Hemisphere GPS SBX-4 Assembly Instructions

875-0176-000
Integrator Guide
SBX-4
OEM Board
Revision: B2
January 12, 2018

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This device complies with part 15 of the FCC Rules. 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.
ThisproductcomplieswiththeessentialrequirementsandotherrelevantprovisionsofDirective2014/53/EU.Thedeclarationofconformitymaybe
consultedathttps://hemispheregnss.com/About‐Us/Quality‐Commitment.
Copyright Notice
Copyright Hemisphere GNSS, Inc. (2017). All rights reserved.
No part of this manual may be reproduced, transmitted, transcribed, stored in a retrieval system or
translated into any language or computer language, in any form or by any means, electronic,
mechanical, magnetic, optical, chemical, manual or otherwise, without the prior written permission of
Hemisphere GNSS.
Trademarks
Hemisphere GNSS®, the Hemisphere GNSS logo, TRACERTM, Crescent®, EclipseTM, e-Dif®, L-DifTM,
miniEclipseTM, PocketMax3 PCTM, PocketMax3TM, PocketMax3TM, S320TM, SBX-4TM, VectorTM,
XF1TM,and XF2TM are proprietary trademarks of Hemisphere GNSS, Inc. Other trademarks are the
properties of their respective owners.
Patents
Hemisphere GNSS products may be covered by one or more of the following patents:
U.S. Patents
Australia Patents
6111549 6876920 7400956 8000381 8214111 2002244539
6397147 7142956 7429952 8018376 8217833 2002325645
6469663 7162348 7437230 8085196 8265826 2004320401
6501346 7277792 7460942 8102325 8271194
6539303 7292185 7689354 8138970 8307535
6549091 7292186 7808428 8140223 8311696
6711501 7373231 7835832 8174437 8334804
6744404 7388539 7885745 8184050 RE41358
6865465 7400294 7948769 8190337
Other U.S. and foreign patents pending.
Notice to Customers
Contact your local dealer for technical assistance. To find the authorized dealer
near you:
Hemisphere GNSS, Inc
8515 East Anderson Drive
Scottsdale, AZ 85255 USA
Phone: [phone]
Fax: [phone]
[e-mail]
www.hgnss.com
Technical Support
If you need to contact Hemisphere GNSS Technical Support:
Hemisphere GNSS, Inc.
8515 East Anderson Drive
Scottsdale, AZ 85255 USA
Phone: [phone]
Fax: [phone]
[email protected]
Documentation Feedback
Hemisphere GNSS is committed to the quality and continuous improvement of our products and
services. We urge you to provide Hemisphere GNSS with any feedback regarding this guide by writing
to the following email
address: [e-mail].

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Table of Contents

Copyright Notice ............................................................................................................................................. i
Trademarks .................................................................................................................................................... i
Patents ........................................................................................................................................................... i
Notice to Customers ....................................................................................................................................... i
Technical Support .......................................................................................................................................... i
Documentation Feedback .............................................................................................................................. i
Terms and Definitions .................................................................................................................................. iii
Chapter 1: Introduction .................................................................................................................................. 1
Product Overview ........................................................................................................................................ 2
Chapter 2: Integrating the SBX-4 .................................................................................................................. 3
Mechanical Layout ....................................................................................................................................... 4
LED Indicators ............................................................................................................................................. 7
SBX-4 Block Diagram .................................................................................................................................. 8
SBX-4 Connector Pin Assignments ............................................................................................................. 9
Signal Lock Indicator Pin ........................................................................................................................... 10
Reset Pin ................................................................................................................................................... 11
Antenna Interface ...................................................................................................................................... 12
Radio Frequency Immunity and Emissions ............................................................................................... 12
SBX-4 Dual Serial Port Overview .............................................................................................................. 13
Single Serial Port Operation ................................................................................................. 1 3 
Dual Serial Port Operation .................................................................................................... 13
Factory Default Settings ............................................................................................................................ 14
SBX-4 Integration Summary ...................................................................................................................... 14
Chapter 3: SBX-4 Operation ....................................................................................................................... 16
Introduction .................................................................................................................................................. 1
Beacon Information ..................................................................................................................................... 1
Operating Modes ......................................................................................................................................... 2
Automatic Beacon Search (ABS) Mode ................................................................................. 2
ABS Global Search ................................................................................................................. 2
ABS Background Search ........................................................................................................ 3 
Manual Mode .......................................................................................................................... 3
Database Mode ...................................................................................................................... 3
NEW SBX-4 Commands ............................................................................................................................. 4
Evaluating Performance .............................................................................................................................. 6
Appendix A: Troubleshooting ........................................................................................................................ 7
Appendix B: Technical Specifications ......................................................................................................... A1
SBX-4 Specifications ................................................................................................................................. B2

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
Terms and Definitions
The following table lists the terms and definitions used in this document
Term Definition
DGPS/DGNSS Differential GPS/GNSS refers to a receiver using Differential
Corrections.
Firmware Firmware is the software loaded into the receiver that controls
the functionalit
y
of the receiver and runs the GNSS en
g
ine.
GNSS Global Navigation Satellite System (GNSS) is a system that
provides autonomous 3D position (latitude, longitude, and
altitude) along with very accurate timing globally by using
satellites. Current GNSS providers are: GPS, GLONASS and
Galileo. BeiDou is expected to have
g
lobal covera
g
e b
y
2020.
GPS Global Positioning System (GPS) is a global navigation
satellite s
y
stem implemented b
y
the United States.
NMEA National Marine Electronics Association (NMEA) is a marine
electronics organization that sets standards for
communication between marine electronics.
RTCM Radio Technical Commission for Maritime Services (RTCM) is
a standard used to define RTK message formats so that
receivers from an
y
manufacturer can be used to
g
ether.
SBAS Satellite Based Augmentation System (SBAS) is a system that
provides differential corrections over satellite throughout a
wide area or re
g
ion.
Signal-to-Noise Ratio Signal-to-Noise Ratio (SNR) is the ratio of the message
content of the si
g
nal a
g
ainst the noise of the si
g
nal.
Subscription A subscription is a feature that is enabled for a limited time.
Once the end-date of the subscription has been reached, the
feature will turn off until the subscription is renewed.

SBX-4 Integrator Guide Chapter 1 - Introduction Page 1 of 22
Chapter 1: Introduction
Product Overview

SB
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-4 Integrator Guide Chapter 1 - Introduction Page 2 of 22


Chapter 1: Introduction
Product Overview
Welcome to the SBX-4 Integrator Manual and thank you for considering Hemisphere GNSS for
your differential GPS requirements. The purpose of this manual is to familiarize you with the
proper installation, configuration and operation of the SBX-4 beacon receiver module and to
introduce you the mechanical, electrical and communication properties of this OEM receiver.
This document provides instructions and recommendations related to a successful integration of
the SBX-4 engine.
The SBX-4 is an extremely sensitive 300 kHz minimum shift keying (MSK) demodulator. It obtains
differential GPS corrections broadcast by radio beacons adhering to standards such as
International Telecommunications Union M.823 and various broadcast standards in the frequency
range of 283.5 to 325.0 kHz.
This document is intended to assist a systems designer with the integration of the SBX-4.
Successful integration of this module within a system will require significant electronics expertise,
such as power supply design, serial port level translation, reasonable radio frequency
competency, an understanding of electromagnetic compatibility and circuit design and layout.
The SBX-4 engine is a low-level module intended for custom integration with the following
general integration requirements:
 Regulated power supply input (3.3 VDC +/- 3%) and 70 mA continuous
 Low-level serial port communications (3.3 V CMOS)
 The beacon antenna is powered with a separate regulated voltage source of 5 VDC
 The antenna input impedance is 50 ohms
The chapters that follow provide detailed information on the SBX-4 module, including the
hardware and software interface, in addition to various descriptions of technologies and features
that it supports.
Some notable features of the SBX-4 module are:
 Dual channel tracking for increased robustness
 Dual serial ports accommodate both NMEA and RTCM communications
 Certified IEC 61108-4 compliant
 Patented ceramic filter blocks out-of-band signals, optimizing reception
 Low power and lock status LEDs permit visual verification of receiver status
 Reverse compatibility ensures operation in existing SBX-2 and SBX-3 integrations
 Boot loader for firmware upgrade reliability

SBX-4 Integrator Guide Chapter 2
–
Integrating the SBX-4 Page 3 of 22
Chapter 2: Integrating the SBX-4
Mechanical Layout
LED Indicators
SBX-4 Block Diagram
SBX-4 Connector Pin Assignments
Signal Lock Indicator Pin
Reset Pin
Antenna Interface
Radio Frequency Immunity and Emissions
SBX-4 Dual Serial Port Overview
Factory Default Settings
SBX-4 Integration Summary

SB
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-4 Integrator Guide Chapter 2-Integrating the SB
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Chapter 2: Integrating the SBX-4 OEM Board
Mechanical Layout
Figures 1-1 to 1-3 provide the physical layout of the SBX-4 beacon receiver, including dimensions
and key components.
Note: Figure 1-1 to Figure1-3 dimensions are in inches.
Figure 1-1: Top-side view of SBX-4

SB
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Figure 1-2: SBX-4 bottom view

SB
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Figure 1-3: SBX-4 side view