Trimble AgGPS 122 Operation Manual

AgGPS™ 122

Operation Manual

Part Number: 30921-00
Revision: B
Date: March 1997

Trimble Navigation Limited
Surveying & Mapping Division
645 North Mary Av enue
Post Office Box 3642
Sunnyvale, CA 94088-3642
U.S.A.

[phone] in North America
[phone] International
FAX: [phone]

Trimble
Precision Agricultural Systems
9290 Bond Street, Suite 102
Overland Park, KS 66214
U.S.A.

[phone] in North America
[phone] International
FAX: [phone]

Trimble Navigation Europe Limited
Trimble House, Meridian Office Park
Osborn Way, Hook
Hampshire RG27 9HX
ENGLAND
[phone]
FAX: [phone]

Trimble Navigation Singapore PTE Limited
300 Beach Road
#34-05, The Concourse
Singapore 199555
SINGAPORE
[phone]
FAX: [phone]

Trimble Japan K.K.
Sumitomo Hamamatsu-cho, Building 10F
1-18-16 Hamamatsu-c ho Min ato -ku
Tokyo 105
JAPAN
[phone]
FAX: [phone]

Trimble Navigation New Zealand Limited
11 Birmingham Drive
P.O. Box 8729 Riccarton
Christchurch
NEW ZEALAND
[phone]
FAX: [phone]

Copyrights

© 1997 Trimble Navigation Limited. All rights reserved. No part of this manual may be
copied, photocopied, reproduced, translated, or reduced to any electronic medium or machine­readable form without prior written consent from Trimble Navigation Limited.

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

Revision Notice

This is the first release of the AgGPS 122 Operation Manual, Part Number 30921-00,
Revision B, March 1997.

Trademarks

AgGPS, 4000DS, 4000DSR, 4000MSK, 4000MSK DGPS Reference Station, 4000RS,
4000RSR, 4000SE, 4000SSE, 4000SSi, Land Surveyor II, Land Surveyor IID, System
Surveyor II, ProBeacon, Geodetic Surveyor, Geodetic System Surveyor, GIS Surveyor, DSM,
DSMPro, NavBeacon XL, TRIMTALK 900, TRIMTALK 450, TANS, and TSIP are
trademarks of Trimble Navigation Limited. IBM is a registered trademark of International
Business Machines, Inc. MS-DOS and W indo ws is a tradem ark of Microsoft Corp oration. Intel
is a trademark of Intel Corporation. All other brand names are trademarks of their respective
holders.

Disclaimer of Warranty

EXCEPT AS INDICATED IN “LIMITED WARRANTY” HEREIN, TRIMBLE HARDWARE,
SOFTWARE, FIRMWARE AND DOCUMENTATION IS PROVIDED “AS IS” AND WITHOUT
EXPRESS OR LIMITED WARRANTY OF ANY KIND BY EITHER TRIMBLE OR ANYONE WHO
HAS BEEN INVOLVED IN ITS CREATION, PRODUCTION, OR DISTRIBUTION INCLUDING
BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE. THE ENTIRE RISK, AS TO THE QUALITY AND
PERFORMANCE OF THE TRIMBLE HARDWARE, SOFTWARE, FIRMWARE AND
DOCUMENTATION, IS WITH YOU. SOME STATES DO NOT ALLOW THE EXCLUSION OF
IMPLIED WARRANTIES, SO THE ABOVE EXCLUSION MAY NOT APPLY TO YOU.

Limitation of Liability

IN NO EVENT WILL TRIMBLE OR ANY PERSON INVOLVED IN THE CREATION,
PRODUCTION, OR DISTRIBUTION OF THE TRIMBLE PRODUCT BE LIABLE TO YOU ON
ACCOUNT OF ANY CLAIM FOR ANY DAMAGES, INCLUDING ANY LOST PROFITS, LOST
SAVINGS, OR OTHER SPECIAL, INCIDENTAL, CONSEQUENTIAL, OR EXEMPLARY
DAMAGES, INCLUDING BUT NOT LIMITED TO ANY DAMAGES ASSESSED AGAINST OR
PAID BY YOU TO ANY THIRD PARTY, RISING OUT OF THE USE, LIABILITY TO USE,
QUALITY OR PERFORMANCE OF SUCH TRIMBLE PRODUCT INCLUDING HARDWARE,
SOFTWARE, FIRMWARE, AND DOCUMENTATION, EVEN IF TRIMBLE OR ANY SUCH
PERSON OR ENTITY HAS BEEN ADVISED OF THE POSSIBI LITY OF D AM A GES, OR FOR ANY
CLAIM BY ANY OTHER PART Y. SOME STATES DO NOT ALLOW THE LIMITATION OR
EXCLUSION OF LIABILITY FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES SO, THE
ABOVE LIMITATIONS MAY NOT APPLY TO YOU.

Software and Firmware Limited Warranty

Trimble warrants that Software and Firmware products will substantially conform to the
published specifications provided it is used with the Trimble products, computer products, and
operating system for which it was designed. For a period of ninety (90) days, commencing
thirty (30) da ys after ship ment from Trimble, Trim ble also w arrants that the magnet ic media on
which Software and Firmware are distributed and the documentation are free from defects in
materials and workmanship. During the ninety (90) day warranty period, Trimble will replace
defective media or documentation, or correct substantial program errors at no charge. If
Trimble is unable to replace defective media or documentation, or correct program errors,
Trimble will refund the price paid for The Software. These are your sole remedies for any
breach in warranty.

Hardware Limited Warranty

Trimble Navigation Limited products are warranted against defects in material and
workmanship for a period of one year. The warranty period shall commence thirty (30) days

after shipment from Trimble’s factory. Warranty service will be provided at a designated
Trimble Service Center . T rimble will at its option either repair or replace products that prove to
be defective. The Customer shall pay all shipping charges for products return ed to Trimble for
warranty service. Trimble shall pay all shipping charges for the return of products to the
Customer. This warranty shall not apply to defects resulting from:

1. Improper or inadequate maintenance by the buyer

2. Buyer-supplied software or interfacing

3. Unauthorized modification or misuse

4. Operation outside of the environmental specifications of the product

5. Improper installation, where applicable

6. Lightning or other electrical discharge

7. Fresh or salt water immersion or spray

8. Normal wear and tear on consumable parts (for example, batteries)
No other warranty is expressed or implied. Trimble Navigation Limited specifically disclaims

the implied warranties of fitness for a particular purpose and merchantability.

Table of Contents

Preface

Scope and Audience . . . . . . . . . . . . . . . . . . . . . . . . xvii

Organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . xviii

Related Publications . . . . . . . . . . . . . . . . . . . . . . . . xix

Related Information . . . . . . . . . . . . . . . . . . . . . . . . xix

Update Notes . . . . . . . . . . . . . . . . . . . . . . xx

Trimble Bulletin Board Service . . . . . . . . . . . . . xx

FTP Site . . . . . . . . . . . . . . . . . . . . . . . . . xx

WWW Site. . . . . . . . . . . . . . . . . . . . . . . . xx

Technical Assistance. . . . . . . . . . . . . . . . . . . xxi

FaxBack . . . . . . . . . . . . . . . . . . . . . . . . . xxi

Reader Comment Form . . . . . . . . . . . . . . . . . . . . . . xxi

Document Conventions . . . . . . . . . . . . . . . . . . . . . . xxii

Notes, Tips, Cautions, and Warnings . . . . . . . . . . . . . . . xxiii

1Overview

1.1 AgGPS 122 Hardware . . . . . . . . . . . . . . . . . . . . . . . 1-2

1.2 Standard Features . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

1.3 Optional Accessories and Components . . . . . . . . . . . . . . 1-4

1.4 Operating Characteristics . . . . . . . . . . . . . . . . . . . . . 1-5

1.4.1 Integrity Monitoring . . . . . . . . . . . . . . . . . . . 1-5

1.4.2 Part Numbers . . . . . . . . . . . . . . . . . . . . . . 1-6

AgGPS 122 Operation Manual v

Table of Contents

1.5 Receiver Connections . . . . . . . . . . . . . . . . . . . . . . . 1-7

1.5.1 Port A – RTCM Input and NMEA Output . . . . . . . 1-7

1.5.2 Port B – TSIP Input and Output . . . . . . . . . . . . . 1-8

1.5.3 1 PPS Output . . . . . . . . . . . . . . . . . . . . . . 1-8

1.6 TSIP Talker Software . . . . . . . . . . . . . . . . . . . . . . . 1-8

1.7 Differential GPS Positioning. . . . . . . . . . . . . . . . . . . . 1-9

1.7.1 Sources of DGPS Error . . . . . . . . . . . . . . . . . 1-9

1.7.2 Critical Factors Affecting DGPS Accuracy . . . . . . . 1-11

1.8 Beacon Signal Processing . . . . . . . . . . . . . . . . . . . . . 1-15

1.8.1 Beacon Pre-filtering . . . . . . . . . . . . . . . . . . . 1-16

1.8.2 Beacon Automatic Gain Control . . . . . . . . . . . . 1-16

1.8.3 Beacon Analog-to-Digital Conversion . . . . . . . . . 1-16

1.8.4 Beacon Digital Signal Processing . . . . . . . . . . . . 1-16

1.8.5 Beacon I/O Processing. . . . . . . . . . . . . . . . . . 1-17

1.9 Combined Antenna . . . . . . . . . . . . . . . . . . . . . . . . 1-18

1.10 Working with Datums . . . . . . . . . . . . . . . . . . . . . . . 1-18

2 Installing the AgGPS 122 Receiver

2.1 Unpacking and Inspecting the Shipment . . . . . . . . . . . . . 2-2

2.1.1 Opening the Shipping Carton . . . . . . . . . . . . . . 2-2

2.1.2 Reporting Shipping Problems . . . . . . . . . . . . . . 2-3

2.2 Installation Guidelines . . . . . . . . . . . . . . . . . . . . . . . 2-3

2.2.1 Choosing a Location. . . . . . . . . . . . . . . . . . . 2-3

2.2.2 Considering Environmental Conditions . . . . . . . . . 2-4

2.2.3 Input Power Requirements . . . . . . . . . . . . . . . 2-4

2.3 Mounting the Receiver. . . . . . . . . . . . . . . . . . . . . . . 2-5

2.4 Mounting the Antenna . . . . . . . . . . . . . . . . . . . . . . . 2-6

2.4.1 Sources of Electrical Interference . . . . . . . . . . . . 2-6

2.4.2 Pole Mounting the Antenna . . . . . . . . . . . . . . . 2-7

2.4.3 Magnetic Mounting the Antenna . . . . . . . . . . . . 2-8

vi AgGPS 122 Operation Manual

2.5 Routing and Connecting the Antenna Cable . . . . . . . . . . . . 2-9

2.5.1 Routing and Connecting the Antenna Cable . . . . . . 2-10

2.6 Connecting the Interface Devices . . . . . . . . . . . . . . . . . 2-11

2.6.1 Data and Power Port Connectors . . . . . . . . . . . . 2-11

2.6.2 Standard Interface Cables . . . . . . . . . . . . . . . . 2-13

2.6.3 Optional Interface Cables . . . . . . . . . . . . . . . . 2-14

2.6.4 Connecting a Ag Leader Yield Monitor 2000. . . . . . 2-15

2.6.5 Connecting a Micro-Trak Data Logger . . . . . . . . . 2-16

2.6.6 Connecting the Receiver to a PC . . . . . . . . . . . . 2-17

2.6.7 Using the Dual Data and Power Cable . . . . . . . . . 2-19

2.7 Connecting the Switched Power Source . . . . . . . . . . . . . . 2-20

3 Configuring the AgGPS 122 Receiver

3.1 TSIP Talker Overview . . . . . . . . . . . . . . . . . . . . . . . 3-1

Table of Contents

3.1.1 Understanding TSIP Protocol . . . . . . . . . . . . . . 3-2

3.1.2 TSIP Talker Installation . . . . . . . . . . . . . . . . . 3-2

3.1.3 Starting TSIP Talker in Windows 3.1 . . . . . . . . . . 3-2

3.1.4 Starting TSIP Talker in Windows 95 . . . . . . . . . . 3-3

3.1.5 TSIP Talker Menus . . . . . . . . . . . . . . . . . . . 3-3

3.1.6 Working with TSIP Talker Windows . . . . . . . . . . 3-6

3.1.7 Finding Help. . . . . . . . . . . . . . . . . . . . . . . 3-7

3.2 Defining Setup Options . . . . . . . . . . . . . . . . . . . . . . 3-8

3.2.1 Configuring the PC Serial Port . . . . . . . . . . . . . 3-8

3.2.2 Configuring Port A . . . . . . . . . . . . . . . . . . . 3-10

3.2.3 Configuring Port B . . . . . . . . . . . . . . . . . . . 3-13

3.2.4 TSIP Break . . . . . . . . . . . . . . . . . . . . . . . 3-15

3.2.5 Units . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16

3.3 Configuring GPS Parameters . . . . . . . . . . . . . . . . . . . 3-16

3.3.1 Configuring the Approximate Initial Position. . . . . . 3-17

3.3.2 Configuring GPS Mask Parameters . . . . . . . . . . . 3-19

AgGPS 122 Operation Manual vii

Table of Contents

3.3.3 Configuring the Advanced Receiver Parameters . . . . 3-23

3.3.4 Configuring the 2D Altitude. . . . . . . . . . . . . . . 3-28

3.3.5 Configuring NMEA Output . . . . . . . . . . . . . . . 3-29

3.3.6 Configuring the Advanced NMEA Options. . . . . . . 3-31

3.3.7 Configuring the Receiver for DGPS Input . . . . . . . 3-36

3.3.8 Configuring DGPS Output . . . . . . . . . . . . . . . 3-38

3.3.9 Resetting the Receiver . . . . . . . . . . . . . . . . . . 3-39

3.4 Configuring Beacon Parameters . . . . . . . . . . . . . . . . . . 3-40

3.4.1 Selecting the Channel Control. . . . . . . . . . . . . . 3-41

3.4.2 Working with the Beacon List. . . . . . . . . . . . . . 3-43

3.4.3 Controlling the Health of Radiobeacons . . . . . . . . 3-48

3.4.4 Displaying Wideband FFT Diagnostic Plots . . . . . . 3-50

4 Viewing Reports

4.1 Receiver Information Report. . . . . . . . . . . . . . . . . . . . 4-2

4.2 Analog Status Report . . . . . . . . . . . . . . . . . . . . . . . 4-4

4.2.1 Position Info Report . . . . . . . . . . . . . . . . . . . 4-5

4.2.2 Satellite Info Report . . . . . . . . . . . . . . . . . . . 4-8

4.2.3 Sky Plot . . . . . . . . . . . . . . . . . . . . . . . . . 4-12

4.2.4 Beacon Channel Status Report . . . . . . . . . . . . . 4-14

4.2.5 DGPS Message Summary Report . . . . . . . . . . . . 4-17

A Specifications

A.1 Physical Characteristics . . . . . . . . . . . . . . . . . . . . . . A-1

A.2 Performance Characteristics . . . . . . . . . . . . . . . . . . . . A-2

B DGPS Radiobeacons
C Scorpio™

Option

viii AgGPS 122 Operation Manual

D NMEA-0183 Messages

D.1 NMEA-0183 Message Structure . . . . . . . . . . . . . . . . . . D-1

D.1.1 Symbols and Delimiters . . . . . . . . . . . . . . . . . D-3

D.1.2 Checksum Values . . . . . . . . . . . . . . . . . . . . D-4

D.1.3 Field Formats . . . . . . . . . . . . . . . . . . . . . . D-4

D.2 NMEA Message Summary . . . . . . . . . . . . . . . . . . . . D-6

D.3 ALM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-7

D.4 GGA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-8

D.5 GLL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-8

D.6 GSA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-10

D.7 GSV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-11

D.8 MSS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-12

D.9 RMC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-13

D.10 VTG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-14

Table of Contents

D.11 ZDA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-15

E Cables and Connectors

E.1 Port A and Port B Connectors . . . . . . . . . . . . . . . . . . . E-2

E.2 Ag Leader Interface Cable. . . . . . . . . . . . . . . . . . . . . E-3

E.3 Data Interface Cable . . . . . . . . . . . . . . . . . . . . . . . . E-4

E.4 Dual Data Interface Cable. . . . . . . . . . . . . . . . . . . . . E-5

E.5 Data Extension Cable . . . . . . . . . . . . . . . . . . . . . . . E-6

E.6 Case AFS Cable . . . . . . . . . . . . . . . . . . . . . . . . . . E-7

AgGPS 122 Operation Manual ix

Table of Contents

F Troubleshooting

F.1 Checking Tracking Status . . . . . . . . . . . . . . . . . . . . . F-1

F.1.1 Isolating GPS Tracking Problems . . . . . . . . . . . . F-2

F.1.2 Isolating Radiobeacon Tracking Problems . . . . . . . F-3

F.2 Lithium Battery Failure . . . . . . . . . . . . . . . . . . . . . . F-4

G Option Summary

Index

x AgGPS 122 Operation Manual

List of Figures

Figure 1-1. AgGPS 122 Receiver. . . . . . . . . . . . . . . . . . . . . . 1-1

Figure 1-2. Back Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

Figure 2-1. Antenna Cable Connections . . . . . . . . . . . . . . . . . . 2-9

Figure 2-2. Data Interface (and Power) Ports. . . . . . . . . . . . . . . . 2-11

Figure 2-3. Connecting a Ag Leader Yield Monitor 2000 . . . . . . . . . 2-15

Figure 2-4. Interfacing a Micro-Trak Data Logger . . . . . . . . . . . . . 2-16

Figure 2-5. Interfacing the Receiver to a PC . . . . . . . . . . . . . . . . 2-17

Figure 2-6. Connecting a PC with a Dual Interface Cable . . . . . . . . . 2-19

Figure 3-1. TSIP Talker Menu Bar . . . . . . . . . . . . . . . . . . . . . 3-3

Figure 3-2. Comport Dialog . . . . . . . . . . . . . . . . . . . . . . . . 3-8

Figure 3-3. Setup Port-A Dialog . . . . . . . . . . . . . . . . . . . . . . 3-11

Figure 3-4. Units Dialog . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16

Figure 3-5. Initial Position Dialog . . . . . . . . . . . . . . . . . . . . . 3-17

Figure 3-6. Receiver Parameters Dialog . . . . . . . . . . . . . . . . . . 3-19

Figure 3-7. Advanced Receiver Parameters. . . . . . . . . . . . . . . . . 3-23

Figure 3-8. 2D Altitude Dialog . . . . . . . . . . . . . . . . . . . . . . . 3-28

Figure 3-9. NMEA Output Dialog . . . . . . . . . . . . . . . . . . . . . 3-29

Figure 3-10. Advanced NMEA Options . . . . . . . . . . . . . . . . . . . 3-31

Figure 3-11. DGPS Input. . . . . . . . . . . . . . . . . . . . . . . . . . . 3-36

Figure 3-12. Receiver Reset . . . . . . . . . . . . . . . . . . . . . . . . . 3-39

Figure 3-13. Beacon Channel Control . . . . . . . . . . . . . . . . . . . . 3-41

Figure 3-14. Beacon List. . . . . . . . . . . . . . . . . . . . . . . . . . . 3-43

Figure 3-15. Beacon Information . . . . . . . . . . . . . . . . . . . . . . 3-46

Ag

GPS 122 Operation Manual xi

List of Figures

Figure 3-16. Beacon Health Control . . . . . . . . . . . . . . . . . . . . . 3-48

Figure 3-17. Wideband FFT . . . . . . . . . . . . . . . . . . . . . . . . . 3-50

Figure 4-1. Receiver Information Report. . . . . . . . . . . . . . . . . . 4-2

Figure 4-2. Analog Status Report. . . . . . . . . . . . . . . . . . . . . . 4-4

Figure 4-3. Position Info Settings Dialog. . . . . . . . . . . . . . . . . . 4-5

Figure 4-4. Position Info Report . . . . . . . . . . . . . . . . . . . . . . 4-7

Figure 4-5. Satellite Info Settings Report. . . . . . . . . . . . . . . . . . 4-8

Figure 4-6. Satellite Info Report . . . . . . . . . . . . . . . . . . . . . . 4-11

Figure 4-7. Sky Plot Settings . . . . . . . . . . . . . . . . . . . . . . . . 4-12

Figure 4-8. Sky Plot. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-13

Figure 4-9. Beacon Channel Status Report . . . . . . . . . . . . . . . . . 4-14

Figure 4-10. DGPS Message Summary . . . . . . . . . . . . . . . . . . . 4-17

Figure D-1. Sample ZDA Message Structure . . . . . . . . . . . . . . . . D-1

Figure F-1. Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . F-1

xii

Ag

GPS 122 Operation Manual

List of Tables

Table 1-1. Part Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

Table 2-1. AgGPS 122 Components. . . . . . . . . . . . . . . . . . . . 2-2

Table 2-2. AgGPS 122 Upgrades . . . . . . . . . . . . . . . . . . . . . 2-2

Table 2-3. Optional Components . . . . . . . . . . . . . . . . . . . . . 2-3

Table 2-4. Standard Cables . . . . . . . . . . . . . . . . . . . . . . . . 2-13

Table 2-5. Optional Cables. . . . . . . . . . . . . . . . . . . . . . . . . 2-14

Table 3-1. TSIP Talker Menus. . . . . . . . . . . . . . . . . . . . . . . 3-4

Table 3-2. Window Menu Commands. . . . . . . . . . . . . . . . . . . 3-6

Table 3-3. Help Menu Commands. . . . . . . . . . . . . . . . . . . . . 3-7

Table 3-4. Comport Parameters . . . . . . . . . . . . . . . . . . . . . . 3-9

Table 3-5. Port A Default Settings. . . . . . . . . . . . . . . . . . . . . 3-10

Table 3-6. Port A Parameters . . . . . . . . . . . . . . . . . . . . . . . 3-12

Table 3-7. Port-B Default Settings. . . . . . . . . . . . . . . . . . . . . 3-14

Table 3-8. TSIP Break Default Settings . . . . . . . . . . . . . . . . . . 3-15

Table 3-9. Initial Position Parameters . . . . . . . . . . . . . . . . . . . 3-18

Table 3-10. Receiver Parameters Settings. . . . . . . . . . . . . . . . . . 3-19

Table 3-11. Position Mode Parameter Settings . . . . . . . . . . . . . . . 3-20

Table 3-12. Dynamic Code Parameter Settings. . . . . . . . . . . . . . . 3-22

Table 3-14. Overdetermined Mode Settings . . . . . . . . . . . . . . . . 3-27

Table 3-15. NMEA-0183 Messages. . . . . . . . . . . . . . . . . . . . . 3-30

Table 3-16. NMEA VTG Options. . . . . . . . . . . . . . . . . . . . . . 3-32

Table 3-17. NMEA RMC Speed Options . . . . . . . . . . . . . . . . . . 3-33

Table 3-18. DGPS Input Options . . . . . . . . . . . . . . . . . . . . . . 3-36

Ag

GPS 122 Operation Manual xiii

List of Tables

Table 3-19. DGPS Mode Options . . . . . . . . . . . . . . . . . . . . . . 3-37

Table 3-20. External DGPS Source Options . . . . . . . . . . . . . . . . 3-38

Table 3-21. Reset Options. . . . . . . . . . . . . . . . . . . . . . . . . . 3-39

Table 3-22. Mode Parameter . . . . . . . . . . . . . . . . . . . . . . . . 3-42

Table 3-23. Beacon List Columns. . . . . . . . . . . . . . . . . . . . . . 3-44

Table 3-24. Beacon Information . . . . . . . . . . . . . . . . . . . . . . 3-47

Table 4-1. Receiver Information Report Fields . . . . . . . . . . . . . . 4-3

Table 4-2. Analog Status Report Fields . . . . . . . . . . . . . . . . . . 4-4

Table 4-3. Position Info Settings Options . . . . . . . . . . . . . . . . . 4-6

Table 4-4. Position Info Report Fields. . . . . . . . . . . . . . . . . . . 4-7

Table 4-5. Satellite Information Fields . . . . . . . . . . . . . . . . . . 4-9

Table 4-6. Beacon Channel Status Fields . . . . . . . . . . . . . . . . . 4-15

Table B-1. Worldwide DGPS Radiobeacon List, August 1996 . . . . . . B-2

Table D-1. Sample ZDA Message Structure . . . . . . . . . . . . . . . . D-2

Table D-2. Supported NMEA-0183 Messages. . . . . . . . . . . . . . . D-6

Table D-3. ALM Message Fields. . . . . . . . . . . . . . . . . . . . . . D-7

Table D-4. GGA Message Fields. . . . . . . . . . . . . . . . . . . . . . D-8

Table D-5. GLL Message Fields . . . . . . . . . . . . . . . . . . . . . . D-9

Table D-6. GSA Message Fields . . . . . . . . . . . . . . . . . . . . . . D-10

Table D-7. GSV Message Fields . . . . . . . . . . . . . . . . . . . . . . D-11

Table D-8. MSS Message Fields . . . . . . . . . . . . . . . . . . . . . . D-12

Table D-9. RMC Message Fields. . . . . . . . . . . . . . . . . . . . . . D-13

Table D-10. VTG Message Fields . . . . . . . . . . . . . . . . . . . . . . D-14

Table D-11. ZDA Message Fields . . . . . . . . . . . . . . . . . . . . . . D-15

Table E-1. Connector Pin-out for AgGPS 122 Port A and Port B . . . . . E-2

Table E-2. Ag Leader Yield Monitor Cable Pin-out (Part 30660) . . . . . E-3

Table E-3. Data Interface Cable Pin-out (P/N 30945) . . . . . . . . . . . E-4

Table E-4. Dual Data Interface Cable Pin-out (Part 32015) . . . . . . . . E-5

Table E-5. Data Extension Cable Pin-out (P/N 30700) . . . . . . . . . . E-6

Table E-6. Case AFS Cable Pin-out (P/N 32609) . . . . . . . . . . . . . E-7

xiv

Ag

GPS 122 Operation Manual

List of Tables

Table F-1. Tracking Status LEDs . . . . . . . . . . . . . . . . . . . . . F-2

Table G-1. Parameter Settings . . . . . . . . . . . . . . . . . . . . . . . G-1

Ag

GPS 122 Operation Manual xv

List of Tables

xvi

Ag

GPS 122 Operation Manual

Preface

Welcome to the AgGPS 122 Operation Manual. This manual
describes the installation and configuration of the AgGPS 122 which
combines the functionality of a differential GPS receiver and Beacon
receiver, packaged within a light weight, rugged, weatherproof
housing.

The AgGPS 122 utilizes Trimble’s advanced low-power, low noise,

high-accurac y Maxwell c hip techno logy to achi ev e real- time DGPS to
submeter accuracy. The AgGPS 122 receiver outputs both a selection
of standard NMEA-0183 messages and raw measurements in TSIP
(Trimble Standa rd Interface Protocol), offeri ng optimal flexibility
when interfacing wi th other instruments. The receiver also can be
configured to output a 1 PPS (pulse per second) strobe signal to
synchronize time with external instruments and to log event marker
input from external instruments.

The AgGPS 122 receiver contains a dual-channel, all-digital, fully­automatic radiobeacon receiver for acqu iring DGPS radiobeacon
broadcasts conforming to the IALA standard.

Scope and Audience

Even if you have used other Global Positioning System (GPS)
receivers and Beacon receivers we recommend that you spend some
time reading this manual. The following section provides you with a
guide to this manual, as well as to ot her docume nta ti on included with
this product.

AgGPS 122 Operation Manual xvii

Preface

Organization

This manual contains the following chapters and appendices:

•

•

•

•

•

Chapter 1, Overview, provides a brief overview of Differential

GPS, and AgGPS 122 components.

Chapter 2, Installing the AgGPS 122 Receiver, contains

installation and interfacing instructions for the AgGPS 122

receiver.

Chapter 3, Configuring the AgGPS 122 Receiver, gives

instructio ns for usi ng the TSIP Talker so ftwa re to conf ig ure the

receiver operating parameters and monitor receiver functions.

Chapter 4, Viewing Reports, gives instructions for using TSIP

Talker to view receiver configuration reports, satellite

information reports, and radiobeacon information reports.

Appendix A, Specifications, identifies the physical

characteristics and general specifications of the AgGPS 122

receiver.

Appendix B, DGPS Radiobeacons, contains a Trimble

•

compiled listing of differential radiobeacons and marine

radiobeacons.

Appendix C, Scorpio™

•

Option, describes the added

capabilities of the AgGPS 122 receiver with the Scorpio option.

Appendix D, NMEA-0183 Messages, describes the struct ure of

•

the selection of NMEA mess ages suppo rted b y the AgGPS 122

receiver.

Appendix E, Cable s and Conne ctors, i ncludes p in-out diag rams

•

for the standard and optional cables.

• Appendix F, Troubleshooting, gives guidelines for solving

potential problems.

xviii AgGPS 122 Operation Manual

Related Publications

The AgGPS 122 recei ver publication set includes th ree manuals—the
AgGPS 122 Operation Manual, the optional TSIP Talker User’s

Guide, and the optional Differential Beacon GPS TSIP Reference.

The AgGPS 122 Operation Ma nual , P/N 30921-00, (this

•

manual) includes step-by-step instructions for installing the

AgGPS 122 receiver and guidelines for using the included

software programs to configure the operating parameters and

control receiver functions. Also included are guidelines for

interfacing the AgGPS 122 receiver to a PC and agricultural

instruments, information about the selection of NMEA

messages supported by the receiver, and connector pin-out

diagrams for Port A, Port B, and cable connections.

The TSIP Talker User’s Guide (P/N 30921-00) includes step-

•

by-step instructions for using th e TSIP Talker software to

configure Trimble products. The presentation of information is

generic and applies to several Trimble products. All of the

informatio n presented in the TSIP Talker User’s Guide is

included in the AgGPS 122 Operation Manual (see above).

Preface

The optional Differential Beacon GPS TSIP Reference (P/N

•

31157-00) includes detailed information about TSIP (Trimble

Standard Inter face Prot ocol) pack et struct ures, number for mats,

and conventions. The contents of TSIP command and report

packets are described in detail. A numerical and alphabetical

index of command and report packets is provided for quickly

locating the location of specific information about a packet.

This manual is required for system integrators who are

developing TSIP software applications.

Related Information

This manual contains system-wide, general information about the
AgGPS 122. The following sections discuss other sources of
information.

AgGPS 122 Operation Manual xix

Preface

Update Notes

You will find a Warranty Activation Sheet with your AgGPS 122
receiver. By sending in your Warranty Activation Sheet, you are
automatically sent update notes as they become available. When you
receive these packages, read them. They contain important
information about sof twa re and h ardwa re cha nges. Contact your l ocal
Trimble Dealer for more information about the support agreement
contrac ts for software and firmwar e, and an exte nded warranty
programs for hardware.

Trimble Bulletin Board Service

If you have a modem, check the Trimble Surveying and Mapping
Bulletin Board Servi ce (BBS) on a r eg ular b asis f or app licat ion no tes,
new software release notices, and other information. The phone
numbers are:

[phone]
communication parameters: 8, n, 1

FTP Site

Trimble maintains a FTP (File Transfer Protocol) site at the following
address:

ftp://ftp.t ri mble.com

WWW Site

Trimble maintains a WWW (Wo rld Wide Web) p age at the foll owing
address:

http://www.trimble.com

xx AgGPS 122 Operation Manual

Technical Assistance

If you hav e probl ems and cann ot f in d the i nformat ion yo u need i n thi s
document, call the Trimble Technical Assistance Center (TAC). The
phone numbers are:

[phone] (in North America)
[phone] (International)
[phone] (fax)

You can call the Technical Assistance Center phones between 6 AM
to 6 PM Pacific Standard Time. A support technician will take your
call, help you determine the source of your problem, and provide you
with any technical assistance you might need.

FaxBack

FaxBack is a co mpletely automated f ax r esponse system for selec ti ng
documents and cat alogs (lists of available documents) to be faxed
back to a fax machine. Call from a tone-dialing phone and FaxBack
guides you through the call by playing a pre-recorded voice message.

Preface

The FaxBack system is available 24 hours a day, seven days a week.
You can order a variety of documents, including; data sheets,
application notes, technical documentation, configuration guides,
assembly drawings, and general information.

To call the FaxBack service, dial [phone] and follow the
instruc tions received.

Reader Comment Form

A reader comment form is provided at the end of this guide. If this
form is not available, comments and suggestions can be sent to:
Editor, AgGPS 122 Publications, Trimble Navigation Limited, 645
North Mary Avenue, Post Office Box 3642, Sunnyvale, CA 94088-

3642. All comments and suggestions become the property of Trimble
Navigation Limited.

AgGPS 122 Operation Manual xxi

Preface

Document Conventions

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

SMALL CAPITALS identify DOS commands, directories, filenames,

and filename extensions.

Courier

is used to represent what you see printed on the screen by

the DOS s ystem or program.

Courier Bold

represents information that you must type in a

software screen or window.
[Return] or [Ctrl] + [C] identifies a hardware function key or key

combination that you must press on a PC.

Helvetica Bold represents a software command button.

xxii AgGPS 122 Operation Manual

Notes, Tips, Cautions, and Warnings

Notes, tips, cautions, and warnings are used to emphasize important
information.

Note – Notes give additional significant information about the subject

*

F

I

to increase your knowledge, or guide your actions. A note can
precede or follow the text it references.

Tip – Indicates a shortcut or other time or labor-saving hint that can
help you make better use of the AgGPS 122 receiver System.

Caution – Cautions alert you to situations that could cause hardware
damage or software error. A caution precedes the text it references.

Preface

Warning – W arnings alert you to situations that could cause personal

M

AgGPS 122 Operation Manual xxiii

injury or unrecoverable data loss. A warning precedes the text it
references.

Preface

xxiv AgGPS 122 Operation Manual

1Overview

The AgGPS 122 combines a GPS (Global Positioning System)
receiver and Beacon receiver into one unit, packaged in a light­weight, durable, waterproof housing (see Figure 1-1).

Figure 1-1.

The AgGPS 122 receiver is designed to interface to agricultural data
monitoring devices, such as the Ag Leader
Micro-Trak Data Logger, notebook PCs, or comparable instruments.

AgGPS 122 Operation Manual 1-1

Ag

GPS 122 Receiver

®

Yield Monitor 2000,

Overview

The receiver features advanced low-power, low-noise, high-accuracy
Scorpion chip technology to achieve real-time DGPS submeter
accuracy. The recei v er fe ature s a multi -bit , fr ont-e nd digit izer with 12

1

channels

of continuous satellite tracking. Advanced carrier-phase
filtering techniques applied to exceptionally low-noise C/A code
measurements are used to gen erate real-time submet er pos it ions at an
optional maximum rate of 10 Hz, even under the most challenging
operating conditions.

The receiver also f eatures a dual-channel, all-digital, fully-a utomatic
Beacon receiver electronics for tracking broadcasts from radiobeacon
stations conforming to the IALA Standard. The receiver uses
advanced digital-signal processing techniques to track and
demodulate signals from rad iobeacon stations. The radiobeacons
operate in the MF (medium frequency) band from 283.5 kHz to
325 kHz.

This chapter gives a brief overview of the AgGPS 122 receiver.

1.1

Ag

GPS 122 Hardware

The AgGPS 122 receiver supports a subset of the standard NMEA­0183 messages as outputs, raw measurements in Trimble Standard
Interface Protocol (TSIP), and 1 PPS (Pulse per Second) output,
offering optimal flexibility in interfacing with other instruments.

For optimum performance, the AgGPS 122 accepts differential GPS
corrections in the RTCM-SC-104 standard format transmitted from
radiobeacons. This pro duct provi des the benef its of e xcellent GPS and
Beacon performance in a compact package.

1.

Early models of the AgGPS 122 receiver supported 8 GPS channels.

1-2 AgGPS 122 Operation Manual

1.2 Standard Features

The AgGPS 122 provides the following:

A multibit, front-end digitizer with 8 or 12 GPS (C/A-code)

•

tracking channels, carri er -pha se f ilt ering and ins tanta neous full
wav elength carrier-phase measurement s

Automatically switches radiobeacon channels to track the

•

closest or most powerful radiobeacons
Submeter accuracy: typically less than 1 meter RMS; assumes

•

at least 5 satellites, PDOP less than 4, and RTCM SC-104
standard format broadcasts from a radiobeacon station

Real-time processing

•

Optional 10 Hz maximum position and velocity update rate

•

Positioning based on carrier-phase filtered L1 pseudoranges

•

Velocity computations incorporate carrier-phase data

•

Overview

L1 C/A code outputs (maximum rate of 1 Hz)

•

Time of First Fix (TTFF): less than 30 seconds, typical

•

NMEA-0183 Message Outputs: ALM, GGA, GLL, GSA,

•

GSV, MSS, RMC, VTG, ZD A (t he def aul t NMEA me ssages t o
output are GGA, GSA, and VTG)

Two fully automatic radiobeacon acquisition modes and a

•

manual acquisition mode
Fast acquisition of radiobeacon beacon signals

•

Immunity to radiobeacon jamming signals

•

• Advanced techniques for combatting atmospheric noise in the

Beacon receiver electronics

• Automatic Beacon data integrity monitoring

• High sensitivity and low susceptibility to noise in Beacon

receiver electronics

• Two RS-232 serial/power ports

AgGPS 122 Operation Manual 1-3

Overview

NMEA-0183 output/RTCM SC-104 Input

•

TSIP Input and output

•

Outputs 1 PPS (pulse per second) strobe signal on either serial

•

port, allowing an external instrument to synchronize its internal
timebase with the AgGPS 122 clock oscillator

TSIP Talker Software

•

Operation Manual

•

Combined L1 GPS and H-Field Loop Beacon antenna

•

Magnetic antenna mount

•

PC Data and power cables

•

PC/Micro-Trak Cable

•

Ag Leader Yield Monitor Cable

•

Antenna cable, 10-meter RG58, male TNC to male TNC

•

Scorpio™ System option

•

1.3 Optional Accessories and Components

The following accessories or components are also available:

Dual-connection data and power cable

•

12-foot data interface extension cable

•

Differential Beacon GPS TSIP Reference Manual

•

TSIP Talker Software User’s Guide

•

Field Pack

•

1-4 AgGPS 122 Operation Manual

1.4 Operating Characteristics

After applying power, the AgGPS 122 receiver scans parameter
settings stored battery-backed memory and configures the unit for
operation.

The default configuration for the AgGPS 122 receiver allows the
receiver to operate in Auto Ra nge a cqui si tion mode. In this mode, t he
AgGPS 122 receiver automatically builds a radiobeacon database
containing a listing of the ten most powerful radiobeacons in the
vicinity and uses the closest beacon. Both Beacon channels are
configure d to search for and trac k the two nearest r adi obe acons in the
database. The unit demodulates the data carried on the radiobeacon
signal and outputs GPS NMEA messages to the interface device
through Port A.

Note – The AgGPS 122 receiver actually has two modes of automatic

*

radiobeacon signal acquisition and one manual mode of radiobeacon
signal acquisition. For detailed information, see Selecting the Channel
Control on page 3-41.

Overview

When configured for Manual acquisition mode, the AgGPS 122
receiver searches for a user-defined radiobeacon station frequency.
Once a signal is acquired, the AgGPS 122 receiver starts to perform
differential positioning.

1.4.1 Integrity Monitoring

In the Auto Range and Auto Power radiobeacon acquisition modes,
the AgGPS 122 receiver continuously monitors the integrity of the
data received from the differential radiobeacon(s). If AgGPS 122
detects excessive parity errors in the data stream, the receiver
automati cally switches to a di ffer ent radiobeacon, if one is available.
When the BEACON indicator light flashes twice per second, the
receiver is no longer receiving a usable radiobeacon signal.

AgGPS 122 Operation Manual 1-5

Overview

In Manual acquisition mode, the receiver can only use a single user­defined radiobeacon station frequency.

1.4.2 Part Numbers

Table 1-1 lists the part numbers for the AgGPS 122 product and
options.

Table 1-1. Part Numbers

Description P/N

Ag

GPS 122 product, 1 Hz 29837-00

Optional Parts

10 Hz Upgrade 33176-10
Scorpio Upgrade 33176-20
10-inch, Dual-connection data and power cable 32015
12-foot data interface extension cable 30700
AgGPS 122 to Case AFS cable 32609
TSIP Talker Manual 31889-00
Differential Beacon GPS TSIP Reference 31157-00
Extended hardware warranty - 1 year 30944-21
Extended hardware warranty - 4 years 30944-24
Firmware Update Service - 1 year 30944-11
Firmware Update Service - 4 years 30944-14

The AgGPS 122 product includes a receiver, antenna, magnetic
antenna mount, data cables, operation manual, and software.

1-6 AgGPS 122 Operation Manual