Trimble BD910 User Manual

USER GUIDE

Trimble BD910

GNSS Receiver Module

Version 4.82
Revision A
November 2013

1

Corporate Office

Trimble Navigation Limited
IntegratedTechnologies
510 DeGuigne Drive
Sunnyvale, CA 94085
USA

www.trimble.com/gnss-inertial

Email: [e-mail]

Legal Notices

© 2006–2013, TrimbleNavigationLimited. All rightsreserved.
Trimble andtheGlobe & Triangle logo aretrademarks of Trimble
NavigationLimited, registeredinthe UnitedStates and inother
countries. CMR+, EVEREST, Maxwell, and Zephyr are trademarks of
Trimble Navigation Limited.
Microsoft,InternetExplorer,Windows,and Windows Vista are either
registered trademarks ortrademarks ofMicrosoft Corporationin the
United Statesand/orothercountries.
All othertrademarks are the property of theirrespective owners.
Support for Galileo is developed under a license oftheEuropean Union
and the European Space Agency
(BD910/BD920/BD930/BD970/BD982/BX982).

Release Notice

This is the November 2013 release (RevisionA) of theBD910GNSS
ReceiverModuleUser Guide. It applies to version 4.82 of thereceiver
firmware.

LIMITED WARRANTY TERMS AND CONDITIONS

Product Li mited Warranty

Subjecttothe following terms andconditions, TrimbleNavigation
Limited (“Trimble”)warrants that for a period of one(1) year from date
of purchase (exceptthe BD970 which is warrantedfor18 months),this
Trimble product (the “Product”) will substantially conformto Trimble's
publicly available specifications for the Product andthatthe hardware
and any storage media components ofthe Product will be substantially
free from defects in materials andworkmanship.

Product Software

Productsoftware, whetherbuilt into hardwarecircuitry as firmware,
provided as a standalone computersoftware product,embeddedin flash
memory,orstoredonmagnetic or othermedia,is licensed solely for use
withoras anintegralpartof the Product andis not sold. If accompanied
by a separate enduser licenseagreement (“EULA”),use ofany such
software will be subject to the terms of suchenduser license agreement
(includingany differing limitedwarranty terms, exclusions, and
limitations), which shall control overthe terms and conditions set forthin
thislimited warranty.

Software Fixes

During the limitedwarranty period you will be entitledtoreceive such
Fixes to the Product software that Trimble releases andmakes
commercially available and forwhich it does not charge separately,
subject to the procedures for delivery topurchasers of Trimble products
generally. If you have purchased the Productfrom an authorized
Trimble dealer ratherthan from Trimbledirectly, Trimblemay, atits
option,forward the software Fixto the Trimbledealer for final
distributionto you. MinorUpdates, MajorUpgrades, new products, or
substantially new software releases, as identified by Trimble, are
expressly excluded from this update process and limitedwarranty.
Receipt of software Fixesor otherenhancements shall not serve to
extendthelimited warranty period.
For purposes ofthiswarranty thefollowing definitions shall apply: (1)
“Fix(es)” means an errorcorrectionorotherupdate created to fix a
previous software version that does not substantially conform to its
Trimble specifications; (2)“MinorUpdate” occurs when enhancements
are made tocurrentfeaturesin a software program; and(3) “Major
Upgrade”occurs when significantnew features areadded to software,
orwhen a newproductcontaining new features replaces the further
developmentof a currentproductline. Trimble reserves therightto
determine,in its sole discretion,what constitutes a Fix,MinorUpdate, or
Major Upgrade.

Warranty Remedies

If theTrimble Product fails during the warranty periodforreasons
coveredby this limitedwarranty and you notify Trimble of suchfailure
during the warranty period,Trimble will repairOR replace the
nonconforming Productwith new, equivalent to new, or reconditioned
partsorProduct,OR refundthe Product purchase price paid by you,at
Trimble’s option, uponyour return of theProductin accordance with
Trimble's product returnprocedures then in effect.

How to Obtain Warranty Service

To obtain warranty service for the Product, please contactyour local
Trimble authorized dealer. Alternatively, youmay contactTrimble to
request warranty service by e-mailing yourrequest to

[e-mail]. Please beprepared to provide:

– yourname, address,and telephone numbers
– proof of purchase
– a copy of this Trimble warranty
– a descriptionof the nonconforming Productincluding themodel
number
– an explanation of the problem
The customerservice representative may needadditionalinformation
fromyou depending on the nature of the problem.

Warranty Exclusions or Di sclaimer

This Product limitedwarranty shallonly apply inthe event andtothe
extentthat (a) the Product is properly and correctly installed,configured,
interfaced,maintained, stored, and operated in accordancewith
Trimble's applicable operator's manual andspecifications, and; (b) the
Productis not modifiedormisused. This Productlimited warranty shall
notapply to, and Trimble shall not be responsible for, defects or
performance problems resulting from (i)thecombinationorutilizationof
theProduct withhardware orsoftware products,information,data,
systems, interfaces,ordevices not made, supplied,or specified by
Trimble; (ii) the operationof theProductunderany specification other
than,or inadditionto,Trimble's standard specifications for its products;
(iii) the unauthorized installation,modification, or use ofthe Product; (iv)
damage causedby: accident, lightning orotherelectrical discharge,fresh
orsalt water immersionorspray (outsideof Productspecifications); or
exposure to environmentalconditions forwhich the Product is not
intended; (v) normal wear andtear on consumable parts (e.g.,
batteries); or(vi) cosmeticdamage. Trimbledoes not warrantor
guarantee the resultsobtained throughthe use ofthe Product,orthat
software components will operate errorfree.

NOTICE REGARDING PRODUCTS EQUIP PED WITH TECHNOLOGY CAPABLE OF
TRACKING SATELLITE SIGNALS FROM SATELLITE BASED AUGMENTATION
SYSTEMS (SBAS) (WAAS/EGNOS, AND MSAS), OMNISTAR, GPS, MODERNIZED
GPS OR GLONASS SATELLITES, O R FROM IALA BEACON SOURCES: TRIMBLE IS

NOT R ESPONSIBL E FOR THE OPERATION O R FAILU RE OF O PERATION O F ANY

SATELLITE BASED POSITIONING SYSTEM OR THE AVAILABILITY O F ANY
SATELLITE BASED POSITIONING SIGNALS.

THE FOREGOING LIMITED WARRANTY TERMS STATE TRIMBLE’S ENTIRE LIABILITY,AND
YOUR EXCLUSIVE REMEDIES, RELATING TO THE TRIMBLE PRODUCT. EXCEPT AS
OTHERWISE EXPRESSLY PROVIDED HEREIN,THE PRODUCT,AND ACCOMPANYING
DOCUMENTATION AND MATERIALS ARE PROVIDED “AS-IS” AND WITHOUT EXPRESS
OR IMPLIED WARRANTY OF ANY KIND,BY EITHER TRIMBLE OR ANYONE WHO HAS BEEN
INVOLVED IN ITS CREATION,PRODUCTION,INSTALLATION,OR DISTRIBUTION,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
AND FITNESS FOR A PARTICULAR PURPOSE,TITLE,AND NONINFRINGEMENT. THE
STATED EXPRESS WARRANTIES ARE IN LIEU OF ALL OBLIGATIONS OR LIABILITIES ON
THE PART OF TRIMBLE ARISING OUT OF,OR IN CONNECTION WITH, ANY PRODUCT.
BECAUSE SOME STATES AND JURISDICTIONS DO NOT ALLOW LIMITATIONS ON
DURATION OR THE EXCLUSION OF AN IMPLIED WARRANTY, THE ABOVE LIMITATION
MAY NOT APPLY ORFULLY APPLY TO YOU.

Lim itation of Liability

TRIMBLE'S ENTIRE LIABILITY UNDER ANY PROVISION HEREINSHALL BE LIMITED TO THE
AMOUNT PAID BY YOU FOR THE PRODUCT. TO THE MAXIMUM EXTENT PERMITTED BY
APPLICABLE LAW, IN NOEVENT SHALL TRIMBLE OR ITS SUPPLIERS BE LIABLE FOR ANY
INDIRECT,SPECIAL,INCIDENTAL,OR CONSEQUENTIAL DAMAGE WHATSOEVER UNDER
ANY CIRCUMSTANCE ORLEGAL THEORY RELATING IN ANYWAY TO THE PRODUCTS,
SOFTWARE AND ACCOMPANYING DOCUMENTATION AND MATERIALS, (INCLUDING,
WITHOUT LIMITATION, DA MAGES FOR LOSS OF BUSINESS PROFITS, BUSINESS
INTERRUPTION, LOSS OF DATA, OR ANY OTHER PECUNIARY LOSS),REGARDLESS OF
WHETHER TRIMBLE HA S BEEN ADVISED OF THE POSSIBILITY OF ANY SUCH LOSS AND
REGARDLESS OF THE COURSE OF DEA LING WHICH DEVELOPS OR HAS DEVELOPED
BETWEEN YOU AND TRIMBLE. BECAUSE SOME STATES AND JURISDICTIONS DO NOT

2 BD910 GNSS Receiver Module User Guide

ALLOW THE EXCLUSION OR LIMITA TION OF LIABILITY FOR CONSEQUENTIAL OR
INCIDENTAL DAMAGES, THE ABOVE LIMITATION MAY NOT APPLY ORFULLY APPLY TO
YOU.

PLEASE N OTE: THE ABOVE TRIMBLE LIMITED WARRANTY PROVISIONS WILL
NOT AP PLY TO P RODUC TS PUR CHASED IN THOSE JURISDICTIONS (E.G.,
MEMBER STATES OF THE EURO PEAN EC ONOMIC AREA) IN W HICH PRODUC T
WARRANTIES ARE THE RESPON SIBILITY OF THE LOCAL TRIMBLE AUTHORIZED
DEALER FROM WHOM THE PRODUC TS ARE ACQU IRED. IN SUC H A CASE,
PLEASE C ONTACT YOU R LOCAL TRIMBLE AU THORIZED DEALER FO R
APPL ICABLE W ARRANTY INFORMATION.

Official Language

THE OFFICIAL LANGUAGE OF THESE TERMS AND CONDITIONS IS ENGLISH. IN THE
EVENT OF A CONFLICT BETWEEN ENGLISH AND OTHER LANGUAGE V ERSIONS, THE
ENGLISH LANGUAGE SHALL CONTROL.

COCOM limits

This noticeappliesto the BD910,BD920,BD930, BD960,BD970,BD982,
BX960,BX960-2,and BX982 receivers.
The U.S. Department of Commerce requires that allexportableGPS
productscontain performance limitations so thatthey cannot be usedin
a mannerthat could threatenthesecurity ofthe UnitedStates. The
following limitations are implementedon this product:
– Immediate access tosatellite measurements andnavigation results is
disabledwhenthe receivervelocity is computed to be greaterthan
1,000knots,orits altitude iscomputed to be above 18,000 meters. The
receiver GPS subsystem resets untilthe COCOM situation clears. As a
result, all logging and stream configurations stop untiltheGPS
subsystem is cleared.

Restriction of Use of Certain Hazardous Substances in Electrical

and Electronic Equipment (RoHS)

Trimble products in this guide comply inall materialrespects with
DIRECTIVE 2002/95/EC OF THE EUROPEAN PARLIAMENT AND OF THE
COUNCIL of27 January 2003 on the restrictionof the use of certain
hazardous substances in electrical andelectronicequipment (RoHS
Directive) andAmendment2005/618/EC filed under C(2005) 3143, with
exemptions for lead insolder pursuanttoParagraph 7 ofthe Annex to
theRoHS Directive applied.

Waste Electrical and Electronic Equipment (WEEE)

For product recycling instructions andmore information,
please go to www.trimble.com/ev.shtml.
Recycling inEurope: To recycle TrimbleWEEE (Waste
Electrical and Electronic Equipment,products that run on
electricalpower.), Call+31 497 53 24 30, andask forthe
“WEEE Associate”. Or,mail a requestforrecycling
instructions to:
Trimble Europe BV
c/o MenloWorldwideLogistics
Meerheide45
5521 DZ Eersel,NL

BD910 GNSS Receiver Module User Guide 3

Contents

1 Introduction 6

About the BD910GNSS receiver 7
BD910features 8
Default settings 10
Technicalsupport 10

2 Specifications 11

Positioning specifications 12
Performance specifications 12
Physical and electrical characteristics 13
Environmental specifications 13
Communication specifications 14

3 Electrical System Integration 15

80-pin header connector pinouts 16
1PPS and ASCII time tag 21
ASCII time tag 22
Power input 23
Antenna poweroutput 23
LED control lines 24
Power switch and reset 25
Event 26
Serial port 27
USB 27
Ethernet 28

Isolation transformer selection 28
Ethernet reference design 28
Ethernet design using RJ-45 with integrated magnetics 29
Electrical characteristics 30
Ethernet design using discrete components 30
Ethernet routing 31

Recommended electrical specifications for the antenna 33

4 Mechanical Drawings 34

BD910module mechanical drawing 35
BD910evaluation I/O board 36

Antenna jumper setting 36

BD910PCB assembly schematics 38

PCB layout recommendations 38
PCB assembly recommendations 38

5 Installation 40

BD910 GNSS Receiver Module User Guide 4

Contents

Unpacking and inspecting the shipment 41

Shipment carton contents 41
Reporting shipping problems 41

Installation guidelines 41

Considering environmental conditions 41
Supported antennas 41
Mounting the antennas 42

Sources of electricalinterference 42
Interface board evaluation kit 43
Routing and connecting the antenna cable 44
LED functionality and operation 46

Troubleshooting receiver issues 47

Glossary 49

BD910 GNSS Receiver Module User Guide 5

Introduction

1

In this chapter:

n

About the BD910GNSS receiver

n

BD910features

n

Default settings

n

Technicalsupport

This manual describes how to set up and use the
Trimble BD910 GNSS receiver module. The BD910
receiver uses advanced navigation architecture to
achieve real-time centimeteraccuracies with
minimal latencies.

Even if you have used other GNSS or GPS products
before, Trimble recommends that you spend
some time reading this manual to learn about the
special features of this product. If you are not
familiar with GNSS or GPS, visit the Trimble website
(www.trimble.com).

BD910 GNSS Receiver Module User Guide 6

1 Introduction

About the BD910 GNSS receiver

The receiver is used for a wide range of precise positioning and navigation applications. These uses
include unmanned vehicles and port and terminal equipment automation, and any other
application requiring reliable, centimeter-level positioning at a high update rate and low latency.

The receiver offers centimeter-levelaccuracy based on carrier phase RTK and submeter accuracy
code-based solutions.

Automatic initialization and switching between positioning modes allowfor the best position
solutions possible. Low latency (less than 30 msec)and high update rates give the response time
and accuracy required for precise dynamic applications.

You can configure the receiver as an autonomous base station (sometimes called a reference
station) or as a rover receiver (sometimes called a mobilereceiver). Streamed outputs from the
receiver provide detailed information, including the time, position, heading, quality assurance
(figure of merit) numbers, and the number of tracked satellites. The receiver also outputs a one
pulse per second (1 PPS) strobe signal which lets remote devices precisely synchronize time.

Designed for reliable operation in all environments, the receiver provides a positioning interface to
an officecomputer, external processing device, or control system. The receiver can be controlled
through a serial, ethernet, or USB port using binary interface commands or the web interface.

BD910 GNSS Receiver Module User Guide 7

1 Introduction

BD910 features

The receiver has the following features:

l

Position antenna based a on 220-channel Trimble Maxwell™6 chip:

ll

GPS: L1 C/A

l

GLONASS: L1 C/A

l

Galileo: E1

l

BeiDou: B1

l

QZSS: L1 C/A, L1 SAIF

l

SBAS: L1 C/A

l

Advanced Trimble Maxwell6 Custom Survey GNSS Technology

l

Very low noise GNSS carrierphase measurements with <1 mm precision in a 1 Hz bandwidth

l

Proven Trimble low elevation tracking technology

l

1 USB port (device only)

l

1 LANEthernet port:

ll

Supports links to 10BaseT/100BaseT networks

l

Allfunctions are performed through a single IP address simultaneously—including web
interface access and raw data streaming

l

Network Protocols supported:

ll

HTTP (web GUI)

l

NTP Server

l

NMEA, GSOF, CMR, and so on over TCP/IP or UDP

l

NTripCaster, NTripServer, NTripClient

l

mDNS/UPnP Service discovery

l

Dynamic DNS

l

Email alerts

l

Network link to Google Earth

l

Support for external modems through PPP

l

4 x RS-232 ports (baud rates up to 460,800)

l

1 Hz, 2 Hz, 5 Hz, 10 Hz, and 20 Hz positioning and heading outputs (depending on the installed
option)

l

Up to 20 Hz raw measurement and position outputs

BD910 GNSS Receiver Module User Guide 8

1 Introduction

l

Correction inputs/outputs: CMR, CMR+™, sCMRx, RTCM 2.1, 2.2, 2.3, 3.0. Note:

ll

The functionality to input or output any of these corrections depends on the installed
options.

l

Different manufacturers may have established different packet structures for their
correction messages. Thus, the BD9xx receivers may not receive corrections from other
manufacturers receivers, and other manufacturers receivers may not be able to receive
corrections from BD9xx receivers.

l

Navigation outputs:

ll

ASCII: NMEA-0183: GBS; GGA; GLL; GNS; GRS; GSA; GST; GSV; HDT; LLQ; PFUGDP; DTM;
PTNL,AVR; PTNL,BPQ; PTNL,GGK; PTNL,PJK; PTNL,PJT; PTNL,VGK; PTNL,VHD; RMC; ROT;
VTG; ZDA.

l

Binary: Trimble GSOF.

l

Control software: HTML Web browser (Google Chrome (recommended), Internet Explorer®,
Mozilla Firefox, Apple Safari, Opera)

l

1 Pulse Per Second Output

l

Event Marker Input Support

l

LED drive support

l

Supports Fault Detection and Exclusion (FDE), Receiver Autonomous Integrity Monitoring
(RAIM)

Note – Galileo support is developed under a license of the European Union and the European
Space Agency.

Note – At the time of this publication, no public BeiDou ICD was available. The current capability in
the receiver is based on publicly available information. As such, Trimble cannot guarantee that
these receivers will be fully compatible with a future generation of BeiDou satellites or signals.

BD910 GNSS Receiver Module User Guide 9

1 Introduction

Default settings

Allsettings are stored in application files. The default application file, Default.cfg, is stored
permanently in the receiver, and contains the factory default settings. Whenever the receiver is
reset to its factory defaults, the current settings (stored in the current application file, Current.cfg)
are reset to the values in the default application file.

These settings are defined in the default application file.

Function Settings Factory default

SV Enable - AllSVs enabled
GeneralControls Elevation mask 10°

PDOP mask 99
RTK positioning mode Low Latency
Motion Kinematic

Ports Baud rate 38,400

Format 8-None-1

Flow control None
Input Setup Station Any
NMEA/ASCII (all supported messages) Allports Off
Streamed Output All types Off

Offset=00
RT17/Binary Allports Off
Reference Position Latitude 0°

Longitude 0°
Altitude 0.00m HAE

Antenna Type Unknown

Height (true vertical) 0.00m
Measurement method Antenna Phase Center

1PPS Disabled

Technical support

If you have a problem and cannot find the information you need in the product documentation,
send an email to [e-mail].

Documentation, firmware, and software updates are available at: www.trimble.com/gnss-

inertial/GNSS-Positioning-and-Heading-Systems.aspx.

BD910 GNSS Receiver Module User Guide 10

Specifications

2

In this chapter:

n

Positioning specifications

n

Performance specifications

n

Physical and electrical characteristics

n

Environmental specifications

n

Communication specifications

This chapter details the specifications for the
receiver.

Specifications are subject to change without
notice.

BD910 GNSS Receiver Module User Guide 11

2 Specifications

Positioning specifications

Note – The following specifications are provided at 1 sigma level when using a Trimble Zephyr 2
antenna. These specifications may be affected by atmospheric conditions, signal multipath, and
satellite geometry. Initialization reliability is continuously monitored to ensure highest quality.

Feature Specification

Initialization time Typically <1 minute
Initialization accuracy >99.9%

Mode Accuracy Latency (at max. output rate) Maximum Rate

Single Baseline RTK
(<5km)

0.008 m + 1 ppm horizontal <30ms 20 Hz

0.15m + 1 ppm vertical

DGPS 0.25 m + 1 ppm horizontal <20ms 20 Hz

0.5 m + 1 ppm vertical

1

SBAS

0.5 m horizontal <20ms 20 Hz

0.85m vertical

Performance specifications

Note – The Time to First Fix specifications are typical observed values. A cold start is when the
receiver has no previous satellite (ephemerides/almanac) or position (approximate position or
time) information. A warm start is when the ephemerides and last used position is known.

Feature Specification

Time to First Fix (TFF) Cold Start <45seconds

Warm Start <30seconds
Signal Re-acquisition <2 seconds

Velocity Accuracy

Maximum Operating Limits

Acceleration 11g

2

Horizontal 0.007 m/sec
Vertical 0.020 m/sec

3

Velocity 515m/sec
Altitude 18,000 m

1

GPS only and depends on SBAS system performance. FAA WAASaccuracy specifications are <5m 3DRMS.

2

1 sigma level when using a Trimble Zephyr 2 antenna. These specifications may be affected by atmospheric conditions, signal multipath, and satellite

geometry.Initialization reliabilityis continuously monitored to ensure highest quality.

3

As required by the US Department of Commerce to comply with export licensing restrictions.

BD910 GNSS Receiver Module User Guide 12

2 Specifications

Physical and electrical characteristics

Feature Specification

Dimensions (L x W x H) 41 mm x 41 mm x 7 mm
Power 3.3 V DC +5%/-3%

Typical 1.1 W (L1GPS + L1 GLONASS)
Weight 19 grams
Connectors I/O: 80-pin Narrow Pitch Panasonic (AXK780327G) Socket Panasonic

AXK880125WG required mating connector (Rated 50 cycles)

Antenna: MMCX receptacle(Rated for 500 cycles)
Antenna LNA Power Output Output voltage: 3.3 to 5 V DC

Current rating: 200mA
Maximum current: 400mA

Minimum required LNAgain 24.5dB

Environmental specifications

Feature Specification

Temperature Operating: -40°C to 85°C (-40°F to 185°F)

Storage: -55°C to 85°C (-67°F to 185°F)

Vibration MIL810F, tailored

Random 6.2 gRMS operating
Random 8 gRMS survival

Mechanical shock MIL810D

+/- 40g operating
+/- 75g survival

Operating humidity 5% to 95%R.H. non-condensing, at +60°C (140°F)

BD910 GNSS Receiver Module User Guide 13

2 Specifications

Communication specifications

Feature Specification

l

Communications 1 LANport

4 x RS-232 ports Baud rates up to 460,800

1 USB 2.0 port
Receiver position update rate 1 Hz, 2 Hz, 5 Hz, 10 Hz, and 20 Hz positioning
Correction data input CMR, CMR+™, sCMRx, RTCM 2.0–2.3, RTCM 3.0, 3.1
Correction data output CMR, CMR+, sCMRx, RTCM 2.0 DGPS (select RTCM 2.1), RTCM 2.1–

2.3, RTCM 3.0

Data outputs 1PPS, NMEA, Binary GSOF, ASCIITime Tags

Supports links to 10BaseT/100BaseT
networks.

l

Allfunctions are performed through a single
IPaddress simultaneously – including web
interface access and data streaming.

BD910 GNSS Receiver Module User Guide 14

Electrical System Integration

In this chapter:

n

80-pin header connector pinouts

n

1PPS and ASCII time tag

n

ASCII time tag

n

Power input

n

Antenna poweroutput

n

LED control lines

3

n

Power switch and reset

n

Event

n

Serial port

n

USB

n

Ethernet

n

Recommended electrical specifications for
the antenna

BD910 GNSS Receiver Module User Guide 15

3 Electrical System Integration

80-pin header connector pinouts

The 80-pin Narrow Pitch Panasonic Socket has the following pinouts.

Pin Signal name Description Integration notes

1 VCC Input DC Card

power

2 VCC Input DC Card

power

3 ANTENNA_POWER VCC Input DC Card power

4 Power LED POWER Indicator. High when

5 RESET_IN RESET_IN - ground to reset Drive low to reset the unit. Otherwise, leave

6 RTK LED RTK LED. Flashes when an

7 GND Ground Digital Ground Ground Digital Ground
8 Satellite Satellite LED. Rapid flash

9 NO_CONNECT RESERVED For proper operation of the receiver, do not

10 NO_CONNECT RESERVED For proper operation of the receiver, do not

VCC Input DC Card power
(3.3V only)

VCC Input DC Card power
(3.3V only)

(3.3V to 5V)

unit is on, low when off. This
is similar to all BD9xx
products, except for the
requirement for an external
resistor. This allows user to
use this as a control line.

RTK correction is present.
This is similar to all BD9xx
products, except for the
requirement for an external
resistor.

indicates <5 satellites. Slow
flash indicates >5 satellites.

VCC Input DC Card power (3.3V only)

VCC Input DC Card power (3.3V only)

This feeds antenna power. Voltage and
current requirement based on antenna
voltage used. Ripple Voltage should be
100mV Vpp or better. This can be shorted
directly to 3.3V used to supply power to the
unit if the antenna can handle 3.3V. It can
handle a maximum current of 400 mA.

When used to drive an LED, a series resistor
with a typical value of 300 Ohms is required.
This pin supplies a maximum current of 4mA.
For LEDs with Vfabove 2.7 or current excess
of 4mA, an external buffer is required.

unconnected.
When used to drive an LED, a series resistor

with a typical value of 300 Ohms is required.
This pin supplies a maximum current of 4mA.
For LEDs with Vfabove 2.7 or current excess
of 4mA, an external buffer is required.

When used to drive an LED, a series resistor
with a typical value of 300 Ohms is required.
This pin supplies a maximum current of 4mA.
For LEDs with Vfabove 2.7 or current excess
of 4mA, an external buffer is required.

connect anything to this pin. This pin can be
left floating since the receiver does not
support USB in a host mode.

connect anything to this pin. Reserved for
internal use.

BD910 GNSS Receiver Module User Guide 16

3 Electrical System Integration

Pin Signal name Description Integration notes

11 NO_CONNECT RESERVED For proper operation of the receiver, do not

connect anything to this pin. Reserved for
internal use.

12 NO_CONNECT RESERVED For proper operation of the receiver, do not

connect anything to this pin. Reserved for
internal use.

13 BOOT_MONITOR* Boot to Monitor pin. This

prevents the unit from
executing the application

Drive the pin low at boot up to force the
receiver into monitor mode.

Do not connect for normal operation.

firmware.

14 NO_CONNECT RESERVED For proper operation of the receiver, do not

connect anything to this pin. Reserved for
internal use.

15 NO_CONNECT RESERVED For proper operation of the receiver, do not

connect anything to this pin. Reserved for
internal use.

16 NO_CONNECT RESERVED For proper operation of the receiver, do not

connect anything to this pin. Reserved for

internal use.
17 GND Ground DigitalGround Ground Digital Ground
18 COM2_Rx COM 2 Receive Data - TTL

Level

Connect COM2_RX to a transceiver if RS-232

levelis required.

Note – This pin is connected to two physical pins.

19 COM2_CTS COM 2 Clear to Send - TTL

Level

20 COM2_Tx COM 2 Transmit Data - TTL

Level

Connect COM2_CTS to a transceiver if RS-232

levelis required.

Note – This pin is connected to two physical pins.

Connect COM2_TX to a transceiver if RS-232

levelis required.
21 COM2_RTS COM 2 Request to Send Request to Send for COM 2 connect to a

transceiver if RS-232 level is required.
22 COM1_Tx COM 1 Transmit Data – TTL

Level

Connect COM1_TX to a transceiver if RS-232

levelis required.
23 GND Ground DigitalGround Ground Digital Ground
24 COM1_Rx COM 1 Receive Data – TTL

Level

25 USB D (-) USB D (-)Bi-directional USB

interface data (-)

Connect COM1_RX to a transceiver if RS-232

levelis required.

Device Mode only. If VCC is supplied, USB

detects VBUS.
26 GND Ground DigitalGround Ground Digital Ground
27 USB D (+) USB D (+) Bi-directional USB

interface data (+)

Device Mode only. If VCC is supplied, USB

detects VBUS.

BD910 GNSS Receiver Module User Guide 17