Javad HPT225BT User manual

All contents in this manual are copyrighted by JAVAD GNSS.
All rights reserved.The information contained herein may not be used, accessed, copied,
stored, displayed, sold, modified, published, or distributed, or otherwise reproduced without express written
consent from JAVAD GNSS
HPT225, AW225BT, and AW225 are other names for marketing purpose
HPT225BT*
VHF Modem
Operator’s Manual
Version 1.2
Last Revised December 17, 2012

www.javad.com
© JAVAD GNSS Inc., 2012

3www.javad.com
TABLE OF CONTENTS
Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Terms and Conditions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Regulatory Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Manual Conventions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Screen Captures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Technical Assistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Chapter 1. Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
1. Getting Acquainted. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
1.1. LEDs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
1.2. Data and Power Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
1.3. External Antenna and Bluetooth Antenna Connectors. . . . . . . . . . . . . . . . . . . . . . .13
1.4. Mounting Bracket. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
1.5. Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
1.6. Literature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
1.7. External Antenna (not included) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
1.8. Storage Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Chapter 2. Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
1. Powering HPT225BT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
1.1. Power supply requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
2. Antenna Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3. Installing ModemVU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
4. Connecting HPT225BT and Computer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
4.1. Connecting through serial port. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
4.2. Connecting through USB port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.3. Connecting through Bluetooth® . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5. Configuring HPT225BT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5.1. Simplex Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.2. Half-Duplex Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
6. Checking Firmware Version. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
7. Loading New Firmware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
8. Bluetooth Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

4www.javad.com
Chapter 3. Command Line Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
1. Command Line Interface Convention . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
1.1. Software Switching to Command Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
1.2. Hardware Switching to Command Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
1.3. Switching to Data Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
2. Networking Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
2.1. LINK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
3. Serial Interfacing Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
3.1. DPORT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
3.2. MPORT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
4. Special Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
4.1. BOOT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
4.2. HELP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
4.3. SAVE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
4.4. SLEEP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
5. Diagnostics and Identification Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
5.1. INFO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
5.2. STATE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Appendix A. Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
1. HPT225BT VHF Modem Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
1.1. General Radio Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
1.2. Environmental Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
1.3. Transmitter Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
1.4. Receiver Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
2. Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
3. Connector Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Appendix B. Safety Warnings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
1. General Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Appendix C. VHF Radio Usage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Appendix D. Warranty Terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

5www.javad.com
PREFACE
Thank you for purchasing this product. The materials available in this Manual (the “Manual”) have been
prepared by JAVAD GNSS, Inc. (“JAVAD GNSS”) for owners of JAVAD GNSS products. It is designed
to assist owners with the use of HPT225BT and its use is subject to these terms and conditions (the
“Terms and Conditions”).
Note: Please read these Terms and Conditions carefully.
Terms and Conditions
USE – JAVAD GNSS modems are designed to be used by a professional. The user is expected to have a
good knowledge and understanding of the user and safety instructions before operating, inspecting or
adjusting.
COPYRIGHT – All information contained in this Manual is the intellectual property of, and copyrighted
material of JAVAD GNSS. All rights are reserved. You may not use, access, copy, store, display, create
derivative works of, sell, modify, publish, distribute, or allow any third party access to, any graphics,
content, information or data in this Manual without JAVAD GNSS’ express written consent and may only
use such information for the care and operation of your HPT225BT. The information and data in this
Manual are a valuable asset of JAVAD GNSS and are developed by the expenditure of considerable work,
time and money, and are the result of original selection, coordination and arrangement by JAVAD GNSS.
TRADEMARKS – HPT225BT™, TRIUMPH-1™, ModemVU™, JAVAD GNSS®are trademarks or
registered trademarks of JAVAD GNSS. Windows®is a registered trademark of Microsoft Corporation;
Bluetooth®word mark is owned by the Bluetooth SIG, Inc. Product and company names mentioned
herein may be trademarks of their respective owners.
DISCLAIMER OF WARRANTY – EXCEPT FOR ANY WARRANTIES IN THIS MANUAL OR A
WARRANTY CARD ACCOMPANYING THE PRODUCT, THIS MANUAL AND THE HPT225BT
MODEM ARE PROVIDED “AS-IS.” THERE ARE NO OTHER WARRANTIES. JAVAD GNSS
DISCLAIMS ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY
PARTICULAR USE OR PURPOSE. JAVAD GNSS AND ITS DISTRIBUTORS SHALL NOT BE
LIABLE FOR TECHNICAL OR EDITORIAL ERRORS OR OMISSIONS CONTAINED HEREIN;
NOR FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES RESULTING FROM THE
FURNISHING, PERFORMANCE OR USE OF THIS MATERIAL OR THE HPT225BT MODEM.
SUCH DISCLAIMED DAMAGES INCLUDE BUT ARE NOT LIMITED TO LOSS OF TIME, LOSS
OR DESTRUCTION OF DATA, LOSS OF PROFIT, SAVINGS OR REVENUE, OR LOSS OF THE
PRODUCT'S USE. IN ADDITION, JAVAD GNSS IS NOT RESPONSIBLE OR LIABLE FOR
DAMAGES OR COSTS INCURRED IN CONNECTION WITH OBTAINING SUBSTITUTE
PRODUCTS OR SOFTWARE, CLAIMS BY OTHERS, INCONVENIENCE, OR ANY OTHER

Preface
Terms and Conditions
6www.javad.com
COSTS. IN ANY EVENT, JAVAD GNSS SHALL HAVE NO LIABILITY FOR DAMAGES OR
OTHERWISE TO YOU OR ANY OTHER PERSON OR ENTITY IN EXCESS OF THE PURCHASE
PRICE FOR HPT225BT.
LICENSE AGREEMENT – Use of any computer programs or software supplied by JAVAD GNSS or
downloaded from a JAVAD GNSS website (the “Software”) in connection with HPT225BT constitutes
acceptance of these Terms and Conditions in this Manual and an agreement to abide by these Terms and
Conditions. The user is granted a personal, non-exclusive, non-transferable license to use such Software
under the terms stated herein and in any case only with a single HPT225BT or single computer. You may
not assign or transfer the Software or this license without the express written consent of JAVAD GNSS.
This license is effective until terminated. You may terminate the license at any time by destroying the
Software and Manual. JAVAD GNSS may terminate the license if you fail to comply with any of the
Terms or Conditions. You agree to destroy the Software and manual upon termination of your use of
HPT225BT. All ownership, copyright and other intellectual property rights in and to the Software belong
to JAVAD GNSS. If these license terms are not acceptable, return any unused software and manual.
CONFIDENTIALITY – This Manual, its contents and the Software (collectively, the “Confidential
Information”) are the confidential and proprietary information of JAVAD GNSS. You agree to treat
JAVAD GNSS' Confidential Information with a degree of care no less stringent that the degree of care you
would use in safeguarding your own most valuable trade secrets. Nothing in this paragraph shall restrict
you from disclosing Confidential Information to your employees as may be necessary or appropriate to
operate or care for HPT225BT. Such employees must also keep the Confidentiality Information
confidential. In the event you become legally compelled to disclose any of the Confidential Information,
you shall give JAVAD GNSS immediate notice so that it may seek a protective order or other appropriate
remedy.
WEBSITE; OTHER STATEMENTS – No statement contained at the JAVAD GNSS website (or any
other website) or in any other advertisements or JAVAD GNSS literature or made by an employee or
independent contractor of JAVAD GNSS modifies these Terms and Conditions (including the Software
license, warranty and limitation of liability).
SAFETY – Improper use of HPT225BT can lead to injury to persons or property and/or malfunction of
the product. The HPT225BT modem should only be repaired by authorized JAVAD GNSS warranty
service centers. Users should review and heed the safety warnings in Appendix C.
MISCELLANEOUS – The above Terms and Conditions may be amended, modified, superseded, or
canceled, at any time by JAVAD GNSS. The above Terms and Conditions will be governed by, and
construed in accordance with, the laws of the State of California, without reference to conflict of laws.

Preface
Regulatory Information
7www.javad.com
Regulatory Information
There are two modes implemented by firmware for the North America: <US MODE> and <CANADA
MODE>.
• <US MODE> is preloaded/preprogrammed at the factory for HPT225BT VHF Transceiver sold to
US customers.
• <CANADA MODE> is preloaded/preprogrammed at the factory for HPT225BT VHF
Transceiver sold to customers in Canada.
The selection is not available to the customer.
FCC Class A Compliance
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 radio frequency energy and, if not installed and used in accordance with the
instruction manual, may cause harmful interference to radio communications. Operation of this
equipment in a residential area is likely to cause harmful interference in which case the user will be
required to correct the interference at his own expense.
C AUTION : Any changes or modifications to the equipment not expressly approved by the party responsible for
compliance could void your authority to operate such equipment.
Canadian Emissions Labeling Requirements
This Class A digital apparatus meets all requirements of the Canadian Interference-Causing Equipment
Regulations.
Cet appareil numérique de la classe A respecte toutes les exigences du Réglement sur le matériel
brouilleur du Canada.
Industry Canada
The term “IC:” before the equipment certification number only signifies that the Industry Canada
technical specifications were met.
WEEE Directive
The following information is for EU-member states only: The use of the symbol indicates that this
product may not be treated as household waste. By ensuring this product is disposed of correctly, you will
help prevent potential negative consequences for the environment and human health, which could

Preface
Manual Conventions
8www.javad.com
the take-back and recycling of this product, please contact your supplier where you purchased the product
or consult.
Manual Conventions
This manual uses the following conventions:
Screen Captures
This manual includes sample screen captures. Your actual screen can look slightly different from the
sample screen due to the modem you have connected, operating system used and settings you have
specified. This is normal and not a cause for concern.
Example Description
FileExit Click the File menu and click Exit
Link Space This format represents titles of dialog windows/boxes, names of menu options, identifies
program interface objects, such as checkboxes, edit boxes, radio buttons, etc.
Temp
This format is used to enter various string information (e.g., file and directory names) as
well as operator commands.

Preface
Technical Assistance
9www.javad.com
Technical Assistance
If you have a problem and cannot find the information you need in the product documentation, contact
your local dealer. Alternatively, request technical support using the JAVAD GNSS World Wide Web site
at: www.javad.com.

Preface
Technical Assistance
10 www.javad.com

Chapter 1
11www.javad.com
INTRODUCTION
External extra rugged digital high power VHF radio transceiver programmable in frequency ranges from
215 to 255 MHz. The HPT225BT provides half-duplex communication with transmitter output power of
2 W in the frequency band 217 - 220 MHz and 25 W in the frequency band 220 - 222 MHz for USA; 25
W the frequency bands 217 - 218 MHz, and 219 - 220 MHz, 220 - 222 MHz for Canada. It has GMSK,
DBPSK, DQPSK, 4FSK, D8PSK, and D16QAM modulations with advanced forward error correction
and data scrambling. The output power is programmable from 320 mW to 25 W.
Figure 1. HPT225BT
The HPT225BT radio transceiver provides a high-speed Point-to-Point and Point-to-Multipoint wireless
data transfer at up to 38.4 kbps. HPT225BT supports user selectable modulation techniques (GMSK,
4FSK, DBPSK, DQPSK, D8PSK, or D16QAM), which allows the user to achieve the highest data speed
for a given range (up to 48 miles / 77 km). It also includes a selectable error correction, which improves
the functioning of the radio modem under interference.
The sophisticated features of HPT225BT include data scrambling, frequency hopping, user selectable
transmit output power level, low power consumption sleep modes, autoscannin and plug-and-play
installation for remote terminals.
The built-in software tools provide the wireless link testing, unit’s status and error statistics monitoring as
well as unit’s settings change over the air. The firmware of the HPT225BT radio transceiver resides in a
flash memory. The updating of the radio modem programs is entirely software-based. The flash memory
is re-programmable through an RS232 interface, USB, Bluetooth, or over the air. The unit’s user settings
can be changed through the built-in Command Line interface (CLI), Tracy Software or through
ModemVU.

Introduction
Getting Acquainted
12 www.javad.com
1. Getting Acquainted
The HPT225BT is a rugged and very powerful external radio transceiver 152 mm wide 84 mm deep 72
mm high, weighs 900 g.
1.1. LEDs
External LED's (see Figure 2) are used for Link and Line status indication:
1.2. Data and Power Ports
The HPT225BT data and power port are placed on the front of the unit (Figure 2).
Figure 2. HPT225BT front side
Through the data port the HPT225BT modem can be connected to RS-232 serial port with Data-Ser
Cable, DB9/DB15 (6ft/1.8m), or this port can be configured as RS422/485 and connected to the RS-422
or RS-485 ports. With Data-Ser Cable, ODU-7/DB15 (6ft/1.8m) the modem can be connected to the
JAVAD GNSS receiver.
Through the power port the HPT225BT modem can be powered. See “Powering HPT225BT” on page 15
for detailed information.
Positio
nLED Name Color Description
1 PWR Green Active if Power connected to modem
2 SYNC Red Active whenever a signal with a level sufficient for reliable reception exists on the
radio channel.
3 TX/RX Green Active if modem receives or transmits Data over serial interface
4 ALARM Red Active if modem receives or transmits Data over Bluetooth
Data port
Power port
LEDs

Introduction
Getting Acquainted
13www.javad.com
1.3. External Antenna and Bluetooth Antenna Connectors
The external antenna connects to the BNC external antenna connector and Bluetooth antenna connects to
the SMA connector which are placed on the back panel of HPT225BT.
Figure 3. External and Bluetooth Antenna Connectors
1.4. Mounting Bracket
The mounting bracket (Figure 4) connects the modem to a standard pole/adapter (Figure 4).
Figure 4. Mounting Bracket
1.5. Cables
The HPT225BT package includes standard communication and power cables for configuring the modem
and providing a power source to the modem.
Data-Ser Cable, ODU-7/DB15 (6ft/1.8m)
p/n 14-578108-01
Data-Ser Cable, DB9/DB15 (6ft/1.8m)
p/n 14-578110-01
Power Cable, PL-700/Battery Clips (8.2 ft./2.5m)
p/n 14-578111-01
External
Antenna
Bluetooth
Antenna
Mounting
Bracket

Introduction
Getting Acquainted
14 www.javad.com
1.6. Literature
HPT225BT literature, including manuals and other product information are available on the JAVAD
GNSS website (http://www.javad.com):
• HPT225BT Operator’s Manual
• Functional specifications
1.7. External Antenna (not included)
Antenna type depends on the site requirements, and may be directional or omni-directional.
Warning: Do not use HPT225BT without antenna our attenuator to avoid serious damage of your device.
1.8. Storage Precautions
1. Always clean the instrument after use. Wipe off dust with a cleaning brush, then wipe off dirt with
a soft cloth.
2. Store in a location with a temperature of -40°... +85°C, and no exposure to direct sunlight.
3. Use a clean cloth, moistened with a neutral detergent or water, to clean the modem. Never use an
abrasive cleaner, ether, thinner benzene, or other solvents.
Always make sure the instrument is completely dry before storing. Dry the modem with a soft, clean
cloth.

Chapter 2
15www.javad.com
CONFIGURATION
1. Powering HPT225BT
To power HPT225BT use the Battery kit 2 (p/n 99-587100-10).
Figure 1. Battery Kit 2
Warning: Powering HPT225BT please observe polarity!
1.1. Power supply requirements
A single external power supply is necessary to operate HPT225BT. The external power supply needs to
be Listed for US and Certified for EU countries, it needs also to be a Limited Power Source and rated for
Outdoor Use and have an output rated for +9... +16V, 10A. This may not be the same range as other
JAVAD GNSS products with which you are familiar.
C AUTION : To avoid the introduction of hazards when operating and installing, before connecting of the equip-
ment to the supply, make sure that the supply meets local and national safety ordinances and
matches the equipment’s voltage and current requirements.
C AUTION : Never attempt any maintenance or cleaning of the supply while plugged in. Always remove supply
from AC power before attempting service or cleaning.
Warning: If the voltage supplied is below the minimum specification, the modem will suspend operation. If the voltage
supplied is above the maximum specification, the modem may be permanently damaged, voiding your
warranty.
Make sure cords are located so that will not be stepped on, tripped over, or otherwise subjected to
damage or stress. Do not operate equipment with a damaged cord or plug – replace immediately.

Configuration
Antenna Installation
16 www.javad.com
To reduce the risk of damage to the equipment, pull by the plug body rather than the output cord
when disconnecting the equipment.
Do not operate the supply if it has received a sharp blow, been dropped, or otherwise damaged. Do
not disassemble the supply.
Warning: Before connecting the external power source and the modem, make sure that the power source matches the
modem’s voltage and current requirements.
2. Antenna Installation
Warning: To avoid the equipment serious damage, do not switch the modem to transmit mode if RF antenna is not
connected!
Select the type of antenna that best fits your application and the one that offers the highest dB gain. In
addition, setup your system in the highest possible location to minimize obstacles between the
transmitting and receiving systems. Always place the antenna on the highest point available. At a
minimum, set the antenna to at least ten feet above the terrain using an antenna mast.
Use coaxial cable and connectors that are impedance-matched with the radio equipment, and make sure
to use the shortest length of cable to move the signal between the radio and the antenna.
3. Installing ModemVU
ModemVUTM is a Windows® application is a configuration program for the radio modem. ModemVU is
available from the JAVAD GNSS website.
Note: Refer to the ModemVU Software Manual for full details on installing and using ModemVU Software.
ModemVU is JAVAD GNSS’s configuration utility for external modems and modems embedded in
JAVAD GNSS modems. ModemVU provides the following functions:
• Connecting a computer to an VHF modem via a serial port.
• Displaying information about the radio modem installed in the modem.
• Programming the radio modem’s settings.
• Loading the new modem firmware.
To configure the HPT225BT modem, have the following ready:
• Computer running Windows®;
• ModemVU Software installed on the computer;
• A serial cable.
1. If downloading the program from the website, extract the program files into a folder on your hard
drive.
2. Navigate to the location of the ModemVU program and double-click the Setup.exe icon.

Configuration
Connecting HPT225BT and Computer
17www.javad.com
3. Follow the on-screen installation instructions. Click Next to continue, Back to get back to previous
step, or Cancel to quit the installation.
4. Keep the default installation location or select a new location.
5. Click Finish to complete the installation.
6. If desired, create a shortcut on the computer’s desktop for quick access to ModemVU.
To uninstall ModemVU use the Start menu on your computer:
1. Navigate to the location of the ModemVU program and double-click the Setup.exe icon.
2. Follow the on-screen installation instructions.
4. Connecting HPT225BT and Computer
Once you have established a connection between the modem and the computer, you will be able to:
• Configure the modem and its components
• Send commands to the modem
Use ModemVU to load new firmware to the modem.
4.1. Connecting through serial port
To configure, or maintain HPT225BT, you need to connect the modem and a computer using RS-232,
RS-422/4851ports with Data-Ser Cable, DB9/DB15 (6ft/1.8m) p/n 14-578110-01 and start ModemVU.
Figure 2. Data-Ser Cable, DB9/DB15
4.2. Connecting through USB port
Make sure the computer has special USB driver installed (available from www.javad.com) before
continuing. To configure, or maintain HPT225BT using USB port, you need to connect the modem and a
1. To have additional information how to configure serial port as RS-422 or RS-485, please contact JAVAD GNSS customer support using
QUESTIONS System at www.javad.com

Configuration
Connecting HPT225BT and Computer
18 www.javad.com
computer using special cable (not included in the standard kit) Access Data-Ser Cable, USB/DB15
(1,8m) (p/n 14-578123-01).
Figure 3. Cable p/n 14-578123-01
1. Download the zip-archive with USB driver from www.javad.com;
2. Extract the archive to the new empty folder;
3. Connect the USB port of the computer to the USB port of the modem at the switched off power
supply by using of a cable.
4. Turn on your computer.
5. Power HPT225BT.
6. Widows will detect USB driver automatically. Otherwise it will ask to specify driver location.
Select the folder with extracted file.
4.3. Connecting through Bluetooth®
Note: Do not forget to attach the Bluetooth®antenna to Bluetooth antenna connector on the back panel of the
modem.
The HPT225BT modem contains Bluetooth®wireless technology that allows synchronization between
the modem and any other external device that supports Bluetooth®wireless technology.
HPT225BT and external device connection procedure varies slightly depending on the type of external
device used. In general, the connection procedure is as follows:
Note: Refer to your Bluetooth®-enabled external device documentation for more detailed connection
information.
1. Turn on a Bluetooth®-enabled external device and your receiver. The default external device
mode is Master; the modem’s Bluetooth®module mode is Slave.
2. Instruct the external device (Master) to search for the modem (Slave).
3. Once the Master device detects the modem, use the procedure described in the external device’s
documentation to connect it with the modem.

Configuration
Configuring HPT225BT
19www.javad.com
5. Configuring HPT225BT
4. Connect the computer and HPT225BT, as described in “Connecting HPT225BT and Computer”
on page 17.
5. Turn on the modem.
6. Start ModemVU.
7. Select the HPT225BT (Figure 4) in the Options window, and click OK:
Figure 4. Options window
8. Select the COM port the HPT225BT modem is connected to (Figure 5). Click Connect.
Figure 5. Connect to ModemVU

Configuration
Configuring HPT225BT
20 www.javad.com
5.1. Simplex Protocol
When the HPT225BT modem is loaded with special firmware which supports Simplex protocol1, the
ModemVU general window will be like below:
Figure 6. Radio Link tab. Simplex protocol
1. On the Radio Link tab, set the following parameters (Table 1) and click Apply.
Table 1. Modem Parameters for the Radio Link Tab
1. Simplex protocol is a communications protocol that is purely one-way, and where acknowledgments are not part of any application
protocol.
Parameter Base Modem Repeater Rover Modem
Protocol Simplex Transmitter or
Simplex Transmitter to
Repeater
Simplex Repeater Simplex Receiver
For Base, Repeater, and Rover modems the protocol type must be the same.
Mode receiver/
Echo to serial port
- ON- enables echoing to
serial port;
OFF - disables echoing to
serial port
Auto - allows receiving data
from base and repeater in
auto mode1.
Only from Repeater - allows
receive data only from
repeater2.
Only from transmitter to
Repeater - allows receive
data from base transmitter3.
Frequency Set the frequency in band 215-255 MHz with 6.25 kHz channel spacing.
For both Base and Rover modems the frequency must be the same.
Output power Select the transmission
power for the radio modem.
n/a