TransCore’s Multiprotocol Reader Extreme (MPRX) is a radio frequency
identification (RFID) reader that is specifically designed for harsh
environment applications.
Purpose of This Guide
This guide provides site planning and testing, installing, and operating instructions for
TransCore’s Multiprotocol Reader Extreme (MPRX) System, which reads Association of
American Railroads (AAR) formatted tags and TransCore Super eGo® (SeGo) protocol tags.
Before you begin installing the MPRX, TransCore recommends that you familiarize yourself
with this manual.
Intended Audience
This document is intended for use by authorized TransCore MPRX dealers, installers,
and service personnel. Because the MPRX has no operator or end-user serviceable
components or features, no end-user manual or operator guide exists. Once the system
is set up and tested by the authorized installer, MPRX operation requires no end-user
intervention. Information in this document is subject to change and does not represent a
commitment on the part of TransCore, LP.
TransCore
8600 Jeerson Street NE
Albuquerque, New Mexico 87113 USA
TransCore Technical Support
Web: www.transcore.com/rfidsupport
Phone: (505) 856-8007
ii
TransCore Proprietary
MPRX
WARNING TO USERS IN THE UNITED STATES
FEDERAL COMMUNICATIONS COMMISSION FCC
LOCATION AND MONITORING SERVICE STATEMENT
47 CFR §90.351
NOTE: The user is required to obtain a Part 90 site license from the Federal Communications
Commission (FCC) to operate this radio frequency identification (RFID) device in the United States.
The FCC ID number is FIHMPRX. Access the FCC website at www.fcc.gov to obtain additional
information concerning licensing requirements.
NOTE: Users in all countries should check with the appropriate local authorities for licensing
requirements.
FCC RADIO FREQUENCY INTERFERENCE STATEMENT
47 CFR §15.105A
NOTE: This equipment has been tested and found to comply with the limits for a Class A digital
device pursuant to Part 15 of the FCC rules. These limits are designed to provide reasonable
protection against harmful interference when the equipment is operated in a commercial
environment. This equipment generates, uses, and can radiate RF energy and may cause harmful
interference to radio communications if not installed and used in accordance with the instruction
manual. Operating this equipment in a residential area is likely to cause harmful interference, in
which case, depending on the laws in eect, the user may be required to correct the interference
at their own expense.
NO UNAUTHORIZED MODIFICATIONS
47 CFR §15.21
CAUTION: This equipment may not be modified, altered, or changed in any way without
permission. Unauthorized modification may void the equipment authorization from the FCC and will
void the warranty.
USE OF SHIELDED CABLES AND GROUNDING
47 CFR §15.27A
NOTE: Shielded cables and earth grounding the unit is recommended for this equipment to comply
with FCC regulations.
TRANSCORE, LP
USA
TransCore Proprietary
iii
System Guide
REMARQUE : L’utilisateur est tenu d’obtenir une licence d’utilisation sur site Partie 90 auprès de
la Federal Communications Commission (FCC) afin de pouvoir utiliser ce dispositif RFID (radioidentification) aux États-Unis ou au Canada. Le numéro d’identification de la FCC est FIHMPRX.Pour
obtenir de plus amples informations concernant les exigences relatives aux licences, prière de
consulter le site web de la FCC à www.fcc.gov.
REMARQUE : Il est recommandé à tous les utilisateurs, quel que soit leur pays, de consulter les
autorités locales compétentes sur les exigences de licence.
AVERTISSEMENT À L’ATTENTION DES
UTILISATEURS AUX ÉTATSUNIS
DÉCLARATION 47 CFR §90.351 CODE DES
RÈGLEMENTS FÉDÉRAUX DE LA FEDERAL
COMMUNICATIONS COMMISSION FCC SUR LES
SERVICES DE LOCALISATION ET DE CONTRÔLE
DÉCLARATION 47 CFR §15.105A DE LA FCC SUR
LES INTERFÉRENCES DES FRÉQUENCES RADIO
REMARQUE : Cet appareil a été testé et déclaré conforme à la catégorie d’un appareil numérique
de classe A en accord avec la partie 15 des directives de la FCC. Ces normes visent à assurer
une protection raisonnable contre les interférences nuisibles lorsque l’appareil est utilisé dans
un environnement commercial. Cet appareil génère, utilise et peut émettre de l’énergie RF et
peut être à l’origine d’interférences nuisibles aux communications radio s’il n’est pas installé et
utilisé en suivant les directives du manuel d’instructions. Si cet appareil est utilisé dans une zone
résidentielle, il est probable qu’il cause des interférences nuisibles. Dans ce cas, l’utilisateur
pourrait être amené à remédier aux interférences à ses propres frais, selon les lois du pays en
vigueur.
AUCUNE MODIFICATION NON AUTORISÉE
47 CFR §15.21
MISE EN GARDE : Il est interdit de modifier, d’altérer ou d’apporter des changements à cet appareil
de quelque manière que ce soit sans autorisation. Toute modification non autorisée peut annuler
l’autorisation d’utilisation accordée par la FCC et annulera la garantie.
iv
UTILISATION DE CÂBLES BLINDÉS ET MISE À LA TERRE
47 CFR §15.27A
REMARQUE : Il est recommandé d’utiliser des câbles blindés et une mise à la terre avec cet
appareil afin de répondre aux réglementations de la FCC
TRANSCORE, LP
ÉTATSUNIS
TransCore Proprietary
MPRX
WARNING TO USERS IN CANADA
INDUSTRY CANADA IC INDUSTRY CANADA’S RADIO STANDARD SPECIFICATIONS RSS137 LOCATION
AND MONITORING SERVICE IN THE BAND 902928 MHZ SECTION 2.1
NOTE: The user is required to obtain a license from Industry Canada (IC), to operate this radio
frequency identification (RFID) device in Canada. The IC ID number is 1584A-MPRX, access the IC
website at www.ic.gc.ca to obtain additional information concerning licensing requirements.
Industry Canada (IC) Industry Canada’s Radio Standard Specifications General Requirements
(RSS-GEN) for Compliance of Radio Apparatus Statement Section 8.4
This device complies with Industry Canada’s license-exempt RSSs. Operation is subject to the
following two conditions:
1 ) This device may not cause interference; and
2 ) This device must accept any interference, including interference that may cause
undesired operation of the device.
AVERTISSEMENT AUX UTILISATEURS AU CANADA
INDUSTRIE CANADA IC INDUSTRIE CANADA RADIO STANDARD SPECIFICATIONS CNR137
EMPLACEMENT ET SERVICE DE SURVEILLANCE DANS LA BANDE 902928 MHZ, SECTION 2.1
Remarque : L’utilisateur est tenu d’obtenir une licence d’Industrie Canada (IC), afin d’exploiter
ce dispositif d’identification par radiofréquence au Canada. Le numéro d’identification d’IC est
1584A-MPRX. Pour obtenir de plus amples informations concernant les exigences relatives aux
licences, prière de consulter le site web de d’IC à www.ic.gc.ca .
Radio Standard Spécifications exigences générales Industrie Canada (IC) Industrie Canada
(CNR-GEN) pour s’acquitter du Radio appareil déclaration article 8.4
Le présent appareil est conforme aux CNR d'Industrie Canada applicables aux appareils radio
exempts de licence. L'exploitation est autorisée aux deux conditions suivantes :
1 ) l'appareil ne doit pas produire de brouillage, et
2 ) l'utilisateur de l'appareil doit accepter tout brouillage radioélectrique subi, même si le
brouillage est susceptible d'en compromettre le fonctionnement.
TransCore Proprietary
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System Guide
Several agencies (OSHA, FCC, IC) have environmental guidelines regulating maximum permissible
exposure (MPE) or “safe” exposure levels that this product falls under. To ensure that proper safety
guideline for the end users of this product, i.e. Occupational (Controlled) and General Population/
Public (Uncontrolled), the recommended levels for each of the agencies are presented in the next
sections with TransCore’s recommendations for safety in the last section.
OSHA (Occupational Safety and Health Administration)
OSHA (an agency of The United States of America) legislates in the Code of Federal Regulations
(CFR) Title 29 Part 1910 Subpart G 1910.97 titled “Nonionizing radiation”, a maximum safe exposure
limit of 10 milliwatts per square centimeter (mW/cm2) during any 0.1-hour period (i.e. 6 minutes).
Using the frequency (in the middle of the band of operation of this equipment) of 915 MHz and the
highest antenna gain that this equipment is certified for use in a final installation, the minimum safe
distance was calculated to be 8in (20cm).
RADIO FREQUENCY HEALTH LIMITS FOR MPRX READER
USING AN EXTERNAL ANTENNA IN FREQUENCY BAND
OF 902.25 TO 903.75 AND 910.00 TO 921.50 MHZ
FCC (Federal Communication Commission)
FCC (an agency of The United States of America) legislates in the Code of Federal Regulations
(CFR) Title 47 Chapter I Subchapter A Part 1 Subpart I Section 1.1310 titled “Radiofrequency radiation
exposure limits” that the maximum permissible exposure (MPE) is the following:
Occupational/Controlled Exposure
Power density = frequency (in MHz)/300 mW/cm2 with an Averaging time of 6 Min
General Population/Uncontrolled Exposure
Power density = frequency (in MHz)/1500 mW/cm2 with an Averaging time of 30 Min
Using the frequency (in the middle of the band of operation of this equipment) of 915MHz and the
highest antenna gain that this equipment is certified for use in a final installation, the minimum
safe distance was calculated. The MPE minimum distances are 14in (36cm) for the Occupational/
Controlled environment, and 31.5in (80.5cm) for the General Population/Uncontrolled environment.
Industry Canada (Innovation, Science and Economic Development Canada)
vi
Industry Canada (a Department of the Government of Canada) sets out the requirements in Radio
Standards Specification RSS-102, Issue 5 guidelines, recommending a maximum safe
TransCore Proprietary
power density in W/m2. Thus, the maximum permissible exposure for general population/
uncontrolled exposure at 915MHz is 2.77 W/m2. The average time is 6 minutes. The maximum
permissible exposure (MPE) is the following:
Controlled Environment
MPRX
Power density = 0.6455*frequency (in MHz)
0.5
W/m2 with a Reference Period time of 6 Min
General Public/Uncontrolled Environment
Power density = 0.02619*frequency (in MHz)
0.6834
W/m2 with a Reference Period time of 6 Min
Using the frequency (in the middle of the band of operation of this equipment) of 915MHz and the
highest antenna gain that this equipment is certified for use in a final installation, the minimum
safe distance was calculated. The MPE minimum distances are 18in (45cm) for the Controlled
environment and 47in (120cm) for the General Public/Uncontrolled environment.
TransCore Recommendation on MPE (Maximum Permissible Exposure)
The calculated power densities and MPE distance for each of the agencies respective to the
environment is shown below.
Occupational/Controlled Environment
AgencyPower Density (mW/cm2)MPE minimum distanceTime (min)
incm
OSHA107186
FCC3.0513326
IC1.9516406
General Population/Public/Uncontrolled Environment
AgencyPower Density (mW/cm2)MPE minimum distanceTime (min)
Incm
OSHA107186
FCC0.61287230
IC0.28421066
TransCore Proprietary
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System Guide
With the equipment installed and running at the maximum transmit power of 1.6W (32dBm),
0dB transmit attenuation, using the highest gain antenna that the equipment is certified for, the
recommendation for each of the operation environments is as follows:
1 ) The antenna should be installed at least 42in (106cm) from the General Population/
Public i.e. Uncontrolled Environment.
2 ) Maintenance personnel (i.e. Occupational/Controlled Environment) must remain at least
16in (40cm) from the antenna and limit their time in the environment to 6 minutes when
the system is operating.
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TransCore Proprietary
MPRX
LIMITES D’EXPOSITION AUX RADIOFRÉQUENCES POUR LE LECTEUR MPRX
UTILISANT UNE ANTENNE EXTERNE SUR LA BANDE
DE FRÉQUENCES DE 902.25 À 903.75 ET DE 910.00 À 921.50 MHZ
Plusieurs organismes (OSHA, FCC, IC) publient des directives environnementales qui
recommandent des limites d’exposition maximale autorisée (normes MPE) ou des niveaux
d’exposition «sûrs» auxquels cet appareil se conforme. Pour faire en sorte que chaque utilisateur
final ait connaissance des directives de sécurité qui le concerne, que ce soit dans son travail
(accès contrôlé) ou pour la population générale/le grand public (accès non contrôlé), TransCore
présente les niveaux recommandés par chaque organisme dans ses recommandations sécuritaires
détaillées dans la dernière section.
OSHA (Occupational Safety and Health Administration)
Dans le Code des réglementations fédérales (CFR), Titre 29, Partie 1910, Sous-partie G 1910.97,
intitulée «Nonionizing radiation» (Rayonnements non ionisants), l’OSHA (organisme américain)
recommande un plafond d’exposition maximale de 10 milliwatts par centimètre carré (mW/cm2)
pendant une période de 0,1 heure (soit 6 minutes). En utilisant la fréquence de 915 MHz (milieu de
la bande de fréquences de cet appareil) et le gain d’antenne maximal pour lequel cet appareil a
reçu une certification d’utilisation dans une installation finale, la distance minimale sécuritaire est
de 20 cm (8 po).
FCC (Federal Communication Commission)
Dans le Code des réglementations fédérales (CFR), Titre 47, Chapitre I, Sous-chapitre A, Partie
1, Sous-partie I, Section 1.1310 intitulée «Radiofrequency radiation exposure limits» (Limites
d’exposition aux rayonnements de radiofréquence), la FCC (organisme américain) établit les limites
d’exposition maximale autorisée (normes MPE) comme suit :
Exposition professionnelle/contrôlée
Densité de puissance = fréquence (en MHz)/300 mW/cm2 avec une durée moyenne de 6 min.
Exposition de la population générale/non contrôlée
Densité de puissance = fréquence (en MHz)/1500 mW/cm2 avec une durée moyenne de 30 min.
En utilisant la fréquence de 915 MHz (milieu de la bande de fréquences de cet appareil) et le
gain d’antenne maximal pour lequel cet appareil a reçu une certification d’utilisation dans une
installation finale, la distance minimale sécuritaire est la suivante : les distances MPE minimales
sont de 36 cm (14 po) pour l’environnement professionnel/contrôlé et de 80,5 cm (31,5 po) pour la
population générale/environnement non contrôlé.
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System Guide
Industrie Canada (Innovation, Sciences et Développement économique Canada)
Le Cahier des charges sur les normes radioélectriques 102, 5e édition, d’Industrie Canada (un
ministère du Gouvernement du Canada) établit des recommandations pour une densité de
puissance maximale sécuritaire en W/m2. Ainsi, l’exposition maximale admissible pour la population
générale/non contrôlée à 915 MHz est calculée à 2,77 W/m2. La durée moyenne est de 6 minutes.
Les limites d’exposition maximale autorisée (normes MPE) sont les suivantes :
Environnement contrôlé
Densité de puissance = 0,6455*fréquence (en MHz)
0,5
W/m2 avec une durée de référence de 6 min.
Grand public/environnement non contrôlé
Densité de puissance = 0,02619*fréquence (en MHz)
0,6834
W/m2 avec une durée de référence de 6 min.
En utilisant la fréquence de 915 MHz (milieu de la bande de fréquences de cet appareil) et le
gain d’antenne maximal pour lequel cet appareil a reçu une certification d’utilisation dans une
installation finale, la distance minimale sécuritaire est la suivante : les distances MPE minimales
sont de 45 cm (18 po) pour l’environnement professionnel/contrôlé et de 120 cm (47 po) pour le
grand public/environnement non contrôlé.
Recommandations de TransCore sur les limites d’exposition maximale autorisée (normes MPE)
Les densités de puissance et la distance MPE calculées par chaque organisme pour un
environnement donné sont présentées ci dessous.
Exposition professionnelle/environnement contrôlé
Organisme
Densité de puissance (mW/
cm2)
Distance MPE minimale
Durée (en min.)
pocm
OSHA107186
x
FCC3,0513326
IC1,9516406
Population générale/environnement non contrôlé
Organisme
Densité de puissance (mW/
cm2)
Distance MPE minimale
Durée (en min.)
pocm
OSHA107186
FCC0,61287230
IC0,28421066
TransCore Proprietary
MPRX
Avec l’appareil installé et fonctionnant à la puissance de transmission maximale de 1,6W (32dBm),
0dB d’atténuation de transmission, et en utilisant le gain d’antenne maximal pour lequel l’appareil
a reçu une certification, les recommandations pour chaque environnement d’exploitation sont les
suivantes :
1 ) L’antenne devrait être installée à au moins 106 cm (42 po) de la population générale/du
grand public, c’est-à-dire d’un environnement non contrôlé.
2 ) Le personnel d’entretien (c’est-à-dire dans un environnement professionnel/contrôlé)
doit rester à au moins 40 cm (16 po) de l’antenne et limiter son temps d’exposition à 6
minutes lorsque l’appareil est en fonctionnement.
-
TransCore Proprietary
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Table of Contents
Purpose of This Guide ................................................i
Intended Audience .................................................... i
Discusses factors to be considered when developing the site plan and before
ordering equipment and installing the MPRX. These considerations include
antenna and tag alignment, site layout and trac flow, and electrical and
communications requirements.
Contains information on compatible tag models and provides procedures
for installing tags onto, and removing tags from, railcars where the MPRX is
installed.
Lists the materials needed and provides procedures to install the MPRX,
including pre-installation testing, installing the MPRX in a railside hut or NEMA
enclosure, connecting power and communications, connecting to TransCore’s
Train Recording Unit (TRU™), and marking the read zone
Provide reference information on various software-related topics
Provide reference information on various communications protocols.
configuration and operation.
Provides procedures for configuring and fine-tuning the MPRX after installing
it at the site, including marking the read zone.
Answers the most commonly asked questions about installing and maintaining
the MPRX.
Describes the interoperability between the MPRX and the TRU.
Explains how to connect one or two check tags to the MPRX.
Description
1–2
TransCore Proprietary
MPRX
Chapter Number
and Title
Appendix A – GlossaryContains frequently used terms.
Appendix B – Technical
Specifications
Appendix C – Wiring
Information
Appendix D – Command
Quick Reference
Appendix E – Compatible
Tag Information
IndexProvides an alphabetical listing of guide topics.
Provides the MPRX specifications.
Shows the wiring connections for the communications interfaces, electrical
cable connections, and the external interface signal wiring.
Lists the MPRX factory default configuration settings and provides host
software commands in numerical and alphabetical order.
Provides helpful information about tags that are compatible with the MPRX.
Description
Typographical Conventions
The conventions listed in Table 1 – 1 are used in this manual.
Table 1 – 2 Typographical Conventions
ConventionIndication
Concerns about a procedure.
Code
Dialog Box Title
Menu Item
Factory Default Settings
NoteAuxiliary information that further clarifies the current
NUL
NULL
Caution
Code, including keywords and variables within
text and as separate paragraphs, and user-defined
program elements within text appear in courier
typeface.
Title of a dialog box as it appears on screen.
Appears on a menu. Capitalization follows the
interface.
Identifies factory default settings
discussion. These important points require the user’s
attention. The paragraph is in italics and the word
Note is bold.
Zero-value ASCII character or a zero-value byte.
Zero-value pointers. Null-terminated string refers to
strings of printable ASCII characters with a zero-value
byte placed in memory directly after the last printable
character of the string.
This procedure might cause harm to the equipment
and/or the user.
TransCore Proprietary
1–3
System Guide
Licensing Requirements
An FCC license provides the user with the legal authorization to operate the MPRX on the
licensed frequencies at the site specified in the license. Only an authorized installer or
service technician can set the RF frequency of the MPRX to the frequency specified in the
FCC site license. No end-user-operated controls exist on the MPRX.
The FCC license may provide the user with protection and authorization to maintain
the system should any other RFID product be used in the licensed area after the MPRX
equipment is installed.
Users of the MPRX in the United States must obtain a license from the FCC. In the United
States, the authorized modulated (SeGo protocol operation) frequency band for this
product is 911.75 to 919.75 MHz and the authorized continuous wave (AAR-formatted
operation) frequency band is 902.25 to 903.75 MHz and 910.00 to 921.50 MHz.
The user is responsible for filing the FCC license according to FCC regulations, but the
TransCore dealer will provide assistance and support as necessary to complete these
forms. Forms are available online at the FCC internet site http://wireless.fcc.gov/uls. For
further information on obtaining the license contact TransCore.
Caution
This equipment can be set to frequency ranges outside those authorized for use in
the U.S. by the FCC. Users in all countries should check with the appropriate local
authorities for licensing requirements.
Technical Support
Authorized dealers and distributors are responsible for the direct support of all customers.
Authorized dealers and distributors needing technical support can contact:
Technical Support: Phone: (505) 856-8007
Web: transcore.com/rfidsupport
Please be prepared to answer a series of questions that are designed to direct you to the
best support resource available.
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TransCore Proprietary
MPRX
TransCore Proprietary
1–5
Chapter 2
Developing the Site Plan
System Guide
Antenna Ports
Interface Selection Switch
Host Port
Sense Port
Ethernet Port
Chapter 2 Developing the Site Plan
This chapter provides a brief description of the Multiprotocol Reader
Extreme (MPRX) and discusses site plan development for installing the
MPRX System.
System Description
The MPRX is a reader that supports Association of American Railroads (AAR) formatted
tags and TransCore’s low-cost, high-performance Super eGo® (SeGo) radio frequency
identification (RFID) technology.
The MPRX is a high-power unit that reads full frame tags. The reader output power can be
adjusted using reader commands.
The MPRX can multiplex up to four antennas, which allows a single reader to be used for
two tracks. The MPRX can support up to two AT5720 Check Tags.
Reader
The MPRX consists of an input/output (I/O) module, a power supply, a reader logic board
(also called a tag decoder), and a radio frequency (RF) transmitter/receiver (called the RF
module) in a compact enclosure. These MPRX components are contained in a highly
reliable, compact, and easy-to-install package. Figure 2 – 1 shows the Host connector,
Sense connector, Ethernet connector, Interface Selection Switch, and antenna ports
locations on opposite ends of the MPRX.
Figure 2 – 1 MPRX End Views
2–2
TransCore Proprietary
Tags
The MPRX has the capability to read TransCore AAR formatted read-only full frame tags and
TransCore SeGo protocol tags, for example, the AT5118 Harsh Environment Transportation
Tag and the AT5120 Transportation Tag.
How It Works
The MPRX directs the RF module to generate an RF signal, which is broadcast through
the external antenna mounted railside. Entering the MPRX’s reading range, a TransCore
RFID tag installed on a railcar or other asset to be tracked adds its programmed
identification information to the signal and reflects the signal back to the MPRX. The
MPRX receives this modified, or modulated signal, and decodes the tag data carried by
the reflected signal and transmits this data to the Train Recording Unit (TRU) or local host
computer for processing.
MPRX
Overview of Site Planning
Developing a site plan provides the foundation for the site’s system design and
establishes the following system configuration parameters:
• Number and general location of primary components
• Number of dierent radio frequencies required
Gathering relevant site information is crucial before applying for Federal Communications
Commission (FCC) or regulatory agency approval from the country where the equipment
is to be used and ordering and installing MPRX(s) and tags.
Also, consider the following factors when developing a site plan:
• Type of tags used
• Antenna and tag alignment
• Site layout and rail trac flow
• MPRX and/or antenna mounting requirements
• MPRX electrical requirements
• MPRX communications requirements
These factors provide relevant information regarding each site’s physical and
electromagnetic environment and the conditions under which the system must perform.
Reading of Mixed Population Tags
The MPRX reads AAR-formatted tags and TransCore’s SeGo protocol tags. The factors
that influence the readability include, but are not limited to, physical orientation and
configuration, type of read-only tag, ratio of backscatter cross-section of the tags, and
whether the tag is battery powered or beam powered.
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System Guide
Antenna and Tag Alignment
The position of the antenna and placement of the tag on the vehicle must be compatible.
Two primary criteria must be satisfied to achieve the highest read reliability:
• Tag and the antenna polarization, they must be aligned in the same direction —
both horizontal.
• The installed tag must be in a direct, unobstructed line of sight to the antenna.
Caution
A tag may not be reliably read unless the preceding criteria are met.
Polarization
The polarization of the tag must be aligned in the same direction as the antenna.
Figure 2 – 2 shows a horizontally polarized antenna and tag.
Note: Matching the tag and antenna polarization is critical to obtain optimal system
performance.
2–4
Figure 2 – 2 Tag and Antenna Orientation (horizontal polarization)
TransCore Proprietary
Figure 2 – 3 shows a tag in correct polarization for the antenna.
MPRX
Figure 2 – 3 Horizontally Polarized Tag
Unobstructed Line of Sight
For optimum readability, install the MPRX and antenna(s) and the railcar’s tag so that when
the railcar approaches the antenna(s), the tag is directly facing the antenna and the line of
sight is clear between the antenna and the tag. If there is a physical obstruction between
the tag and the antenna(s), the MPRX cannot reliably read the tags. Figure 2 – 4 illustrates
possible installation locations of an antenna in relation to a tag’s mounting location on a
railcar.
TransCore Proprietary
2–5
System Guide
Figure 2 – 4 Antenna Location Relative to Tag Position
Antenna Selection
This section contains guidelines to assist in antenna selection for an MPRX installation. The
following antennas are compatible with the MPRX installation.
AA3110 Parapanel
Appropriate for installations with the following requirements and conditions:
• 902 to 928 MHz operation
• Exposure to harsh environments
• Broad radiation pattern in one dimension, narrow in the other
• Low antenna profile
• Horizontal polarization
AA3140 PCB Log Periodic
Appropriate for installations with the following requirements and conditions:
• 845 to 950 MHz operation
• Exposure to harsh environments
• Maximum coverage at close range (<20 ft [6.1 m])
• Vertical or horizontal polarization
Site Layout and Trac Flow
The following site layout and trac flow considerations are critical when determining MPRX
installation locations:
• The MPRX read zone
2–6
TransCore Proprietary
• Other MPRXs and antennas in the area
• Reflection, refraction, and diraction of RF signals
• Existing signal interference at the site
The MPRX Read Zone
The MPRX must be able to read the tag data properly within a specified area, called the
read zone, without reading other nearby tags or interfering with other MPRXs at the site.
The following are some of the factors that aect the size and shape of the read zone:
• Mounting method used for the antenna
• Mounting location of the antenna
• Height from the ground and mounting angle of the antenna
• RF output attenuation
• Range discrimination setting
• Other sources of interference and reflection
MPRX
The railside antenna must be positioned so that the RF signal travels to and return from the
tags within the designated range and must be placed in an area where it is not likely to be
bumped out of alignment. If the antenna becomes misaligned or some nearby structure is
added or removed, system operation can be seriously aected.
For instructions on setting the read zone, refer to “Fine-Tuning and Verifying the Read
Zone” on page 8–17
Other MPRXs and Antennas in the Area — AAR-Formatted Tag
Operation
For AAR-formatted (continuous wave) tag operation, sites with more than one MPRX in
proximity should be configured with a frequency separation of at least 2 MHz from adjacent
readers. If more than one MPRX is in a multiple track application, the frequencies should
be staggered. MPRX antennas can face each other across a rail track as long as they are
multiplexed and controlled by the same MPRX. For installations where multiple antennas
are controlled by a host processor with multiple MPRXs, or where multiple MPRXs are
used in close proximity, ensure that there is adequate frequency separation between the
antennas. Contact TransCore Technical Support with any questions. Table 2 – 1 shows
examples of staggered reader frequencies in a site with up to seven readers.
TransCore Proprietary
2–7
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