Symbol LT 1804 Installation and operation manual

LT 1804 (RS-232/Synapse)
Product Reference Guide
70-32537-01
Revision A
October 1997
About This Manual
Table of Contents
Glossary
Copyright
Feedback
Index
Click on red text at any location in the manual to jump to the
specified chapter, topic, or reference.

Copyright  1997 by Symbol Technologies, Inc. All rights reserved.
No part of this publication may be reproduced or used in any form, or by any electrical or
mechanical means, without permission in writing from Symbol. This includes electronic or
mechanical means, such as photocopying, recording, or information storage and retrieval
systems. The material in this manual is subject to change without notice.
Symbol reserves the right to make changes to any product to improve reliability, function,
or design.
Symbol does not assume any product liability arising out of, or in connection with, the
application or use of any product, circuit, or application described herein.
No license is granted, either expressly or by implication, estoppel, or otherwise under any
patent right or patent, covering or relating to any combination, system, apparatus,
machine, material, method, or process in which Symbol products might be used. An
implied license only exists for equipment, circuits, and subsystems contained in Symbol
products.
Symbol Technologies, Inc.
One Symbol Plaza
Holtsville, N.Y. 11742-1300
http://www.symbol.com
FCC Information
This device complies with Part 15 of the FCC rules, and Canadian RSS:210. Operation is
subject to the following two conditions: (1) this device may not cause harmful interference,
and (2) this device must accept any interference received, including interference that may
cause undesired operation.

Contents-i
Contents
About This Manual
Notational Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . i
Related Publications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . i
Service Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . i
Symbol Support Center. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .ii
Chapter 1. Setting Up the LT 1804
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Unpacking. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Connecting Your LT 1804 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
RS-232 Power Supply Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
RS-232 Battery Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Synapse Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Chapter 2. Scanning with the LT 1804
Scanning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
LT 1804 Decode Zone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Chapter 3. Maintenance and Specifications
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
What If... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Technical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
LT 1804 Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
LT 1804 Signal Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
Interface Cable Pinouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Chapter 4. Programming the LT 1804
Scanning Sequences. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Scanning Sequence Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Errors While Scanning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Parameter Descriptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Set Parameter Defaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
RS-232 Host Type. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Code Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Fixed Lengths for Code 2 of 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
Decode Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
Decode UPC/EAN Supplemental. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6

Contents-ii
Beep After Good Decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
Beeper Volume. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
Trigger Mode (for triggered models only). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
Decode Redundancy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
Scan and Store (Code 39 Buffering). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
Baud Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8
Parity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8
Hardware Handshaking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8
Software Handshaking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8
RTS Line State. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9
Host Serial Response Time-out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9
Transmit “No Decode” Character . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10
Stop Bit Select . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10
Scan Data Transmission Format (Synapse Hosts Only). . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10
Prefix (RS-232) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10
Suffix (RS-232) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10
Prefix/Suffix (Synapse). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11
Communications Delays and Timeouts (Intercharacter Delay) . . . . . . . . . . . . . . . . . . . . . 4-11
UPC A and E Preamble(s). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11
Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12
Standard Defaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-13
RS-232 Host Type Defaults. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-15
RS-232C Code ID Characters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-16
Beeper Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-17
Code 39 Buffering (Scan and Store). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-19
Clear Transmission Buffer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-19
Transmit Buffer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-20
Overfilling Transmission Buffer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-20
Attempt to Transmit an Empty Buffer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-20
Communication Protocols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-21
Hardware Handshaking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-21
Software Handshaking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-22
ASCII Conversion Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-24
Chapter 5. Parameter Menus
Set Default. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
RS-232 Host Type. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
Code Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4
Fixed Lengths For Code 2 of 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7
Decode Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-11
UPC/EAN Supplementals Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-14
Beep After Good Decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-16
Beeper Volume. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-18

Contents-iii
Trigger Mode (for triggered models only). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-20
Decode Redundancy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-22
Code 39 Scan and Store. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-24
Baud Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-26
Parity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-29
Hardware Handshaking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-31
Software Handshaking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-33
RTS Line State. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-35
Host Serial Response Timeout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-37
Transmit “NO DECODE” Character. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-40
Stop Bit Select . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-42
Scan Data Transmission Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-44
Prefix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-46
Suffix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-50
Prefix/Suffix (Synapse). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-55
Communications Delays and Timeouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-58
UPC-E/UPC-A Preamble . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-61
Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-63
Glossary
Index

About-i
About This Manual
The LT 1804 Product Reference Guide provides general instructions for setup,
operation, troubleshooting, maintenance, and programming.
Notational Conventions
The following conventions are used in this document:
•
Bullets (•) indicate:
- action items
- lists of alternatives
- lists of required steps that are not necessarily sequential
•
Sequential lists (e.g., those that describe step-by-step procedures) appear
as numbered lists.
Related Publications
•
LT 1810/1804 Quick Reference Guide 70-31612-XX
Service Information
If you have a problem with your equipment, contact the Symbol Support
Center. Before calling, have the model number, serial number, and several of
your bar code symbols at hand.
Call the Support Center from a phone near the scanning equipment so that the
service person can try to talk you through your problem. If the equipment is
found to be working properly and the problem is symbol readability, the
Support Center will request samples of your bar codes for analysis at our plant.

About-ii
LT 1804 Product Reference Guide: About This Manual
If your problem cannot be solved over the phone, you may need to return your
equipment for servicing. If that is necessary, you will be given specific
directions.
Note: Symbol Technologies is not responsible for any damages
incurred during shipment if the approved shipping
containerisnotused.Shippingtheunitsimproperlycan
possibly void the warranty. If the original shipping
container was not kept, contact Symbol to have another
sent to you.
Symbol Support Center
In the U.S.A, for service information, warranty information or technical assis-
tance, call:
SYMBOL SUPPORT CENTER
1-800-653-5350
If you purchased your Symbol product from a Symbol Business Partner, con-
tact that Business Partner for service.
Canada
Mississauga, Ontario
Canadian Headquarters
[phone]
Europe
Wokingham, England
European Headquarters
0734-771-222 (Inside UK)
[phone] (Outside UK)
Asia
Singapore
Symbol Technologies Asia, Inc.
337-6588 (Inside Singapore)
[phone] (Outside Singapore)

1-1
Chapter 1
Setting Up the LT 1804
Overview
LT 1804 provides the best all-around close range scanning performance,
reliability, and value available. Its physical design, which combines a
lightweight yet solid feel with excellent ergonomics for scanning, ensures
comfortable use.
The LT 1804 hand-held scanner is based on the Visible Laser Diode (VLD) as a
light source. Combined with our surface mount technology and patented
resonating harmonic scan element, this state-of-the-art scanner provides solid
state dependability. When you add this scanner to your system, you add
efficient, reliable bar code reading capability.
Laser performance gives you accuracy and faster read rates on virtually any
bar code substrate, including colors.
When operated by battery, the LT 1804 is ideal for portable data collection.
The LT 1804 weighs 6.0 ounces (170 gm) without the cable and is made
from a durable, flame retardant plastic.

1-2
LT 1804 Product Reference Guide: Setting Up the LT 1804
Unpacking
Remove the LT 1804 from its packing and inspect it for damage. If the scanner
was damaged in transit, call the Symbol Support Center at one of the telephone
numbers listed on page ii. KEEP THE PACKING . It is the approved shipping
container and should be used if you ever need to return your equipment for
servicing.
ConnectingYour LT 1804
LT 1804 scanners can be battery operated, or you can use an external power
supply
.
The scanner contains on-board discrete RS-232C communications for
connecting to RS-232C asynchronous terminals and host systems. It can also
accommodate any of the Synapse™ “Smart Cables” which allows you to
connect to a wide variety of host systems.
Note: The model number of the adapter cable depends
on the host device. See page 3-3.

1-3
LT 1804 Product Reference Guide: Setting Up the LT 1804
RS-232 Power Supply Operation
1. Make sure that the host device is powered down before you connect the
scanner.
2. Plug the connector at the end of the scanner's straight cable into the
appropriate RS-232C receiving port on your host device.
3. Plug one end of the power supply cable into the power supply port on the
side of the LT 1804 connector.
4. Connect the power supply to an AC receptacle supplying voltage of the
appropriate level.
Figure 1-1. RS-232 Power Supply Operation
LT 1804
RS-232 Compatible
Device (CRT, Etc.)
Power Supply
(Standard)

1-4
LT 1804 Product Reference Guide: Setting Up the LT 1804
RS-232 Battery Operation
1. Insert a 9-volt battery into the battery pack.
2. Plug the 9-pin connector at the end of the scanner's cable into one end of
the battery pack.
3. Usethe adapter cableto connect theLT 1804to the hostdevice.Connect one
end of this cable to the battery pack and the other to the appropriate port
on the host device (either a stationary or portable terminal).
4. If desired, plug one end of the power supply connector into the receptacle
on the side of the battery pack. Plug the other end of the connector into an
AC outlet.
The LT 1804 scanner uses either an alkaline battery or a nickel-cadmium
rechargeable battery. Low battery power is signaled by four short, high tone
beeps, as well as scanning interruptions. If this occurs, change or recharge the
battery as soon as possible.
Figure 1-2. RS-232 Battery Operation
Battery Pack
Adapter
Cable*
Portable Data
Terminal
Power Supply
(As Required)
LT 1804
*3-foot extension cable is available.
Adapter Cable

1-5
LT 1804 Product Reference Guide: Setting Up the LT 1804
Changing the Battery
1. Disconnect the battery pack.
2. To open the battery pack, push up on the flanges at one end of the pack.
3. Remove the old battery.
4. Insert the new or recharged 9-volt battery into the battery pack. Match the
positive (+) and negative (-) terminals on the battery with the
corresponding terminals in the battery pack.
Recharging a Nickel-Cadmium Battery
1. Remove the battery from the battery pack and place it in the recharging
unit.
2. To recharge the battery, follow the instructions supplied with the
recharging unit.
Figure 1-3. Portable Operation with Scanner Holster,
Battery Pack andTerminal Holster
FrontView: Belt Goes through Loop on Back of
Holster, Battery Pack, and PortableTerminal Holster

Scanner
Holster
LT 1804
BackView
Battery Pack
Portable
Terminal
Adapter
Cable
5’ Coiled
Scanner Cable

1-6
LT 1804 Product Reference Guide: Setting Up the LT 1804
Synapse Configuration
See the Synapse Interface Guide provided with your Synapse cable for setup
instructions.
Figure 1-4. Synapse Configuration
LT 1804
Host
Power Supply
(As Required)
Synapse
Adapter Cable
Synapse
“Smart
Cable”

2-1
Chapter 2
Scanning with the LT 1804
Scanning
•
Be sure the scanner is connected to the controller or portable data
terminal before you turn on the system.
•
Be sure the symbol you want to scan is within the LT 1804 scanning range
(see LT 1804 Decode Zone on page 2-2.)
• If the scanner is in triggerless mode, simply bring the scanner to the bar
code. The scan beam is in a constant blinking state which becomes steady
when the scanner is decoding a bar code.
•
If the scanner is in triggered mode, bring the scanner to the bar code and
press the trigger. The scan beam (and red LED on the top of the scanner)
illuminates for approximately 1 second, or until a successful decode.
•
Your scan beam must cross every bar and space on the symbol.
•
When the symbol has been decoded, a short, high-tone beep sounds and
the green decode LED lights.
RIGHT WRONG
012345 012345

2-2
LT 1804 Product Reference Guide: Scanning with the LT 1804
LT 1804 Decode Zone
Figure 2-1. LT 1804 Decode Zone
SCANNER NOSE
5.5 mil (0"-.75")
6 mil (0" - 1")
7.5 mil (0" - 2.2")
WIDTH OF FIELD
.5 in
1.27 cm
1 in
2.54 cm
1.5 in
3.81 cm
2 in
5.08 cm
2.5 in
6.35 cm
.5 in
1.27 cm
1.5 in
3.81 cm
2 in
5.08 cm
1 in
2.54 cm
3 in
7.62 cm
.5 in
1.27 cm
1 in
2.54 cm
1.5 in
3.81 cm
2 in
5.08 cm 5 in
12.70 cm
0 in
0 cm
DISTANCE FROM SCANNER
0 in
0 cm
13 mil (0"-5") (100% UPC/EAN)
2.5 in
6.35 cm
3 in
7.62 cm
2.5 in
6.35 cm
3 in
7.62 cm
3.5 in
8.89 cm
4 in
10.16 cm
4.5 in
11.43 cm

3-1
Chapter 3
Maintenance and Specifications
Maintenance
Cleaning the exit window is the only maintenance required. Adirty window
may affect scanning accuracy.
•
Do not allow any abrasive material to touch the window.
•
Remove any dirt particles with a damp cloth.
•
Wipe the window using a tissue moistened with ammonia/water.
•
Do not spray water or other cleaning liquids directly into the window.
•
Do not remove the nose of the scanner.
What If...
Nothing happens when you follow the operating
instructions.
You Should
•
Check the system power; check the power supply or battery pack
connections.
•
Make sure the controller is programmed to decode bar codes of the
symbology you are scanning.
•
Check for loose cable connections.
•
Make sure the symbol is not defaced.
•
Try scanning test symbols of the same code type.
Note: If after performing these checks the symbol still
does not scan, contact your distributor or call the
Symbol Support Center. See page ii for the
telephone number.

3-2
LT 1804 Product Reference Guide: Maintenance and Specifications
Accessories
Standard Accessories:
Part Number Description
70-32537-XX LT 1804 Product Reference Guide
70-31612-XX LT 1810/1804 Quick Reference Guide
50-11400-007 Shipping Box
Power Supply Operation:
RS-232C Single-Port Straight Cable:
Part Number Cable
25-17837-02 Female 9-Pin (TxD on pin 2), with power jack
RS-232C Cable Adapters:
Part Number Adapter Type
50-12100-380 9-Pin to Male 25-Pin (TxD on pin 2)
50-12100-379 9-Pin to Male 25-Pin (TxD on pin 3)
50-12100-378 9-Pin to Female 25-Pin (TxD on pin 2)
50-12100-377 9-Pin to Female 25-Pin (TxD on pin 3)
Power Supplies:
Part Number Description
50-14000-005 117V Input, 5V Output Power Supply
50-04000-083 220/240V Input, 5V Output Power Supply

3-3
LT 1804 Product Reference Guide: Maintenance and Specifications
Battery Operation:
Part Number Description
25-09075-01 Straight Cable
20-10615-01 Battery Box (5V Regulated)
Adapter Cables:
Part Number Connector Type
20-03113-02 Male, 25-Pin (TxD on pin 3)
20-03114-02 Male, 25-Pin (TxD on pin 2)
20-03115-02 Female, 25-Pin (TxD on pin 3)
20-03116-02 Female, 25-Pin (TxD on pin 2)
Coiled Extension Cables:
Part Number Description
25-08892-01 3-foot Extension Cable
Synapse Adapter Cables:
Part Number Description
25-31617-01 6-foot Straight Cable
Optional Accessories:
LT 1804 optional accessories, supplied at extra cost, include additional units of
any item list of Standard Accessories, and the following items.
Part Number Description
20-12769-01 Hands-Free Stand - Desk Mount (non-adjustable)
20-08414-01 Hands-Free Stand - Free Standing (adjustable)
20-08415-01 Hands-Free Stand - ECR Mount (adjustable)
21-08288-02 Desk-Mount Stand
23-08253-01 Wall-Mount Stand
20-08416-01 Holster/Belt Clip
Host interface cable pinouts begin on page 3-7.

3-4
LT 1804 Product Reference Guide: Maintenance and Specifications
Technical Specifications
Table 3-1.Technical Specifications
ITEM DESCRIPTION
Power Requirements 5 VDC ±10%; 120 mAaverage current (160 mApeak)
Off Current Stand-By Mode 10 µA
Decode Capability The LT 1804 scanner can be programmed to decode
the following code types: UPC/EAN, UCC/EAN
128, Code 39, Code 39 Full ASCII, Codabar,
Interleaved 2 of 5, Code 128, Discrete 2 of 5, and
Code 93. Set code length(s) for any 2 of 5 code type.
Full autodiscrimination as required.
Beeper Operation User-selectable: Enable, Disable
Beeper Volume User-selectable: Full Volume, Low Volume
Decode Depth of Field Maximum typical working distance is 5.0 in. (12.70
cm) (100% UPC/EAN); minimum element width
resolution is 5.5 mils
Scan Repetition Rate 40 (± 3) scans/sec. (bidirectional)
Skew Tolerance ± 35˚ min. (from normal)
Pitch Tolerance -20° to +60˚ (from normal)
Print Contrast Minimum 25% minimum reflectance differential, measured at
675 nm.
Ambient Light Immunity Immune to direct exposure to normal office and
factory lighting conditions, as well as direct
exposure to sunlight.
Durability 5 ft (152 cm) drops to concrete
Operating Temperature 32˚ to 104˚ F (0˚ to 40˚ C)
Storage Temperature -40˚ to 140˚ F (-40˚ to 60˚ C)
Straight Cable Length 6 ft (183 cm)
Weight (without cable) 6.0 oz. (170 gm)

3-5
LT 1804 Product Reference Guide: Maintenance and Specifications
LT 1804 Dimensions
Figure 3-1. LT 1804 Dimensions
Height: 1.8 in (4.6 cm) Handle Width: 2.0 in (5.1 cm)
Nose Width: 2.8 in (7.1 cm)
Table Height: 2.4 in (6.1 cm)
Length: 8.0 in (20.3 cm)