Rockwell Automation 2755-G6-D User Manual
ALLEN-BRADLEY
Bulletin 2755
Hand-Held Scanner
with RS-232 Option
(Catalog No. 2755-G3-D or -G6-D)
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.
PHOTOSWITCH is a registered trademark of Allen-Bradley Company, Inc.
Table of Contents
g
Hand-Held Scanner with RS-232 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. . . . . . . . . . . . . . . . . . . . . . . . .
Warnings and Cautions 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. . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Setup 2–3. . . . . . . . . . . . . . . . . . . . . . . . . . .
Serial Communication 2–3. . . . . . . . . . . . . . . . . . . .
Message Format 2–4. . . . . . . . . . . . . . . . . . . . . . . . . .
Symbology 2–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Serial Commands 2–4. . . . . . . . . . . . . . . . . . . . . . . . . . .
Ordering a Scanner 2–5. . . . . . . . . . . . . . . . . . . . . . . . . .
Scanner Accessories 2–6. . . . . . . . . . . . . . . . . . . . . . . . .
Usin
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
G
Hand-Held Scanner with RS-232 Option
Setup
Instructions
eneral
Setup
Parameters
Chapter 4
Chapter Objectives 4–1. . . . . . . . . . . . . . . . . . . . . . . . . .
Connecting Scanner to Host 4–1. . . . . . . . . . . . . . . . . . .
Installing Interface Cable 4–2. . . . . . . . . . . . . . . . . .
Removing Interface Cable 4–3. . . . . . . . . . . . . . . . .
Installing Power Supply 4–4. . . . . . . . . . . . . . . . . . .
Scanner Configuration Guidelines 4–5. . . . . . . . . . . . .
Scanner Default Settings 4–7. . . . . . . . . . . . . . . . . . . . .
Resetting Factory Defaults 4–10. . . . . . . . . . . . . . . . . . . .
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
External Trigger Operation 5–8. . . . . . . . . . . . . . . . . . .
Serial
Communication
Parameters
ii
Chapter 6
Chapter Objectives 6–1. . . . . . . . . . . . . . . . . . . . . . . . . .
Baud Rate 6–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Serial Data Transmission Parameters 6–3. . . . . . . . . . .
Protocol 6–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
XON/XOFF 6–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CTS 6–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RTS 6–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Intercharacter Delay 6–10. . . . . . . . . . . . . . . . . . . . . . . . .
Serial Transmit Buffer 6–11. . . . . . . . . . . . . . . . . . . . . . . .
Full Buffering 6–11. . . . . . . . . . . . . . . . . . . . . . . . . . . .
No Buffering 6–11. . . . . . . . . . . . . . . . . . . . . . . . . . . .
One Label Buffering 6–11. . . . . . . . . . . . . . . . . . . . . .
Table of Contents
ym
Hand-Held Scanner with RS-232 Option
Message
Format
Parameters
S
bologies
Chapter 7
Chapter Objectives 7–1. . . . . . . . . . . . . . . . . . . . . . . . . .
Message Format 7–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Prefix 7–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Suffix 7–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Scanner Identifier 7–4. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Code Identifier 7–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preamble or Postamble 7–6. . . . . . . . . . . . . . . . . . . . . . .
Preamble 7–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Postamble 7–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
No Read Message 7–10. . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 8
Chapter Objectives 8–1. . . . . . . . . . . . . . . . . . . . . . . . . .
Label Lengths 8–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Code 39 8–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Modulo 43 Check Character 8–3. . . . . . . . . . . . . . .
Transmit Stop/Start Characters 8–3. . . . . . . . . . . . .
Minimum Length 8–4. . . . . . . . . . . . . . . . . . . . . . . . .
Maximum Length 8–4. . . . . . . . . . . . . . . . . . . . . . . .
UPC (A and E) 8–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Supplements 8–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Expanded UPC-E 8–5. . . . . . . . . . . . . . . . . . . . . . . .
Transmit Number System Digit 8–6. . . . . . . . . . . .
Transmit Check Digit 8–6. . . . . . . . . . . . . . . . . . . . .
UPC to EAN Translation 8–7. . . . . . . . . . . . . . . . . .
EAN/JAN 8–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Supplements 8–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transmit Number System Digit 8–9. . . . . . . . . . . .
Transmit Check Digit 8–9. . . . . . . . . . . . . . . . . . . . .
Interleaved 2 of 5 8–10. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Check Digit 8–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Minimum Length 8–11. . . . . . . . . . . . . . . . . . . . . . . . .
Maximum Length 8–11. . . . . . . . . . . . . . . . . . . . . . . .
Standard 2 of 5 8–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Minimum Length 8–12. . . . . . . . . . . . . . . . . . . . . . . . .
Maximum Length 8–12. . . . . . . . . . . . . . . . . . . . . . . .
iii
Table of Contents
f
Hand-Held Scanner with RS-232 Option
Code 128 8–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Minimum Length 8–13. . . . . . . . . . . . . . . . . . . . . . . . .
Maximum Length 8–13. . . . . . . . . . . . . . . . . . . . . . . .
Codabar 8–14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transmit Stop/Start Characters 8–14. . . . . . . . . . . . .
Minimum Length 8–15. . . . . . . . . . . . . . . . . . . . . . . . .
Maximum Length 8–15. . . . . . . . . . . . . . . . . . . . . . . .
Serial
Commands
ications
Speci
Chapter 9
Chapter Objectives 9–1. . . . . . . . . . . . . . . . . . . . . . . . . .
Serial Command Format 9–1. . . . . . . . . . . . . . . . . . . . . .
Manual Scanning Interaction 9–2. . . . . . . . . . . . . . . . . .
ACK/NAK Protocol 9–3. . . . . . . . . . . . . . . . . . . . . . . . .
Power Standby and Serial Commands 9–4. . . . . . . . . .
Communication Parameter Changes 9–4. . . . . . . . . . . .
Chapter 10
Appendix A Bar Code Test Symbols
Appendix B Digit Selection Symbols
Appendix C Autosense Mode
Appendix D Interface Cable Pinouts
Appendix E Maintenance
Appendix F Scanner Commands
Glossary
iv
Index
3.1
.
.
.
.
.A
.A
.A7.B9.A
4
4
4
C
2
2.B
3
3.B
4.A
7
Table of Contents
Hand-Held Scanner with RS-232 Option
Figures
Scanning Ranges 3–5. . . . . . . . . . . . . . . . . . . . . . . . . . . .
1
2
3
1
System Connections 4–1. . . . . . . . . . . . . . . . . . . . . . . . .
Installing Interface Cable 4–2. . . . . . . . . . . . . . . . . . . . .
Removing Interface Cable 4–3. . . . . . . . . . . . . . . . . . . .
Autostand C–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tables
Interface Cables 2–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Scanner Accessories 2–6. . . . . . . . . . . . . . . . . . . . . . . . .
LED Indicators 3–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Scanning Ranges: Standard/Long Range Scanner 3–4
Scanner Default Settings 4–7. . . . . . . . . . . . . . . . . . . . .
Code Identifier Characters 7–5. . . . . . . . . . . . . . . . . . . .
Hexadecimal Conversion Table 7–8. . . . . . . . . . . . . . . .
Serial Programming Command Examples 9–2. . . . . . .
v
Chapter
I
Using this Manual
1
A–B
Chapter Objectives
Contents of Package
ntended
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-D or
2755-G6-D Scanner:
• Scanner
• Scanner Holder
• User Manual
No special knowledge is required to read this manual
or use the scanner. However, this manual does not
show you how to generate an application program on
the host computer to receive the scanned data.
1–1
Chapter 1
Using this Manual
Overview of Manual
This manual shows how to set up and use the scanner
with an RS-232 serial device 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
3 Using the Scanner
4 Setup Instructions
5
6
7
8 Symbology Parameters
9 Serial Commands
10 Specifications Details specifications of the scanners.
Communication Parameters
General
Operating Parameters
Serial
Message
Format Parameters
Gives an overview of scanner functions, operating modes, and scanner setup parameters.
Provides basic instructions on how to use the
scanner for non-contact scanning.
Shows how to connect the scanner to the
serial host device and how to select scanner
operating parameters.
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 serial
communications between the scanner and the
host device. Parameters are selected by
scanning bar codes.
Covers parameters that control the format of
messages transmitted to the host. Parameters
are selected by scanning bar codes.
Covers parameters that enable bar code
symbologies the scanner is capable of reading. Symbologies are disabled or enabled by
scanning bar codes.
Describes serial commands and communications between the scanner and host computer.
It also covers precautions when operating in
serial communication mode.
1–2
Chapter 1
W
R
Using this Manual
arning and
Caution Symbols
elated
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
Visible Laser Diode Hand-Held Scanners
1–3
Chapter
F
2
Overview of Scanner
A–B
Chapter Objectives
unction
of Scanner
This chapter gives an overview of the scanner
including:
• Function of Scanner
• Operating Modes
• Scanner Setup Parameters
• Serial Commands
• Accessories
The scanner is capable of scanning, decoding, and
transmitting bar code data to devices equipped with
RS-232 serial communication ports, including
personal computers and terminals.
You configure the scanner for serial communications
by modifying the built-in setup parameters of the
scanner. Parameters are selected based on the
requirements of the host device 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 8 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
application program on the host device that will
receive and store the data.
2–1
Chapter 2
g
Overview of Scanner
Operatin
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 the
scan beam path (between the reflector on the stand
and the scanner) is broken.
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:
• General Setup
• Serial Communication
• Message Format
• Symbologies
Each category controls parameters that relate to
specific functions of scanner operations or
communications with the host device.
General Setup Parameters
General setup parameters are basic to the operation
of the scanner. These parameters control:
• System Status
• Power Consumption
• Beeper Operation
• Capture Count
• Spotter Beam
• Autosense Mode
• External Trigger
General parameters are set by scanning bar code
labels in Chapter 5.
Serial Communication Parameters
The serial communication parameters define how the
scanner will communicate with the host computer
through its serial interface including:
• Baud Rate
• Serial Data Parameters
• Intercharacter Delay
• Protocol
• Serial Transmit Buffer
Serial Communication parameters are set by scanning
bar code labels in Chapter 6.
2–3
Chapter 2
Overview of Scanner
Message Format Parameters
Parameters that control the format of messages
transmitted to the host include:
• Prefix
• Suffix
• Scanner Identifier
• Code Identifier
• Preamble
• Postamble
Message Format parameters are enabled or disabled
by scanning bar codes in Chapter 7.
Symbology Parameters
The symbology parameters enable or disable the
types of bar codes the scanner is capable of reading.
The scanner supports the following symbologies:
2–4
Serial Commands
• Code 39 • UPC
• Interleaved 2 of 5 • EAN/JAN
• 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 8.
The scanner also supports a set of serial commands
that can be sent from the host to configure scanner
operations and communications between the scanner
and host device.
The serial commands perform the same functions as
scanning the menus of bar code labels. Chapter 9
covers topics related to serial programming.
Chapter 2
g
Overview of Scanner
Orderin
a Scanner
The following figure shows the catalog number
breakdown for ordering a scanner.
2755 - G 3 - D
Bulletin Number
Device TypeDevice Type
G = Gun
Scan Range
3 = Standard Range
6 = Long Range
Decoder Type
D = RS-232
2–5
Chapter 2
Overview of Scanner
Scanner Accessories
Catalog No.
2755-NCR1 RS-232 DCE, Female, 8 Foot (2.4 Meter) Coiled Cable
2755-NCR2
1
This cable is compatible with the AUX port on the Single and Dual-Head
Enhanced Bar Code Decoders (Cat. No. 2755-DS1A, -DD1A).
T able 2.A lists the RS-232 interface cables available
for the scanners. Cables are available with different
pinouts to support either DTE or DCE configurations.
Appendix D lists the pinouts for each cable.
Table 2.A
Interface Cables with 25 Pin D-Type Connector
Description
This cable is typically used with IBM PC compatible computers.
You may have to use an adapter with this cable if your
computer has a 9-pin port.
RS-232 DTE, Male, 8 Foot (2.4 Meter) Coiled Cable
1
T able 2.B lists other accessories for the scanners.
Table 2.B
Scanner Accessories
Catalog No.
2755-NS1 Scanner Holder (included with scanner).
2755-NS2
Autostand
2755-GB1 Holster Belt
2755-GH5 Scanner Holster (can function on belt or sling).
2755-PW1 5V Power Supply, 110 VAC, 60 Hz
2755-NT1 Reflective Tape, 2 inch (50.8 mm) square
2
92-39
92-47
1
Reflective tape is supplied with Autostand. Additional reflective
Circular Reflector, 3 inch (76.2 mm) diameter
2
Circular Reflector, 1 1/4 inch (31.8 mm) diameter
tape is available by ordering Catalog No. 2755-NT1.
2
Allen-Bradley PHOTOSWITCH part number.
Description
11
2–6
Chapter
Phy
Using the Scanner
3
A–B
Chapter Objectives
sical
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
Scanning Window
Trigger
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.
3–1
Chapter 3
LED
Using the Scanner
Indicators
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.
The rear of the scanner has two indicators that
provide a visual indication of scanner operation.
GOOD READ
SCANNING
3–2
T able 3.A defines the color and function of each
LED indicator.
Table 3.A
LED Indicators
LED Label
GOOD READ Green
SCANNING Yellow
Color Function
The GOOD READ light momentarily turns on
(and you will hear a beep) when a bar code
symbol has been successfully decoded.
The SCANNING light turns on when the
device is scanning.
Chapter 3
y
Using the Scanner
Safet
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
g
Using the Scanner
Scannin
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-D)
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-D)
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-D
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-D
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
g
Using the Scanner
Operatin
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 connections
between scanner, power supply,
and serial communication device.
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 indicator
will turn on momentarily.
• The red scan beam will turn off.
If you fail to scan, see the Trouble-
shooting section.
3–6
Chapter 3
B
g T
RIGHT
Using the Scanner
eep
Operatin
ips
When scanning a bar code symbol, listen for one
short, high tone. It means the bar code has been
decoded successfully.
A low-high-medium sequence of beeps on power up
means the scanner has been configured in a
continuous power mode for operation with serial
communication devices.
Hold at an Angle
Do not hold the scanner directly over the bar code. In
this position light can reflect 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.
RIGHT
• 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 T able
3.B and then move the scanner closer.
WRONG
3–7
Chapter 3
T
g
Using the Scanner
roubleshootin
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 serial
communication device.
If you perform these checks and the symbol still does
not scan, contact your Allen-Bradley representative.
3–8
Chapter
g
Setup Instructions
4
A–B
Chapter Objectives
Connectin
Scanner to Host
Host
Device
This chapter provides setup instructions including:
• Connecting Scanner to Host
• Scanner Configuration Guidelines
• Scanner Default Settings
• Resetting Factory Defaults
Before configuring parameters of the scanner, you
must connect the scanner to the host device using the
appropriate interface cable and power supply. Figure
4.1 shows the connections.
Figure 4.1
System Connections
Power Supply
Catalog No. 2755-PW1
Scanner
Cat. No. 2755-G3-D or
2755-G6-D
RS-232 Serial Port
Power Supply
Receptacle
AC
Power Source
D-Type
Connector
Cat. No. 2755-NCR1 or -NCR2
4–1
Chapter 4
Setup Instructions
Installing Interface Cable
The interface cable has a modular plug (resembling a
telephone connector) on one end and a 25 pin D-T ype
connector on the other end. The available interface
cables are listed in T able 2.A.
CAUTION:
Do not connect scanner to host until host
!
device is turned off. Failure to do this could
result in damage to the scanner.
T o install the interface cable:
1. Turn power to host computer OFF.
2. Insert the modular plug into the opening at the
bottom of the scanner’s handle (see Figure 4.2).
The modular plug is keyed to insure proper insertion. Press firmly until the plug clicks into place.
4–2
Figure 4.2
Installing Interface Cable
3. Plug the 25 pin D-Type connector into the
RS-232 receiving port of the host device.
Note: You may need an adapter if your
computer has a 9-pin port.
Chapter 4
Setup Instructions
Removing Interface Cable
At some point you may have to replace the interface
cable with another cable.
T o remove the interface cable, follow these steps.
CAUTION:
Do not remove the interface cable until host
!
device is turned off. Failure to do this could
result in damage to the scanner.
1. Turn power to host device off.
2. Disconnect power supply from AC power source.
3. Disconnect scanner from host device.
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
Chapter 4
Setup Instructions
Installing Power Supply
The external power supply (Catalog No. 2755-PW1)
provides power to the scanner. One end connects to a
standard AC receptacle supplying the appropriate
voltage level. The other end plugs into the power receptacle of the 25 pin D-T ype connector.
CAUTION:
The Catalog No. 2755-PW1 Power Supply
!
has the following polarity:
+
+5 V Ground
If using another power supply, the polarity
must be the same.
T o install the power supply:
1. Power to the host device must be turned off.
4–4
CAUTION:
Do not connect power supply until the host
!
device is turned off. Failure to follow this
caution could result in damage to the
scanner or host device.
2. Plug the circular connector into the power supply
receptacle of the 25-pin connector.
3. Plug the power supply into a standard AC
power source.
4. Review all connections. At this point all
components of the system should be connected.
Power on the host device.
5. Aim the scanner down at the work surface and
press the trigger. You should see the red beam
and the SCANNING indicator on the back
of the unit should be on.
Before configuring the scanner, review the next two
sections of this chapter.
Chapter 4
Setup Instructions
Scanner Configuration Guidelines
Configuration is the process of enabling or disabling
scanner operating parameters. The host system and
the types of bar codes that will be encountered will
determine which parameters should be enabled
or disabled.
Follow three basic steps when selecting parameters:
1. Review the rest of this manual to familiarize
yourself with each group of scanner parameters.
2. Review the requirements of your host system and
application. This will enable you to determine if
the factory defaults must be changed.
3. Enable or disable the relevant parameters by
scanning the bar codes in Chapters 5 through 8.
The section that follows describes this process.
All configuration bar code labels in this manual
are Code 128, Character Set B.
Scanning Menu Labels
The scanner does not have a distinct configuration
mode. Instead, it automatically recognizes and reacts
to labels you scan. You do not scan a label to enter
or exit configuration mode.
Most parameters are set by scanning one label. For
example, assume that to be compatible with your host
system, the scanner’s baud rate setting must be
changed from its default value of 9600 to 2400 baud.
T o make this change, locate the baud rate bar code
menu in Chapter 5 and scan the label to the left of
2400 Baud. The correct label is shown below.
DD
A successful scan is indicated by two short-high
beeps. An unsuccessful scan produces no beeps and
requires you to rescan the bar code.
Most parameters are modified in this way. When you
are finished with modifications you can resume
normal bar code scanning.
2400 Baud
4–5
Chapter 4
Setup Instructions
Note: When enabling or disabling a parameter, be
sure the scanner beam illuminates only one symbol at
a time. The layout of this manual minimizes the
accidental scanning of multiple labels.
Some parameters require that you scan multiple
labels to modify a setting. An example is the
Intercharacter Delay parameter. To set the
intercharacter delay to 5 milliseconds (msec):
1. Scan the Intercharacter Delay (GB) label and listen
for one short beep.
GB
+
Intercharacter Delay=xx msec
The dotted boxes to the right of the label indicate
that you must scan two additional labels; one for
the digit 0 and the second for the digit 5.
2. After the beep, scan the bar code beside 0 in
Appendix B, and listen for one short-high beep.
3. Scan the bar code beside 5 in Appendix B and
listen for two short beeps. The two beeps indicate
that you scanned the last parameter argument.
If you scan the Intercharacter Delay (GB) label and
then scan a normal data label (instead of 0 and 5), a
normal tone is emitted in response to the data label,
and the programming command is ignored. No exit
code is required to resume normal operations.
4–6
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