Trimble AgGPS 114 User Manual

AgG

PS® 114 Receiver

User Guide

F

Firmware Version 1.70

Part Number 38201-10-ENG

Revision A

January 2003

Agriculture Division

Trimble Navigation Limited
Agriculture Division
9290 Bond Street, Suite 102
Overland Park, KS 66214
U.S.A

www.trimble.com

Phone: [phone]
E-mail: [e-mail]

Copyright and Trademarks

© 2000-2003, Trimble Navigatio n Limited. All rights
reserved.

The Sextant logo with Trimble, Trimble, and AgGPS are
a trademarks of Trimble Navigation Limited, registered
in the United States Patent and Trademark.

The Globe & Triangle logo, 4000RSi, EVEREST,
FlightBar, The Choice, a nd TrimFl ight are trademarks of
Trimble Navigation Limited.

All other trademarks are the property of their respective
owners.

Printed in the United States of America. Printed on
recycled paper.

Release Notice

This is the <Month> 2002 release (Revision **) of the
AgGPS 114 Receiver User Guide, part nu mber 38201­10-ENG. It applies to version 1.70 of the AgGPS 114
receiver firmware.

The following limited warranties give you specific legal
rights. You may have others, which vary from
state/jurisdiction to state/jurisdiction.

Hardware Limited Warranty

Trimble Navigation Limited warrants that this hardware
product (the “Product”) will perform substantially in
accordance with published specifications and be
substantially free of defects in material and
workmanship for a period of one (1) year starting from
the date of delivery. The warranty set forth in this
paragraph shall not apply to software products.

Software License, Limited Warranty

This Trimble software product, wh ether provided as a
stand-alone computer software product, built into
hardware circuitry as firmware, embedded in flash
memory, or stored on magnetic or other media, (the
“Software”) is licensed and not sold, and its use is
governed by the terms of the relevant End User License
Agreement (“EULA”) included with the Software. In the
absence of a separate EULA included with the Software
providing different limited warranty terms, exclusions
and limitations, the following terms and conditions shall
apply. Trimble warrants that this Trimble Software
product will substantially conform to Trimble’s

applicable published specifications for the Software for
a period of ninety (90) days, starting from the date of
delivery.

Warranty Remedies

Trimble's sole liability and your exclusive remedy under
the warranties set forth above shall be, at Trimble’s
option, to repair or replace any Product or Software that
fails to conform to such warranty ("Nonconforming
Product") or refund the purchase price paid by you for
any such Nonconforming Product, upon you r return of
any Nonconforming Product to T r imble in accordance
with Trimble’s standard return material authorization
procedures.

Warranty Exclusions and Disclaimer

These warranties shall be applied only in the event and
to the extent that the Products and Software are properly
and correctly installed, configured, interfaced,
maintained, stored, and operated in accordance with
Trimble's relevant operator's manual and specifications,
and; (ii) the Products and Software are not modified or
misused. The preceding warranties shall not apply to,
and Trimble shall not be responsib l e for defects or
performance problems resulting from (i) the
combination or utilization of the Product or Software
with hardware or software products, information, data,
systems, interfacing or devices not made, supplied or
specified by Trimble; (ii) the op eration of th e Produc t or
Software under any specification other than, or in
addition to, Trimble's standard specifications for its
products; (iii) the unauthorized modification or use of
the Product or Software; (iv) damage caused by
accident, lightning or other electrical discha rge, fresh or
salt water immersion or spray; or (v) normal wear and
tear on consumable parts (e.g., batteries). Trimble does
not warrant or guarantee the results obtained through the
use of the Product.

THE WARRANTIES ABOVE STATE TRIMBLE'S ENTIRE
LIABILITY, AND YOUR EXCLUSIVE REMEDIES,
RELATING TO PERFORMANCE OF THE PRODUCTS
AND SOFTWARE. EXCEPT AS OTHERWISE
EXPRESSLY PROVIDED HEREIN, THE PRODUCTS,
SOFTWARE, AND ACCOMPANYING
DOCUMENTATION AND MATERIALS ARE PROVIDED

“

AS-IS” AND WITHOUT EXPRESS OR IMPLIED
WARRANTY OF ANY KIND BY EITHER TRIMBLE
NAVIGATION LIMITED 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 PRODUCTS
OR SOFTWARE. SOME STATES AND JURISDICTIONS

DO NOT ALLOW LIMITATIONS ON DURATION OR
THE EXCLUSION OF AN IMPLIED WARRANTY, SO
THE ABOVE LIMITATION MAY NOT APPLY TO YOU.

TRIMBLE NAVIGATION LIMITED IS NOT
RESPONSIBLE FOR THE OPERATION OR
F AILURE OF OPERATION OF GPS SATELLITES OR
THE AVAILABILITY OF GPS SATELLITE
SIGNALS.

Limitation of Liability

TRIMBLE’S ENTIRE LIABILITY UNDER ANY
PROVISION HEREIN SHALL BE LIMITED TO THE
AMOUNT PAID BY YOU FOR THE PRODUCT OR
SOFTWARE LICENSE. TO THE MAXIMUM EXTENT
PERMITTED BY APPLICABLE LAW, IN NO EVENT
SHALL TRIMBLE OR ITS SUPPLIERS BE LIABLE FOR
ANY INDIRECT, SPECIAL, INCIDENTAL OR
CONSEQUENTIAL DAMAGES WHATSOEVER UNDER
ANY CIRCUMSTANCE OR LEGAL THEORY RELATING
IN ANY WAY TO THE PRODUCTS, SOFTWARE AND
ACCOMPANYING DOCUMENTATION AND
MATERIALS, (INCLUDING, WITHOUT LIMITATION,
DAMAGES FOR LOSS OF BUSINESS PROFITS,
BUSINESS INTERRUPTION, LOSS OF BUSINESS
INFORMATION, OR ANY OTHER PECUNIARY LOSS),
REGARDLESS WHETHER TRIMBLE HAS BEEN
ADVISED OF THE POSSIBILITY OF ANY SUCH LOSS
AND REGARDLESS OF THE COURSE OF DEALING
WHICH DEVELOPS OR HAS DEVELOPED BETWEEN
YOU AND TRIMBLE. BECAUSE SOME STATES AND
JURISDICTIONS DO NOT ALLOW THE EXCLUSION OR
LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR
INCIDENTAL DAMAGES, THE ABOVE LIMITATION
MAY NOT APPLY TO YOU.

NOT WITHSTANDING THE ABOVE, IF YOU
PURCHASED THIS PRODUCT OR SOFTWARE IN
THE EUROPEAN UNION, THE ABOVE
WARRANTY PROVISIONS MAY NOT APPLY.
PLEASE CONTACT YOUR DEALER FOR
APPLICABLE WARRANTY INFORMATION.

Notices

Class B Statement – Notice to Users. This equipment
has been tested and found to comply with the limits for a
Class B digital device, pursuant to Part 15 of the FCC
rules. These limits are designed to provide reasonable
protection against harmful interference in a residential
installation. This equipment generates, uses, and can
radiate radio frequency energy and, if not installed and
used in accordance with the instructions, may cause
harmful interference to radio communication. However,
there is no guarantee that interference will not occur in a
particular installation. If this equipment does cause
harmful interference to radio or television reception,
which can be determined by turning the equipmen t off
and on, the user is encouraged to try to correct the
interference by one or more of the following measures:

– Reorient or relocate the receiving antenna.
– Increase the separation between the equipment and

the receiver.

– Connect the equipment into an outlet on a circuit

different from that to which the receiver is connected.

– Consult the dealer or an experienced radio/TV

technician for help.

Changes and modifications not expressly approved by
the manufacturer or registrant of this equipment can
void your authority to operate this equipment under
Federal Communications Commission rules.

Contents

About This Manual

1Overview

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

The AgGPS 114 Receiver. . . . . . . . . . . . . . . . . . . . . . . . . 2

Standard features. . . . . . . . . . . . . . . . . . . . . . . . . . 3

Receiver enhancements . . . . . . . . . . . . . . . . . . . . . . 5

Application options . . . . . . . . . . . . . . . . . . . . . . . . 7

Receiver input / output . . . . . . . . . . . . . . . . . . . . . . 8

Differential GPS (DGPS) . . . . . . . . . . . . . . . . . . . . . . . . . 9

Sources of GPS error. . . . . . . . . . . . . . . . . . . . . . . 10

DGPS accuracy. . . . . . . . . . . . . . . . . . . . . . . . . . 11

Receiving satellite DGPS . . . . . . . . . . . . . . . . . . . . 13

2 Installing the Receiver

System Components . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Optional extras (if ordered) . . . . . . . . . . . . . . . . . . . 16

Mounting the Receiver . . . . . . . . . . . . . . . . . . . . . . . . . 18

Choosing a location . . . . . . . . . . . . . . . . . . . . . . . 18

Environmental conditions . . . . . . . . . . . . . . . . . . . . 20

Electrical interference . . . . . . . . . . . . . . . . . . . . . . 20

Connecting to an External Device . . . . . . . . . . . . . . . . . . . 21

Customized connections . . . . . . . . . . . . . . . . . . . . . 23

CASE-IH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Connecting the optional power/data cable . . . . . . . . . . . . 26

CASE-IH combines . . . . . . . . . . . . . . . . . . . . . . . 27

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GPS 1 14 Receiver User Guide v

Contents

John Deere GreenStar. . . . . . . . . . . . . . . . . . . . . . . . . . 30

Ag Leader . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

AGCO FieldStar . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

RDS Ceres Yield Monitor. . . . . . . . . . . . . . . . . . . . . . . . 45

RDS Pro Series 8000 Yield Monitor . . . . . . . . . . . . . . . . . . 45

Laptop Computer . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Connecting the receiver . . . . . . . . . . . . . . . . . . . . . 30

John Deere combines (00 and 10 Series) . . . . . . . . . . . . 30

John Deere combines (50 Series) . . . . . . . . . . . . . . . . 34

Connecting the optional data cable. . . . . . . . . . . . . . . . 39

Ag Leader PF3000 Pro. . . . . . . . . . . . . . . . . . . . . . 40

Locating the FieldStar ComUnit . . . . . . . . . . . . . . . . . 42

Connecting the receiver . . . . . . . . . . . . . . . . . . . . . 42

Configuring the receiver . . . . . . . . . . . . . . . . . . . . . 43

Configuring the FieldStar ComUnit . . . . . . . . . . . . . . . 43

Windows CE Palmtop. . . . . . . . . . . . . . . . . . . . . . . . . . 47

Windows Handheld Computer . . . . . . . . . . . . . . . . . . . . . 48

Micro-Trak Yield Monitor . . . . . . . . . . . . . . . . . . . . . . . 49

3 Getting Started

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Installing AgRemote . . . . . . . . . . . . . . . . . . . . . . . 53

The AgRemote Menu System. . . . . . . . . . . . . . . . . . . . . . 56

Using AgRemote . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

The AgRemote keys . . . . . . . . . . . . . . . . . . . . . . . 57

Navigating the Menus and Screens . . . . . . . . . . . . . . . . . . . 58

Menu System Fields . . . . . . . . . . . . . . . . . . . . . . . . . . 60

Display-only fields . . . . . . . . . . . . . . . . . . . . . . . . 60

Multiple-choice fields . . . . . . . . . . . . . . . . . . . . . . 60

Alpha, numeric, and alphanumeric fields . . . . . . . . . . . . 61

The Home Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

Satellite and WAAS/EGNOS DGPS mode . . . . . . . . . . . 63

Updating the Firmware . . . . . . . . . . . . . . . . . . . . . . . . . 66

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GPS 114 Receiver User Guide

4 Configuring the Receiver

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

Display Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

Configuring the Communication Ports . . . . . . . . . . . . . . . . . 72

Configuring input / output communication . . . . . . . . . . . 74

Configuring Differential GPS. . . . . . . . . . . . . . . . . . . . . . 78

Paid Subscription Services . . . . . . . . . . . . . . . . . . . . . . . 79

OmniSTAR. . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

Thales . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

WAAS/EGNOS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

Using an AgGPS 70 RDL to Activate the Lightbar. . . . . . . . . . . 86

5 Activating Firmware Options

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

Installing an Option . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

Contents

Enter a password . . . . . . . . . . . . . . . . . . . . . . . . . 88

FlashLoader100 . . . . . . . . . . . . . . . . . . . . . . . . . 89

Using an Option. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

Fast Rate Output . . . . . . . . . . . . . . . . . . . . . . . . . 90

Base Station . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

Waypoints option. . . . . . . . . . . . . . . . . . . . . . . . . 97

Point/Line/Area option. . . . . . . . . . . . . . . . . . . . . . 106

A Troubleshooting

Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116

Troubleshooting Guides. . . . . . . . . . . . . . . . . . . . . . . . . 122

System Hardware and Power Troubleshooting Guide . . . . . . . . . 123

GPS Reception (No Yield Monitor) Troubleshooting Guide . . . . . . 125

GPS Reception (With Yield Monitor) Troubleshooting Guide . . . . . 127

OmniSTAR Troubleshooting Guide . . . . . . . . . . . . . . . . . .129

Thales Troubleshooting Guide . . . . . . . . . . . . . . . . . . . . . 131

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GPS 1 14 Receiver User Guide vii

Contents

B Cables and Connectors

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134

Port A and Port B Connectors . . . . . . . . . . . . . . . . . . . . . 135

AgGPS PSO Plus Power/Data Cable . . . . . . . . . . . . . . . . . . 136

Ag Leader Yield Monitor Interface Cable . . . . . . . . . . . . . . . 137

Case AFS Dual Data Interface Cable . . . . . . . . . . . . . . . . . . 138

John Deere GreenStar Data Cable . . . . . . . . . . . . . . . . . . . 139

RDS Ceres Yield Monitor Power/Data Cable . . . . . . . . . . . . . 140

C NMEA-0183 Messages

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142

NMEA-0183 Message Structure . . . . . . . . . . . . . . . . . . . . 143

Symbols and delimiters . . . . . . . . . . . . . . . . . . . . . 145

Checksum values. . . . . . . . . . . . . . . . . . . . . . . . . 145

Field formats . . . . . . . . . . . . . . . . . . . . . . . . . . . 145

Null fields . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145

Talker ID codes. . . . . . . . . . . . . . . . . . . . . . . . . . 146

Latitude and longitude values . . . . . . . . . . . . . . . . . . 146

Time values. . . . . . . . . . . . . . . . . . . . . . . . . . . . 146

Reading NMEA string format . . . . . . . . . . . . . . . . . . 146

NMEA Message Summary . . . . . . . . . . . . . . . . . . . . . . . 147

GGA (GPS Fix Data) . . . . . . . . . . . . . . . . . . . . . . . . . . 149

GLL (Position Data) . . . . . . . . . . . . . . . . . . . . . . . . . . 150

GRS (GPS Range Residuals) . . . . . . . . . . . . . . . . . . . . . . 151

GSA (GPS DOP and Active Satellites) . . . . . . . . . . . . . . . . . 152

GST (GPS PRN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153

GSV (GPS Satellites in View) . . . . . . . . . . . . . . . . . . . . . 154

MSS (Beacon Receiver Signal Status) . . . . . . . . . . . . . . . . . 155

RMC (Recommended Minimum Specific GPS Data) . . . . . . . . . 156

VTG (Course Over Ground and Ground Speed) . . . . . . . . . . . . 158

XTE (Cross-Track Error) . . . . . . . . . . . . . . . . . . . . . . . . 159

ZDA (Time and Date). . . . . . . . . . . . . . . . . . . . . . . . . . 160

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GPS 114 Receiver User Guide

PTNLEV Proprietary (Event Marker). . . . . . . . . . . . . . . . . . 161

PTNLID Proprietary (Trimble Receiver ID) . . . . . . . . . . . . . . 162

PTNLDG Proprietary (Trimble DGPS Receiver St atus) . . . . . . . . 163

PTNL,GGK (Time, Position, Position Type, and DOP) . . . . . . . . 165

P T NLSM Proprietary (RTCM Special) . . . . . . . . . . . . . . . . . 166

D Navigation Maps

AgGPS Menu System . . . . . . . . . . . . . . . . . . . . . . . . . . 168

Navigation map for the AgGPS 114 Receiver —

Home, Field Operations, and Status menus . . . . . . . . 169

Navigation map for the AgGPS 114 Receiver —

Configuration menu . . . . . . . . . . . . . . . . . . . . 171

E Third-Party Interface Requirements

Third-Party Software . . . . . . . . . . . . . . . . . . . . . . . . . . 174

Third-Party Hardware. . . . . . . . . . . . . . . . . . . . . . . . . . 175

Contents

F Specifications

AgGPS 114 Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . 180

GPS Channels. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181

L-Band Satellite Differential Correction Receiver . . . . . . . . . . . 182

Receiver Default Settings . . . . . . . . . . . . . . . . . . . . . . . . 183

Index

Ag

GPS 1 14 Receiver User Guide ix

Contents

Ag

x

GPS 114 Receiver User Guide

About This Manual

Welcome to the AgGPS 114 Receiver User Guide. This manual
describes how to install and configure the AgGPS® 114 receiver. It
provides guidelines for using the AgRemote utility to view and
configure receiver DGPS and communication operating parameters.
The manual also provides guidelines for connecting the receiver to a
variety of external devices, information about NMEA messages
supported by the receiver, and pin-out diagrams for data cable
connections.

Even if you have used other Global Positioning System (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 GPS, go to the Trimble website
(www.trimble.com) for an interactive look at T r imble and GPS.

Related Information

Other sources of related information are:

• Release notes – the release notes describe new features of the
product, information that is not included in the manuals, and
any changes to the manuals. You can download release notes
from the Trimble website.

Ag

GPS 1 14 Receiver User Guide xi

About This Manual

Technical Assistance

If you have a problem and cannot find the information you need in the
product documentation, contact your local Trimble Reseller.

Your Comments

Your feedback about the supporting documentation helps us to
improve it with each revision. To forward your comments, do one of
the following:

• Send an e-mail to [e-mail].

• Complete the Reader Comment Form at the back of this manual
and mail it according to the instructions at the bottom of the
form.

If the reader comment form is not available, send comments and
suggestions to the address in the front of this manual. Please mark it
Attention: Technical Publications Group.

Document Conventions

The document conventions are as follows:

Convention Definition

Italics

Helvetica Narrow

Helvetica Bold Identifies a software command button, or

1

Ag

xii

GPS 114 Receiver User Guide

Identifies software menus, menu commands,
dialog boxes, and the dialog box fields.

Represents messages printed on the screen.

represents information that you must type in a
software screen or window.

Is an example of a hardware key (hard key) that
you must press on the

AgGPS 70 RDL keypad.

Convention Definition

About This Manual

“Select

Italics/Italics

” Identifies the sequence of menus, commands, or

dialog boxes that you must choose in order to
reach a given screen.

[Ctrl] Is an example of a hardware function key that you

must press on an office computer (PC). If you
must press more than one of these at the same
time, this is represented by a plus sign, for
example,

Screen Font Repre sents information on the display screen for

your receiver.

2 3 4 Represents buttons on the AgRemote screen.

1

[Ctrl]+[C].

Ag

GPS 1 14 Receiver User Guide xiii

About This Manual

Ag

xiv

GPS 114 Receiver User Guide

CHAPTER

1

Overview

In this chapter:

■ Introduction

■ The

■ Differential GPS (DGPS)

Ag

GPS 114 receiver

1

1 Overview

1.1

Introduction

1.2

The

Ag

GPS 114 Receiver

This chapter describes the AgGPS 114 receiver and gives an overview
of GPS, DGPS, and related information. For details of the receiver
physical specifications, see Appendix F , Specifications.

The AgGPS 114 receiver is a combined GPS receiver and antenna. It
provides Differential GPS capability, in a lightweight, durable, and
waterproof housing. See Figure 1.1.

The receiver contains The Choice™ technology, which enables
WAAS/EGNOS, OmniSTAR, or Thales real-time differential
corrections. For more information on DGPS options, see Configuring
Differential GPS, page 78.

Figure 1.1

Ag

2

GPS 114 Receiver User Guide

Ag

GPS 114 receiver

Overview 1

As part of a Precision Agriculture System, the receiver provides
submeter (less than 3.28 ft) static HRMS accuracy. To achieve this, the
receiver uses NMEA-0183 and TSIP (Trimble Standard Interface
Protocol) messages. The dynamic pass-to-pass accuracy is better than
the static accuracy . You can also use a 1 PPS (pulse per second) strobe
signal to synchronize time for logging event markers when you are
using external instruments.

You can use the receiver with a variety of farming equipment,
including yield monitors, parallel swathing guidance systems,
variable-rate planters, spray application controllers, and portable field
computers for field mapping and soil sampling.

1.2.1

Standard features

A standard AgGPS 114 system provides the following features:

• Combined GPS/DGPS receiver and antenna

• 12 GPS L1 1575.42 MHz (C/A-code) parallel tracking
channels, carrier-phase filtering

• Submeter static HRMS DGPS accuracy (with WAAS/EGNOS,
Thales, or OmniSTAR differential correction)

• 10 Hz (10 positions per second) output rate (Only in receivers
manufactured after 2001)

• AgRemote software program. This simulates a receiver LCD
screen interface to configure and view AgGPS 114 receiver
settings.

• Magnetic antenna mount

• Power/data cable

• Two RS-232 serial ports. These provide:
– NMEA-0183 output: GGA, GLL, GRS, GST, GSA, GSV,

– Trimble Proprietary NMEA messages: PTNLDG,

MSS, RMC, VTG, ZDA, XTE

PTNLEV, PTNL,GGK, PTNLID, PTNLSM

Ag

GPS 1 14 Receiver User Guide 3

1 Overview

– RTCM SC-104 input
– TSIP (Trimble Standard Interface Protocol) input and

output
– 1 PPS (pulse per second) strobe signal output
– Baud Rate: 2400-38400

• Two J1939 (CAN 2.0B) compatible ports

• Compatibility with:
– AgGPS 170 Field Computer
–

Ag

GPS 160 Field Computer
– AgGPS 70 Remote Display and Logger
– AgGPS 23 Exterior Lightbar
– AgGPS 21 Internal Lightbar
– AgGPS EZ-Map on an iPaq

Ag

4

GPS 114 Receiver User Guide

Overview 1

1.2.2

Receiver enhancements

Table 1.1 lists the receiver options that you can purchase with the
AgGPS 114 receiver.

Table 1.1 Receiver enhancement options

Option (PN) Description Use

Fast Rate
(33176-10)

Differential
Base Station
(33176-30)

EVEREST™
Technology
(33176-40)

Output position data up to 10 times
per second.

Outputs RTCM differential
corrections.

Reduces multipath interference Improves DGPS receiver accuracy.

Provides parallel swathing (PSO) and
variable rate applications

Enabled by default in receivers
manufactured after July 2001.

Activated when the Trimble PSO
Lightbar is physically connected.

If a radio link is attached, enables the
receiver to broadcast corrections for
use by other DGPS receivers. This
provides submeter positioning.

Activated when the lightbar is
connected.

Ag

GPS 1 14 Receiver User Guide 5

1 Overview

Table 1.1 Receiver enhancement options (Continued)

Option (PN) Description Use

RTS/CTS
Flow Control
Negotiation
(33176-50)

Point/Line/Area
(33176-80)

Provides hardware flow control When attached to third-party modems,

provides RTS/CTS flow control for
correct operation.

Makes it possible to add point, line,
and area data logging

Enables you to record points, lines, and
areas. The software writes ESRI Shape
files to the CompactFlash card of an
attached

Ag

GPS 70 RDL. You can then
view the Shapefiles using software such
as ESRI’s ArcView or Delta Data
System’s AGIS.

Makes it possible to add, store,
delete, and navigate to waypoints.

Enables you to:
– store up to 20 waypoints in the

receiver memory.
– use the lightbar to navigate to

waypoints
– read from a user-defined list on the

CompactFlash card of an attached

Ag

GPS 70 RDL

Ag

6

GPS 114 Receiver User Guide

Overview 1

1.2.3

Application options

Table 1.2 lists the application options that you can purchase with the
AgGPS 114 receiver.

Table 1.2 Application options

Option (PN) Description Use

Ag

GPS
Parallel
Swathing
Option
(34623-20)

Ag

GPS PSO
Plus for the

AgGPS 114

(34623-40)

Lightbar Indicates off-swath distance error. This

minimizes redundant applications and
skipped areas, and maximizes field
coverage.

Independent data ports Enables you to simultaneously control

the lightbar and output data to a variable
rate controller or mapping software
program.

Standard PSO, plus:

Ag

Handheld
Display and Logger

GPS 70 Remote

Use this option to record a swath
coverage map. Actual field area
covered, and the quality and date of
application is shown.

Use with the Point/Line/Area option.

Ag

GPS Field
Pack
(32294-xx)

Backpack (rigid frame or lumbar
pack), antenna poles, batteries, and
cables.

Provides hands-free receiver operation.
Useful for crop scouting and field
mapping when on foot, for example.

Ag

GPS 1 14 Receiver User Guide 7

1 Overview

1.2.4

Receiver input / output

The AgGPS 1 14 standard power/data cable (PN 40947-18) connects to
the single receiver connector to supply power. It also enables the
following data exchanges:

• ASCII, TSIP, and RTCM input from an external device.
The receiver is able to receive ASCII data from an external

device, convert this data into an NMEA message, and export
that message to another device. TSIP command packets
configure and monitor GPS and DGPS parameters. The receiver
is also able to accept RTCM data from an external device, such
as a pager .

• TSIP and NMEA output to an external device.
The receiver is able to output RTCM in base station mode.

When you are using an external radio, it can also receive DGPS
corrections. TSIP is input/output when communicating with
AgRemote. NMEA is output when the receiver is exporting
GPS position information to an external device, such as a yield
monitor or to a mapping software program.

8

For more information on the NMEA (National Marine
Electronics Association) and R T CM (Radio Technical
Commission for Maritime Services) communication standard
for GPS receivers, go to the following websites:

– www.nmea.org
– www.rtcm.org

• Lightbar protocol
LBAR is a Trimble proprietary protocol for communication

between AgGPS receivers and lightbars in guidance
applications.

Ag

GPS 114 Receiver User Guide

Overview 1

• 1 PPS output
To synchronize timing between external instruments and the

receiver’s internal clock, the connection port outputs a strobe
signal at 1 PPS (pulse per second). To output this signal, the
receiver must be tracking satellites and computing GPS
positions.

• J1939 (CAN) serial bus
Both serial ports support the J1939 CAN (Controller Area

Network) bus protocol. This protocol standardizes the way
multiple microprocessor-based electronic control units (ECUs)
communicate with each other over the same pair of wires. It is
used in off-highway machines, such as those used in
agriculture, construction, and forestry.
For more information, visit the SAE International website
(www.sae.org/servlets/index)

1.3

Differential GPS (DGPS)

The AgGPS 114 receiver uses DGPS to achieve high accuracy. One
receiver (this is called the reference or base station) is located at a
known point. This receiver is used to determine GPS signal
measurement errors. One or more mobile receivers (called rovers)
collect data at unknown locations, while remaining within range of the
reference station. The reference station broadcasts correction values,
which are applied to the receiver positions. In this way, errors
common to the reference and rover receivers are corrected.

For more information about DGPS and the different DGPS signals
available, visit the Trimble website
(www.trimble.com/gps/dgps.html).

Ag

GPS 1 14 Receiver User Guide 9

1 Overview

1.3.1

Sources of GPS error

Autonomous (GPS only) horizontal accuracy for Trimble AgGPS
receivers ranges from approximately 3–9 meters (about 10–30 ft).

The errors that cause this reduced accuracy are produced mainly by
atmospheric conditions, multipath, (GPS signals bouncing off objects
before reaching the antenna), and electronic or GPS frequency noise
interference.

DGPS removes most of the errors caused by atmospheric conditions,
errors which are further minimized by the advanced design of the

AgGPS 114 receiver. For more information, see the section on Error
Correction on the Trimble website at

www.trimble.com/gps/errors1.html

Ag

10

GPS 114 Receiver User Guide

Overview 1

1.3.2

DGPS accuracy

Submeter accuracy from the AgGPS 114 receiver utilizing differential
correction is best achieved under the conditions described in
Table 1.3.

Table 1.3 DGPS accuracy

Condition Optimum

Value

Number of
satellites used

Maximum
PDOP

> 5 To calculate a 3D position (latitude and longitude, altitude,

< 4 Position Dilution of Precision (PDOP) is a unitless, computed

Description

and time), four or more satellites must be visible.
To calculate a 2D position (latitude and longitude, and time),

three or more satellites must be visible.
The number of visible satellites constantly changes and is

typically in the range 5–9.
12 satellites simultaneously.

Note – To see when the maximum number of GPS satellites are
available, use the Quickplan utility and a current ephemeris
(satellite history) file. Both files are available free from:
www.trimble.com/support_trl.asp?Nav=Collection-3627

measurement of the geometry of satellites above the
receiver’s current location.

AgGPS receivers can track up to

Signal to Noise
Ratio

Minimum
Elevation

Multipath
environment

RTCM­compatible
corrections

Note – In some agricultural applications that do not require high
accuracy, a maximum PDOP of 12 or more can be used.

> 6 Signal-to-Noise ratio (SNR) is a measure of the satellite

signal strength against electrical background noise. A high
SNR gives better accuracy.

> 7.5 Satellite that are low on the horizon typically produce weak

and noisy signals and are more difficult for the receiver to
track. Satellites below the minimum elevation angle are not
tracked.

Low Multipath errors are caused when GPS signals are reflected

off nearby objects and reach the receiver by two or more
different paths. The receiver incorporates the EVEREST
multipath reduction option.

These corrections are broadcast from a Trimble 4000RSi™
or equivalent reference station.

Ag

GPS 114 Receiver User Guide 11

1 Overview

Position Output

Geographic data obtained from different sources must be referenced to
the same datum, ellipsoid, and coordinate format. Different formats
provide different coordinate values for any geographic location. In
North America, the datums NAD-27 and NAD-83 are commonly used
in GIS mapping applications.

The AgGPS 114 receiver outputs position coordinates in several
datums and ellipsoids depending on the source of DGPS being used.
See Table 1.4.

Table 1.4 DGPS source

Differential Source Datum Ellipsoid

None – Autonomous mode
OmniSTAR 3 North American Beams NAD-83
OmniSTAR Rest of World Beams ITRF

WGS-84

1

2

3

WGS-84
–

GRS-80
Thales Beams ITRF GRS-80
WAAS Beams WGS-84 WGS-84

1

World Geodetic System 1984. Datum and ellipsoid.

2

North American Datum 1983. Equivalent to WGS-84.

3

International Terrestrial Refere nce Frame. Contact the DGPS provider for details.

For more information, go to the National Geodetic Survey website:
www.ngs.noaa.gov/faq.shtml#WhatDatum.

Note – To convert GPS positions in the NAD-83 datum to background
maps for the old NAD-27 datum, use the conversion program
Corpscon. This is available free from the Topographic Engineering
Center (http://crunch.tec.army.mil/software/corpscon/corpscon.html).

Ag

12

GPS 114 Receiver User Guide

Overview 1

Position Output Format

The AgGPS receiver outputs positions in Degrees, Minutes, and
Decimal Minutes (DDD°MM.m'). This is the NMEA (National
Marine Electronic Association) standard format and is commonly
used worldwide for data transfer between electronic equipment.

1.3.3

Receiving satellite DGPS

The AgGPS 114 receiver supports subscription-based OmniSTAR, and
Thales, satellite differential technology. Contact the service provider
for service activation or an encrypted activation passcode. In addition,
the WAAS/EGNOS service is available free in North America and
Europe. For more information, see Configuring Differential GPS,
page 78, or go to the following websites:

• OmniSTAR (www.omnistar.com)

• Thales (www.landstar-dgps.com)

• WAAS (http://gps.faa.gov/Programs/WAAS/waas.htm)

Ag

GPS 1 14 Receiver User Guide 13

1 Overview

Ag

14

GPS 114 Receiver User Guide

CHAPTER

2

Installing the Receiver

In this chapter:

■ System components

■ Mounting the receiver

■ Connecting to an external device

■ CASE-IH

■ John Deere GreenStar

■ Ag Leader

■ AGCO FieldStar

■ RDS Ceres yield monitor

■ RDS Pro Series 8000 yield monitor

■ Laptop computer

■ Windows CE palmtop

■ Windows handheld computer

2

■ Micro-Trak yield monitor

2 Installing the Receiver

2.1

System Components

Check that you have received all the appropriate components for the
AgGPS system that you have purchased. If any containers or
components are damaged, immediately notify the shipping carrier, or
Trimble Agricultural Division at the address given in the front of this
manual. Components for each system are listed in the following
tables.

2.1.1

Table 2.1

Qty PN Description

1 38198-00
1 12920-00 Magnetic Mount for Antenna
1 40947-18 Power/data Cable
1 38201-10-ENG
1 25110-00 Warranty Activation Card

Ag

GPS 114 Receiver (PN 38200-00)

Optional extras (if ordered)

Table 2.2 Receiver options

Qty P/N Description

1 33176-10 Fast Rate Capability
1 33176-30 DGPS Reference Station

(Base Station Capability)

Ag

GPS 114 Receiver

AgGPS 114 Receiver User Guide

1 33176-40 EVEREST Multipath Reduction Technology

Table 2.3 Application options

1 34623-00
1 34623-20 Parallel Swathing Option Plus for

Ag

16

GPS 114 Receiver User Guide

Ag

GPS Parallel Swathing Option

Receiver and

Ag

GPS 70 RDL

Ag

GPS 114