Trimble Outdoors AgGPS 252 GPS receiver

AgGPS 252 Receiver User Guide 43

Troubleshooting 5

GPS receiver

Problem Possible solution

Mounting location

The receiver is not picking up a clear

signal.

Mount the receiver on the centerline of the vehicle,

away from any sources of interference and with a

clear view of the sky (see Choosing a location,

page19).

Cables

One of the cables seems faulty. Use an ohmmeter to check the cable. The resistance

of a good cable between connector pins at each end

of the cable is zero.

If the cable is sound, but the problem persists, try

exchanging the cable with one that you know is

working.

If the cable is defective, contact your local Trimble

Reseller for an RMA number (if the Trimble product

is still under warranty), or to purchase a replacement

cable.

Real-time clock battery

A lithium-ion battery in the receiver

powers the internal real-time clock

and so enables the receiver to get a

first fix faster. The battery has a life

of 7.5 years. When the battery fails,

the internal clock cannot keep

accurate time and the receiver may

take longer to output GPS positions.

Please contact your local Trimble Reseller to get

the batteries replaced. You cannot replace the

battery yourself.

Factory defaults

You need to restore the receiver

factory defaults.

To restore receiver factory default settings:

Connect the receiver to a computer. Turn on the

receiver.

2. Run the AgRemote utility.

3. Navigate to the Clear BB RAM

4. Press 2 until Yes appears.

5. Press 4.

The factory default settings are restored. The DGPS

service subscription is not lost.

Ag252_100B_UserGuide_ENG.book Page 43 Thursday, July 28, 2005 4:06 PM

Contents

Main trimble_support@trimble.com www.trimble.com C Recycling in Europe Page Contents 1 Introduction . . . . . . . . . . . . . . . . . . . . . . .1 2 Overview . . . . . . . . . . . . . . . . . . . . . . . . .3 3 Installing the Receiver. . . . . . . . . . . . . . . . . 17 Page Introduction C Overview Page Page Page Page 2 Overview 8 AgGPS 252 Receiver User Guide Note WAAS/EGNOS and OmniSTAR VBS use the Satellite Differential GPS positioning method. Table 2.1 LED sequences with Satellite Differential GPS or Autonomous positioning Table 2.2 LED sequences with RTK positioning AgGPS 252 Receiver User Guide 9 Overview 2 Table 2.3 LED sequences with OmniSTAR HP positioning Table 2.2 LED sequences with RTK positioning (continued) Page Page Page AgGPS 252 Receiver User Guide 13 Overview 2 Table 2.5 Factors that influence the accuracy of GPS positions 2 Overview 14 AgGPS 252 Receiver User Guide Table 2.5 Factors that influence the accuracy of GPS positions (continued) Page Page Installing the Receiver Page C Page Page Page Page Page AgGPS 252 Receiver User Guide 25 Installing the Receiver 3 Table 3.4 Port B pinout Table 3.3 Port A pinout (continued) Page Configuring the Receiver D/3D 07 DOP03 WAAS 122 04 Page Page Operate in RTK Mode Page AgGPS 252 Receiver User Guide 33 Configuring the Receiver 4 The default port settings are: Table 4.1 Port input settings I RTCM 9600 8N1 0 NMEA 4800 Page Page Troubleshooting 38 AgGPS 252 Receiver User Guide Global Positioning System (GPS) AgGPS 252 Receiver User Guide 39 Troubleshooting 5 40 AgGPS 252 Receiver User Guide Page 42 AgGPS 252 Receiver User Guide Interference AgGPS 252 Receiver User Guide 43 Troubleshooting 5 GPS receiver AgRemote utility FlashLoader 200 upgrade utility Page Page AgGPS 252 Receiver User Guide 47 Ag252_100B_UserGuide_ENG.book Page 47 Thursday, July 28, 2005 4:06 PM START HERE Figure 6.1 Troubleshooting system hardware and power 48 AgGPS 252 Receiver User Guide Ag252_100B_UserGuide_ENG.book Page 48 Thursday, July 28, 2005 4:06 PM R E H AgGPS 252 Receiver User Guide 49 Ag252_100B_UserGuide_ENG.book Page 49 Thursday, July 28, 2005 4:06 PM R E H 50 AgGPS 252 Receiver User Guide Ag252_100B_UserGuide_ENG.book Page 50 Thursday, July 28, 2005 4:06 PM R E H AgGPS 252 Receiver User Guide 51 Ag252_100B_UserGuide_ENG.book Page 51 Thursday, July 28, 2005 4:06 PM START HERE Figure 6.5 Using AgRemote to troubleshoot RTK Page APPENDIX A AgGPS 252 Receiver User Guide 53 Specifications Tabl e A. 1 AgGPS 252 receiver A Specifications TableA.2 lists the performance characteristics of GPS channels. 54 AgGPS 252 Receiver User Guide Table A.2 GPS channels performance Tabl e A. 1 AgGPS 252 receiver (continued) AgGPS 252 Receiver User Guide 55 Receiver Table A.3 L-Band satellite differential correction receiver with OmniSTAR support Table A.2 GPS channels performance (continued) TableA.4 lists the receiver default settings. APPENDIX B AgGPS 252 Receiver User Guide 57 Third-Party Interface Requirements Table B.1 Third-party software interface requirements B Third-Party Interface Requirements TableB.2 lists the interface requirements for connecting an AgGPS receiver to third-party hardware. Table B.2 Third-party h ardware interface require ments Table B.1 Third-party software interface requirements (continued) AgGPS 252 Receiver User Guide 59 Third-Party Interface Requirements B Table B.2 Third-party hardware interface requirements (continued) B Third-Party Interface Requirements 60 AgGPS 252 Receiver User Guide Table B.2 Third-party hardware interface requirements (continued) Index Numerics A B C D E F G H I J L M P R S T U V W Y