in - 30.0 in
30.5 cm - 76.2 cm
Long Range
(2755-G6-W)
N.A.
N.A.
N.A.
8.0 in - 22 in
20.3 cm - 55.9 cm
12 in - 36 in
30.5 cm - 91.4 cm
23 in - 60 in
58.4 cm - 152.4 cm
23 in - 66 in
58.4 cm - 167.6 cm
3–4
Figure 3.1 illustrates the scanning ranges in graphic
form. The figure shows that the scanning range of
the standard range scanner for a 40.0 mil (1.02 mm)
bar code width is 9.0 - 25.0 inches (22.9 - 63.5 cm).
The scanning range of the long range scanner for the
40.0 mil (1.02 mm) bar code width is 23 - 60 inches
(58.4 - 152.4 cm).
Standard Range Scanner
Catalog No. 2755-G3-W
Narrow
Bar Width
Scanner
0.006 in
(0.15mm)
0.0075 in
(0.19mm)
inches
centimeters
0
Figure 3.1
Scanning Ranges
0.010 in
(0.25mm)
0.015 in
(0.38mm)
0.020 in
(0.51mm)
10 20 30
5
25.4 50.8 76.2
12.7
Chapter 3
Using the Scanner
0.040 in
(1.02 mm)
(1.40 mm)
15
38.1
Depth of Field
0.055 in
63.5
10
5
Width
of
0
Scanning
Beam
(inches)
5
10
25
Long Range Scanner
Catalog No. 2755-G6-W
Scanner
Narrow
Bar Width
0
inches
centimeters
15.0 mil
(0.38 mm)
20.0 mil
(0.51mm)
40.0 mil
(1.02 mm)
55.0 mil
(1.40 mm)
25.4 50.8 76.2 101.6 127.0
2010
Depth of Field
10
5
Width
of
0
Scanning
Beam
(inches)
5
10
504030
60 70
152.4 177.8
3–5
Chapter 3
Using the Scanner
Operating
Follow these basic steps to operate scanner.
Scanner
1. Check
Before using the scanner, check
all cable connections to make
sure they are secure.
Chapter 4 defines the wedge
interface connections for
the scanner.
2. Test
Aim the scanner at the work
surface and press the trigger.
You should see the red beam on
the work surface, and the SCANNING indicator on the back of
the unit should be on.
2. Scan
Aim the scanner at the bar code and
press the trigger. Adjust the scanner
position so the beam is centered on the
bar code and overlaps it on both sides.
When the scanner has read the symbol:
• You will hear a beep and/or ...
• The GOOD READ light will
turn on momentarily.
• The red beam will turn off.
If you fail to scan, see the Trouble-
shooting section.
3–6
Chapter 3
Using the Scanner
Beep
Operating Tips
RIGHT
When scanning a bar code symbol, listen for one
short, high tone. It means the bar code has been
decoded successfully.
Hold at an Angle
Do not hold the scanner directly over the bar code. In
this position light can bounce back into the scanner
and prevent decoding. Angle the scanner slightly.
Scan the Entire Symbol
• Move the scanner so the beam crosses every bar
and space on the symbol.
• The larger the symbol the farther away you should
hold the scanner.
• Hold the scanner closer for symbols with bars that
are close together.
• If you have difficulty reading a label hold the
scanner beyond the recommended range in Figure
3.B and then move the scanner closer.
WRONG
3–7
Chapter 3
Using the Scanner
Troubleshooting
This section provides a list of things to check if you
are having problems scanning.
Note: Scanning problems are most often caused
by poor quality bar code symbols. If scanning
problems arise test your bar code system using the
high quality bar code test symbols supplied in
Appendix A.
• Make sure the scanner is configured to read the
the type of bar codes you are trying to scan.
• Check if the bar code symbol is worn or damaged.
• Verify that you are holding the scanner at an angle.
• Make sure the beam crosses every bar and space
on the symbol.
• Check for loose cable connections.
• Check that there is power to the scanner and the
host computer or terminal.
If you perform these checks and the symbol still does
not scan, contact your Allen-Bradley representative.
3–8
Chapter
Setup Instructions
4
A–B
Chapter Objectives
Installing Wedge Interface
This chapter provides setup instructions including:
• Installing the Wedge Interface
• Enabling Wedge Mode
• Selecting T erminal Type
• Scanner Configuration Guidelines
• Scanner Default Settings
Figure 4.1 shows the basic connections for installing
the scanner as a keyboard wedge interface. The
installation uses two cables: the scanner interface
cable and the wedge interface cable. Cables for the
different terminal types are listed in Table 2.A.
Figure 4.1
Keyboard Wedge Interface Connections
Optional Power Supply
Catalog No. 2755-PW1
1
AC
Power Source
Computer
or T erminal
Power Supply
Receptacle
Wedge
Interface Cable
1
Optional power supply required for DEC terminals.
Scanner
2755-G3-W or
2755-G6-W
4–1
Chapter 4
Setup Instructions
Connecting Scanner Interface Cable
The scanner interface cable has a modular plug
(resembling a telephone connector) on one end and a
DB9 squeeze-to-release connector on the other end.
T o install the interface cable:
Insert the modular plug into the opening at the
bottom of the scanner’s handle (Figure 4.2). The
modular plug is keyed to insure proper insertion.
Press firmly until the plug clicks into place.
Figure 4.2
Connecting Scanner Interface Cable
4–2
Chapter 4
Setup Instructions
Removing Scanner Interface Cable
At some point you may have to replace the interface
cable with another cable.
CAUTION:
Do not remove the scanner interface cable
!
until the host computer/terminal is turned
off. Failure to do this could result in
damage to the scanner.
T o remove the interface cable, follow these steps.
1. Turn power to computer/terminal off.
2. Disconnect optional power supply from AC
power source.
3. Disconnect scanner from wedge interface cable.
4. Insert a straightened paper clip into the cable
release hole as shown in Figure 4.3.
5. Press down firmly on the paper clip to release the
retainer and gently pull the connector out of the
scanner.
Figure 4.3
Removing Interface Cable
Cable Release Hole
4–3
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