Intermec 869 RFID Reader Operating instructions

869 RFID
Reader
Service Instruction
Manual

ii 869 RFID Reader Service Instruction Manual
Intermec Technologies Corporation
Corporate Headquarters Technical Communications Department
6001 36th Ave. W. 550 Second Street SE
Everett, WA 98203 Cedar Rapids, IA 52401
U.S.A. U.S.A.
www.intermec.com
The information contained herein is proprietary and is provided solely for the purpose of allowing customers
to operate and service Intermec-manufactured equipment and is not to be released, reproduced, or used for
any other purpose without written permission of Intermec.
Information and specifications contained in this document are subject to change without prior notice and do
not represent a commitment on the part of Intermec Technologies Corporation.
E2003-2004 by Intermec Technologies Corporation. All rights reserved.
The word Intermec, the Intermec logo, Norand, ArciTech, CrossBar, Data Collection Browser, dcBrowser,
Duratherm,EasyCoder,EasyLAN,EnterpriseWirelessLAN,EZBuilder,Fingerprint,i-gistics,INCA(under
license), InterDriver, Intermec Printer Network Manager, IRL, JANUS, LabelShop, Mobile Framework,
MobileLAN, Nor*Ware, Pen*Key, Precision Print, PrintSet, RoutePower, TE 2000, Trakker Antares, UAP,
Universal Access Point, and Virtual Wedge are either trademarks or registered trademarks of Intermec
Technologies Corporation.
Throughout this manual, trademarked names may be used. Rather than put a trademark (™or ®) symbol in
every occurrence of a trademarked name, we state that we are using the names only in an editorial fashion,
and to the benefit of the trademark owner, with no intention of infringement.
There are U.S. and foreign patents pending.
Wi-Fi is a registered certification mark of the Wi-Fi Alliance.
Microsoft, Windows, and the Windows logo are registered trademarks of Microsoft Corporation in the
United States and/or other countries.
Bluetooth is a trademark of Bluetooth SIG, Inc., U.S.A.

Contents
iii869 RFID Reader Service Instruction Manual
Contents
Before You Begin vii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Safety Summary vii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Do not repair or adjust alone vii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
First aid vii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Resuscitation vii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Energized equipment vii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Safety Icons viii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
lobal Services and Support ix. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Warranty Information ix. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Web Support ix. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Telephone Support ix. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Who Should Read this Manual? x. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Related Documents x. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Information 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Introduction 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Purpose of Equipment 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RFID Reader Specifications 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Receiver 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transmitter 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Antenna (RF) Connections 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Physical Specifications 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
869 MHz Specific 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Frequency Reference Source 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transmitter 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
915 MHz Specific 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Frequency Reference Source 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transmitter 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1

Contents
iv 869 RFID Reader Service Instruction Manual
Theory of Operation 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
eneral Description 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reader Module 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
869 Serial Reader Module 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LED Indicators 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Connector 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
869 Reader Module Power Considerations 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Serial Communication 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LED Plug 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
13 Pin Female Circular DIN PIO ( eneral Purpose I/O) Connector 11. . . . . . . . . .
Digital Architecture 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Overview 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Memory 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Flash 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SDRAM 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SPI Serial Interface 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LATTICE ANTI-ALIASIN FILTERS AND AMPLIFIERS 14. . . . . . . . . .
D/A CONVERTER 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RECONSTRUCTION FILTERS 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parallel I/O Peripherals 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A/D CONVERTER 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CPLD 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
UART 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RF Section 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Test Setup and Maintenance 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Set Up 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Test Procedures 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Test Notes 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagrams and Parts Lists 43. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Introduction 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Disassembly 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing the Barrel Connector Power Jack 26. . . . . . . . . . . . . . . . . . . . . . . .
Removing the Power Switch 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing the Antenna End Plate 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Assembly 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts List 29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2
3

Before You Begin
iii869 RFID Reader Service Instruction Manual
Before You Begin
This section provides you with safety information, technical support inforĆ
mation, and sources for additional product information.
Safety Summary
Your safety is extremely important. Read and follow all warnings and cauĆ
tions in this document before handling and operating Intermec equipĆ
ment. You can be seriously in ured, and equipment and data can be damĆ
aged if you do not follow the safety warnings and cautions.
Do not repair or adjust alone
Do not repair or ad ust energized equipment alone under any circumĆ
stances. Someone capable of providing first aid must always be present for
your safety.
First aid
Always obtain first aid or medical attention immediately after an in ury.
Never neglect an in ury, no matter how slight it seems.
Resuscitation
Begin resuscitation immediately if someone is in ured and stops breathing.
Any delay could result in death. To work on or near high voltage, you
should be familiar with approved industrial first aid methods.
Energized equipment
Never work on energized equipment unless authorized by a responsible
authority. Energized electrical equipment is dangerous. Electrical shock
from energized equipment can cause death. If you must perform authoĆ
rized emergency work on energized equipment, be sure that you comply
strictly with approved safety regulations.

Before You Begin
iv 869 RFID Reader Service Instruction Manual
Safety Icons
This section explains how to identify and understand dangers, warnings,
cautions, and notes that are in this manual. You may also see icons that tell
you when to follow ESD procedures and when to take special precautions
for handling optical parts.
A warning alerts you of an operating procedure, practice, condition, or
statement that must be strictly observed to avoid death or serious in ury to
the persons working on the equipment.
Avertissement: Un avertissement vous avertit d'une procédure de
fonctionnement, d'une méthode, d'un état ou d'un rapport qui doit être
strictement respecté pour éviter l'occurrence de mort ou de blessures graves
aux personnes manupulant l'équipement.
A caution alerts you to an operating procedure, practice, condition, or
statement that must be strictly observed to prevent equipment damage or
destruction, or corruption or loss of data.
Attention: Une précaution vous avertit d'une procédure de
fonctionnement, d'une méthode, d'un état ou d'un rapport qui doit être
strictement respecté pour empêcher l'endommagement ou la destruction
de l'équipement, ou l'altération ou la perte de données.
Note: Notes either provide extra information about a topic or contain
special instructions for handling a particular condition or set of
circumstances.

Before You Begin
v869 RFID Reader Service Instruction Manual
Global Ser ices and Support
Warranty Information
To understand the warranty for your Intermec product, visit the Intermec
web site at http://www.intermec.com and click Service & Support. The
Intermec Global Sales & Service page appears. From the Service & SupĆ
port menu, move your pointer over Support, and then click Warranty.
Disclaimer of warranties: The sample code included in this document is
presented for reference only. The code does not necessarily represent comĆ
plete, tested programs. The code is provided as is with all faults." All warĆ
ranties are expressly disclaimed, including the implied warranties of merĆ
chantability and fitness for a particular purpose.
Web Support
Visit the Intermec web site at http://www.intermec.com to download our
current manuals in PDF format. To order printed versions of the Intermec
manuals, contact your local Intermec representative or distributor.
Visit the Intermec technical knowledge base (Knowledge Central) at
http://intermec.custhelp.com to review technical information or to request
technical support for your Intermec product.
Telephone Support
These services are available from Intermec Technologies Corporation.
Service Description
In the U.S.A. and Canada
call 1Ć800Ć755Ć5505
and choose this option
Factory Repair and
OnĆsite Repair
Request a return authorization
number for authorized service
center repair, or request an
onĆsite repair technician.
1
Technical Support Get technical support on your
Intermec product.
2
Service Contract
Status
Inquire about an existing
contract, renew a contract, or ask
invoicing questions.
3
Schedule Site Surveys
or Installations
Schedule a site survey, or request
a product or system installation.
4
Ordering Products Talk to sales administration,
place an order, or check the
status of your order.
5
Outside the U.S.A. and Canada, contact your local Intermec representaĆ
tive. To search for your local representative, from the Intermec web site,
click Contact.

Before You Begin
vi 869 RFID Reader Service Instruction Manual
Who Should Read this Manual?
This manual contains information necessary to repair the 869 RFID ReadĆ
er. It provides an exploded view of the reader, the parts lists, and informaĆ
tion on testing the RFID reader with Intermec test equipment.
This manual is written for service technicians.
Related Documents
Document Title art Number
869 RFID Reader Quick Start Guide 962Ć054-064
The Intermec web site at http://www.intermec.com contains many of our
documents that you can download in PDF format.
To order printed versions of the Intermec manuals, contact your local InĆ
termec representative or distributor.
Patent Information
Product is covered by one or more of the following patents:
4,455,523; 5,627,360; 4,553,081; 5,657,317; 4,709,202; 5,671,436;
4,845,419; 5,684,290; 4,961,043; 5,777,309; 5,195,183; 5,793,604;
5,216,233; 5,805,807; 5,218,187; 5,818,027; 5,218,188; 5,821,523;
5,227,614; 5,828,052; 5,241,488; 5,831,819; 5,278,487; 5,834,753;
5,322,991; 5,841,121; 5,331,136; 5,844,222; 5,331,580; 5,883,492;
5,349,678; 5,883,493; 5,397,885; 5,886,338; 5,371,858; 5,889,386;
5,373,478; 5,898,162; 5,410,141; 5,969,328; 5,488,575; 5,986,435;
5,500,516; 6,075,340; 5,504,367; 6,109,528; 5,508,599; 6,158,661;
5,530,619; 6,234,395; 5,567,925; 6,244,512; 5,568,645; 6,330,975;
5,592,512; 6,431,451; 5,598,007, 6,497,368; 5,617,343; 6,538,413.
There may be other U.S. and foreign patents pending.

General Information
1
This section of the manual explains the purpose of the reader, and contains
the mechanical and electrical specifications.

General InformationChapter —1
2 869 RFID Reader Service Instruction Manual
Introduction
This service instruction book (SIB) contains the theory of operation,
maintenance procedures, and diagrams and parts lists for the Intermec®
69 RFID reader. The 69 Reader is shown below. Refer to the following
pages for the reader specifications.
Purpose of Equipment
The RFID Reader is suitable for applications such as security, pallet load
tracking and warehouse management.
869 MHz RFID Reader
Additional information about the reader, its capabilities, and how it is
setĆup and used can be found in the 869 Reader Quick Start Guide (PN
962Ć054Ć064).

General Information—Chapter 1
869 RFID Reader Service Instruction Manual
RFID Reader Specifications
Receiver
SProtocol: Intellitag
SReceiver type: Homodyne I/Q
SCoding: FM0 from tag to reader
SLow Pass Frequency response of receiver I/Q outputs: 200/ 00 kHz
SSensitivity: 5dB better than required to receive a beam powered tag
SData Rates: 32 ć 40 kbps
SAlternate Data Rate : 12 ć 160 kbps
Transmitter
SProtocol: Intellitag
STransmitter typeAmplitude modulation, OOK
SCoding Manchester: from reader to tag
SSecondarily emitted RF: < -54 dBm
SStandby to Tx 30 µS maximum
SMaximum phase noise @ 32 kHz: -75dBc/Hz or better
SStability: <+/-30 ppm @25_C
SAttenuator control range: 20 dB
Antenna (RF) Connections
SNumber of antennas: up to 4, electronically switched
SSwitching rate: 30µS or less
SAntenna Port Isolation: 22 dB or better
SRequired Antenna return loss: -14 dB
Physica Specifications
SPhysical size: Reader: .25" x 5.30" x 2.90"
SPhysical weight: Reader: 1.1 kg (3 .4 oz.)

General InformationChapter —1
4 869 RFID Reader Service Instruction Manual
869 MHz Specific
Frequency Reference Source
SSource type: Fixed Channel Licensed
SChannel retention method: NVRAM
SCenter frequency of channel: 69.525 MHz
SUsable channels: 1
SChannel spacing:Single Channel Operation
Transmitter
SOutput Power minimum: 25.5 dBm
Stypical: 26.5 dBm
Smax: 27.0 dBm
SModulationRaised Cosine, TBD
SGoal: Single Side-band
SOccupied frequency bandwidth: < 250 kHz
SSpurious emissions level: < - 37 dBm
SData Rates: 32 ć 40 kbps
SAlternate Data Rates : ć 12 kbps
915 MHz Specific
Frequency Reference Source
SSource type: Frequency hopper
SFrequency Band: 902-927.7MHz
SUsable Channels: 64
SHopping rate: <= 100 mS
SHopping time: 30µS within channel
Transmitter
SOutput Power: minimum: 2 .5 dBm
Stypical: 29.5 dBm
Smax: 30.0 dBm
SModulation: 99%, 40 dB on/off
SData Rates: 33 ć 40 kbps

Theory of Operation
2
This chapter of the manual outlines the theory of operation for the
Intermec 869 MHz RFID reader.

Theory of OperationChapter —2
6 869 RFID Reader Service Instruction Manual
1 General Description
The 869 reader provides asic tag identifies, reads and writes at oth 869
& 915 MHz. The RF oard supports 4 antenna ports simultaneously. The
DSP engine supports asynchronous serial communication using RS-232 to
connect to a host. The General Purpose Input/Output (GPIO) connector
allows the 869 reader to monitor and/or control external devices. This
would allow, for instance, a conveyer position switch to activate the reader
for tag operations.
The reader has an on/off power switch and is powered from an external
DC source. Four LED status indicators are located on the serial connector
side of the reader. It operates under 2 watts, so it is capa le of continuous
operation.
The reader contains the manager function that provides communication to
the host. The host must support the command strings used y the managĆ
er.
In the 869 MHz and, the 869 reader utilizes the raised cosine modulation
envelope to reduce the andwidth of the transmissions. Raised cosine
modulation is a digital filter, which programs the DSP to form a resultant
response. In this case, it has een programmed to respond according to
the harmonic content of the output waveform. This modulation is unique
and the andwidth can est e descri ed y:
Bandwidth = (1+α)/2Ts where
a = roll-off factor
Ts = one sampling time period
The net result from the raised cosine approach is that the output envelope
has a very low harmonic content, which dramatically reduces unwanted
harmonic and spurious energy in the output waveform.
The 869 reader also utilizes a pre-distortion filter. Pre-distortion was imĆ
plemented to the ase and modulation envelope to compensate for non-
linearities in the mixer and power amplifier circuits. To meet the spectral
occupancy requirements for ERC/DEC/(01)04, it is essential to keep the
up-conversion and amplification of the data very linear. To accomplish
this, the output power was reduced to 500 mW, the driver kept out of
compression, and the dynamic range of the mixer was limited to increase
its resolution.
Pre-distortion also has the effect of reducing transmit harmonics and inĆ
creasing spectral containment. The pre-distortion was implemented y
re-mapping the values outputted y the DAC, to a discrete power level at
the transmitter's output, as opposed to a ase and voltage level. This efĆ
fectively compensates for a non-linear transfer etween the ase and data
and the transmitted power level. The entire DAC range wasn't computed,
ut only the points necessary to uild the raised cosine filtered data stream.

Theory of Operation—Chapter 2
869 RFID Reader Service Instruction Manual
Reader Module
The 869 reader module is comprised of the DSP engine, RF circuitry,
power regulation circuitry and other necessary components. The reader
module is constructed from a printed circuit oard assem ly, suita le RF
shielding, and incidental hardware. The 869 reader module is a su -asĆ
sem ly of the 869 Reader.
869 Serial Reader Module
An electrical lock diagram of the reader module is shown in Figures 1 and
2. External connections may connect directly to the circuit card's connecĆ
tor, for items such as DC power, or RF signals, and the circuit oard genĆ
erated/processes these signals. Additionally, it has external connectors for
data communications and GPIO signals.
Figure 1 Digital Section

Theory of OperationChapter —2
8 869 RFID Reader Service Instruction Manual
Figure 2: RF Section

Theory of Operation—Chapter 2
9869 RFID Reader Service Instruction Manual
LED Indicators
The indicators for the 869 Serial Reader are right angle panel-mount
LED's located on the 869 Reader module. Four LEDs (left to right)indiĆ
cate :
1Power applied and processor active (on/off )
2Serial data communications active
3RF power on/off, and
4Packet transaction from tag occurred.
In addition, a 6 pin header location is availa le to allow the LED signals to
e externally availa le.
Interface Connections - External Connectors for 869 Serial Readers
Connection Function Connector Description
Power Input power to energize reader 8-10 volts DC Power Connector
on RF Module
RF connectors Four RF connectors for external
antennas
Reverse SMA Connector on RF
Module
Serial Data
CommunicaĆ
tion
Serial Communications for sendĆ
ing/receiving RDID Data
DB9 Connector with RS-232
GPIO General Purpose Digital Inputs
and Outputs for triggering relay
drivers
Circular DIN 13 pin Connector
on RF Module; 4 Inputs, 4 OutĆ
puts, 4 Ground pins
LED Plug Provision for remote mounted
LEDs
6 pin 2 Row Right Angle ConĆ
nector

Theory of OperationChapter —2
10 869 RFID Reader Service Instruction Manual
Power Connector
The reader requires 8 to 10 volts DC at 2 amps.
The reader is powered through a 2-pin Bulkhead Barrel Connector,
Switchcraft part # 712A.
The Intermec power supply delivers 9 Volts DC at 2.4 Amps.
Mating plugs for this connector are Switchcraft part # 760, 760K or 761K.
A ca le within the PSR connects the ulkhead arrel connector (via an
endplate switch) to the 2-pin Molex connector on the Intellitag Reader
Module.
869 Reader Module Power Considerations
The 869 Reader module uses the PSR case as a heat sink. The enclosure
used to house the modules provide sufficient thermal dissipation to keep
them within the specified operating temperature range.
The user must re-certify the product if the integration of the 869 Reader
Module uses a different power supply or antennas.
Antenna ports must have either antennas or termination loads connected
during operation. The Intermec part # for the termination load is
345-004-001.
Serial Communication
The 869 Serial Reader has a DB9 female connector for data communicaĆ
tion. The maximum data rate (and default) is 115.2K aud, with 8 data
its, no parity it and 1 stop it.
The following ta le descri es the pin-out of the RS-232 interface.
RS-232 Interface
Pinout Signal Direction Description
1 Reserved - Reserved
2 TXD (from reader) Output to host Serial data to host
3 RXD (from reader) Input from host Serial data from
host
4 Reserved - Reserved
5GND N/A Ground
6 Reserved - Reserved
7 CTS (from reader) Input from host Clear to Send
8 RTS (from reader) Output to host Request to send
from host
9 Reserved - Reserved
The maximum distance from the product to a host, modem, or other
physical controller interface, such as a fi er optics converter or relay is
50-ft (15.2 m) for RS-232.

Theory of Operation—Chapter 2
11869 RFID Reader Service Instruction Manual
LED Plug
A oard loading location is provided for a 6 pin right angle header to drive
the LED indicators remotely. A 5.0 Vdc 20mA drive circuit is availa le for
each indicator. The Intermec part num er for the right angle header is
311-677-001. The plug is 3 rows y 2 columns with 0.1" on center spacĆ
ing.
The ta le elow shows the pin out for the right angle header.
LED Interface
Pinout Signal Direction
1 Tag Transaction occurred Output
2 RF Power ON/OFF Output
3 GND N/A
4GND N/A
5 Power ON; Processor Running Output
6 Serial Data Communiction AcĆ
tive
Output
1 Pin Female Circular DIN GPIO (General Purpose I/O) Connector
A general purpose I/O (Input/Output) connector provides signal lines in
and out of the READER allowing monitoring and/or control of external
devices or functions.The connector for this is a 13-pin female circular
DIN. The male mating connector for attaching to this is a CUI # SD-130,
one source is Digi-Key # CP-1013-ND. Intermec P/N: 351-184-001.
General Purpose Input/Output Interface
Pinout Signal Direction Description
1GPIO IN0 Input GPIO Input 0
2 GPIO IN1 Input
3 GPIO IN2
4 GPIO IN3 -
5 GPIO OUT0 Output GPIO Output 0
6 GPIO OUT1 Output GPIO Output 1
7 GPIO OUT2 Output GPIO Output 2
8 GPIO OUT3 Output GPIO Output 3
9-13 Each connects to ground
through individual 10
ohm resistors
- Reserved
Outputs and inputs have 12-volt transient suppression devices to ground
at the connector.

Theory of OperationChapter —2
12 869 RFID Reader Service Instruction Manual
Output signals are driven y using 2N3904 NPN transistors (low level)
with a 100-kΩ pull-up to +5 volts through a silicon diode, giving a out a
4.3-volt high level.
An output can e pulled high from an external source as high as 12 volts.
This will however tend to pull the other outputs higher (through two
100kΩ resistors). The low level will e a out 0.1 volt up to a out 30 milĆ
liamp. The output low voltage will clim higher as the sink current inĆ
creases.
There is no protection on this output. The user will need to ensure their
load will not require the Reader to sink more than 50 milliamps.
Input signals should e 0 to +1.5 volt for a low input and +3.5 to +5 volts
for a high input. Each input has a 1.1 kΩ resistor in series with clamping
diodes, ut only a out 1 A is used until the input exceeds the 0 to +5 volt
input range. There is also a weak (100 kΩ) pull-up to +5 volt on each inĆ
put.