Start-Up | Trimble Outdoors AcutimeTM2000 Synchronization Kit

5System Operation

This chapter describes the operating characteristics of the Acutime 2000 GPS smart antenna, including start-up, satellite acquisition, operating modes, serial data communication, and the timing pulse. The Acutime 2000 acquires satellites and computes position and time solutions. It outputs data in the TSIP (or NMEA) protocol through its serial ports.

For more technical information on system operation, see Appendix F, Theory of Operation .

5.1Start-Up

At power-up, the Acutime 2000 automatically begins to acquire and track GPS satellite signals. It typically obtains its first fix in under two minutes.

During the satellite acquisition process, the Acutime 2000 outputs periodic TSIP status messages on Port B. These status messages confirm that the receiver is working.

!Note – The Acutime 2000 has no provision for external backup power and always begins operation from a cold start unless a warm start is forced by uploading almanac data and time.

Acutime 2000 Synchronization Kit User Guide

5-1

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Trimble Outdoors AcutimeTM2000 Synchronization Kit, Part Number 45005-00-ENG manual System Operation, Start-Up

Contents

Acutime 2000 Synchronization Kit Timing and Synchronization Group Software and Firmware License, Limited Warranty Limitation of Liability Contents Acutime 2000 Installation NTP Software Installation and Configuration Trimble Standard Interface Protocol Timing Receiver Monitor Glossary Index List of Figures Page List of Tables List of Tables List of Tables Xvi Acutime 2000 Synchronization Kit User Guide Acutime 2000 Synchronization Kit User Guide Xvii Page Scope and Audience About This Manual Organization Reader Feedback Related Information Update NotesWorld Wide Web WWW Site Document Conventions AbbreviationsTechnical Assistance Page Overview Introduction Acutime 2000 GPS Smart Antenna Features Acutime 2000 GPS Smart Antenna Enclosure Starter Kit Getting Started Connecting the Smart Antenna Connection Diagram Connecting the Computer and Power Source Communicating with the Acutime Acutime 2000 Installation Mounted Antenna Choosing a Location Acutime 2000 Installation Mounting the Smart Antenna Routing and Securing the Interface Cable Connecting the Host System Acutime 2000 Connections Acutime 2000 Interface Connector Interface and Power Connections Acutime 2000 12-pin Connector format Mating Connectors Interface Cables and ConnectorsAntenna Mating Manufacturer Description Connector Pin-Outs Signal Description Wire Color Protocol Acutime ConnectorAcutime 2000 RS-422 Cable Pin-Out Acutime 2000 RS-232 Cable Pin-Out Connection Instructions Power Connection Red and Black WiresTiming Pulse Connections Port B Serial Port Connections Port a Event InputPage Start-Up System Operation Mask Setting Default Satellite Mask SettingsAutomatic Operation Satellite Masks Pdop Mask SNR Mask Tracking Modes Self-Survey Mode Overdetermined Clock Mode PPS Output Options PPS Quantization Error PPS Quantization Error Removing the Quantization Error from the PPS Output External Event Input Cable Delay Compensation Port B Serial Data CommunicationPort a Timing System Operation GPS Timing Timing Operation Timing Pulse Output PPS Using the Acutime 2000 in Mobile Applications Customizing Acutime 2000 Operations OEM Configuration segment Receiver Configuration segmentParameter Factory default Set Request Report PPS Configuration segment Port a and B Configuration segmentPosition Information segment Parameter Factory default Set Request Report Haveutc Nmea Configuration segmentUTC Information segment System Operation Acutime 2000 Synchronization Kit User Guide Network Time Protocol NTP Software Installation and Configuration NTP Time Server Requirements NTP Time Servers Software Sources and Compatibility Installation Support Pre-Installation Check List GPS Preparation Host System Preparation Operating System Specific Information Time Transfer Cable Connection Time Transfer Connection Diagram Optional Connections NTP Software Installation NTP Configuration File NTP Configuration File Unit Number Acutime Configuration Network Server Selection Additional Configuration Information Windows NT Installation Automatic Installation Create the Configuration File Manual Installation NTP Software Installation and Configuration Copying Executable Files Copy NTPQ.EXE, NTPDATE.EXE, NTPDC.EXE, NTPTRACE.EXE Type instsrv c\winnt\system32\ntpd.exe Installing the ServicePage Starting the Service Unix Installation Create the Configuration File Cd /dev Ln -s ttyS0 /dev/Acutime0 Set Up Device Links Hpux System Serial Ports and Symbolic Link Names Disabling Serial Port Services Using an Administrative Tool Hardware Configuration Copying Executable Files System Initialization Start NTP Monitoring NTP Event Log Entries NTP Events on Windows NT NTP Software Installation and Configuration Sample Unix Log Entries Unix System Log Files Ntpq The NTP Query Utility Acutime NTP reference clock is identified in the list as NTP is Communicating with the Acutime NTP Reference Clock No Response from the Acutime NTP Reference Clock NTP is not Running NTP Software Installation and Configuration Interface Scope Trimble Standard Interface Protocol Packet Structure Physical Interface Characteristics Protocol Capabilities NomenclatureTable A-1 Ace UTC Port Translation Table Table A-2 Secondary Port Features Acutime Primary Port FeaturesTable A-3 Secondary Port Features Acutime Event Input Secondary Port Features Ace UTC Packets Output at Power-UpTable A-4 Secondary Port Features Ace UTC Event Reporting Table A-5 Event Packets Table A-7 Receiver Warm Start Commands Table A-6 Packets Output at Power-UpReceiver Warm Start Output ID Description Table A-8 Background Packets Default Background Packets for Acutime Table A-9 Automatic position and Velocity Reports Default Automatic Position and Velocity Reports for Acutime Table A-10 Low-Latency Timing Packets Low-Latency Timing PacketsLltp Packet ID Description Request Packet ID Satellite Data Packets Event PacketsTable A-11 Satellite Data Packets Input ID Description Output ID Table A-12 Customizing Receiver Operations Customizing Receiver Operations Table A-13 Advanced Packets Table A-14 Command Packets Sent to the Receiver Command Packets Sent to the ReceiverInput Packet Description Output ID 8E-AB Table A-15 Report Packets Sent by GPS Receiver to User Report Packets Sent by the GPS Receiver to the UserOutput ID Packet Description Input ATrimble Standard Interface Protocol 8F-AD DLE id data string bytes DLE ETX Packet Structure Table A-17 Command Packet 1D Set Oscillator Offset Table A-16 Command Packet 1D Clear Oscillator OffsetPacket Descriptions Oscillator Offset Table A-18 Command Packet 1E Initiate Cold or Factory Reset0x1E Command Packet 1E 0x1F Command Packet 1F Table A-19 Command Packet Initial Position XYZ Cartesian Ecef Command0x20 0x21 0x23 Almanac Request Initiate Soft Reset / Self Test Command GPS Receiver Position Fix Mode Request0x24 0x25 Health Request Altitude for 2-D Mode Command Signal Levels Request0x27 0x28 0x29 0x2A GPS System Message Request Trimble Standard Interface Protocol Table A-20 Command Packet 2B Initial Position Latitude, Longitude, Altitude Command0x2B 0x2D Oscillator Offset Request Accurate Initial Position XYZ Cartesian Ecef Command GPS Time CommandTable A-21 Command Packet 2E 0x2E 0x2F 0x31 Trimble Standard Interface Protocol 0x32 0x34 Satellite Number For One-Satellite Mode Command 0x35 Command Packet Option Flags Command Table A-22 Command Packet Byte Bytes Trimble Standard Interface Protocol Byte Last Position and Velocity Request 0x37 0x38Download and UpLoad Satellite System Data Byte Type Value Meaning Table A-23 Command Packet Table A-24 Command Packet Satellite Attribute Database Command0x39 Command Packet Table A-26 Command Packet 3B Table A-25 Command Packet 3ALast Raw Measurement Request Satellite Ephemeris Status Request 0x3C Command Packet 3C Table A-27 Command Packet 3CSatellite Tracking Status Request Eeprom Segment Commands Timing Port Configuration CommandTable A-28 Command Packet 3F-11 Almanac Data Page Report GPS Time Report 0x41Table A-30 Report Packet Report Packet Approximate Time Time Source Sign Packet Accuracy Table A-31 Relationship Between Packet 41 and PacketStatus Code Table A-32 Report Packet Single-Precision Position Fix, XYZ Ecef Report0x42 Report Packet Table A-33 Report Packet Velocity Fix, XYZ Ecef Report0x43 Report Packet Table A-34 Report Packet Software Version Information Report0x45 Report Packet Byte Type Table A-35 Report Packet Health of Receiver Report0x46 Report Packet Table A-36 Report Packet Error Code Meaning if bit value = Bit Position 0x47 0x48 Signal Levels for all Satellites ReportGPS System Message Report Table A-37 Report Packet Almanac Health Page Report 0x49 0x4ATable A-38 Report Packet Table A-39 Report Packet 4A Report Reference Altitude Latitude Table A-41 Report Packet 4B Machine/Code ID and Additional Status ReportTable A-42 Byte 1 Bit Encoding Status Operating Parameters Report Byte Type, Units Default Value, VelocityTable A-43 Report Packet 4C 0x4C Report Packet 4C GPS Time Change Acknowledgment 0x4D 0x4ETable A-44 Report Packet 4E Table A-45 Report UTC Parameters UTC Parameters Report0x4F Report Packet 4F Byte Value Type Option Flags Report Bias and Bias Rate ReportTable A-46 Report Packet 0x54 Report Packet Table A-47 0x56 Velocity Fix, East-North-Up ENU Report Velocity Fix, East-North-Up ENU Report0x56 Report Packet Table A-48 Report Packet Information About Last Computed Fix Report0x57 Report Packet Byte Type/Units Value Table A-49 Report Packet Satellite System Data/Acknowledge from Receiver0x58 Report Packet Byte Type Meaning Table A-50 Report Packet 58 Almanac Data Report Table A-52 Report Packet 58 Ionosphere Data Report Table A-51 Report Packet 58 Almanac Health Data Report Table A-54 Report Packet 58 Ephemeris Data Report Table A-53 Report Packet 58 UTC Data Report Iode Byte Table A-55 Report Packet Satellite Attributes Database Report0x59 Report Packet Raw Measurement Data Report 0x5ATable A-56 Report Packet 5A Report Packet 5A Codephase Signal levelDoppler Time of measurement Satellite Ephemeris Status Report0x5B Report Packet 5B Table A-57 Report Packet 5B Table A-58 Report Packet 5C Satellite Tracking Status Report0x5C Report Packet 5C Byte/Item Type/Units Value/Meaning Approximate elevation of this satellite Eeprom Segment Status Reports 0x5F-11Table A-59 Report Packet 5F-11 Eeprom Segment Status Report Report Packet 5F-11 Type 1 Differential GPS Corrections 0x60 Command PacketTable A-60 Report Packet 0x60 Data Formats Byte Bit Type Range Units SV PRN Byte Bit Type Value Definition 0x61 Command Packet Table A-62 Command Packet 0x61 Data FormatsSet Differential GPS Corrections Table A-63 Report Packet 6D All-In-View Satellite Selection Report0x6D Report Packet 6D 0x7A Command Packet 7A Table A-64 Command Packet 7ASet or Request Nmea Interval and Message Mask Nmea Message Output 0x7B 0x83Double-precision XYZ Position Fix And Bias Information Table A-65 Report Packet Table A-66 Report Packet Double-precision LLA Position Fix and Bias Information0x84 Report Packet Table A-67 Survey State Configurations Set Primary Receiver Configuration0xBB Command Packet BB Survey State Active Configuration Dynamics Code Table A-68 Vaild GPS Configuration Settings Signal Level Mask Command Packet BB Table A-69 Pdop Mask and SwitchByte # Type Value Meaning Default Table A-69 Command Packet BB Set Port Configuration Parameters Report Receiver ConfigurationTable A-70 Command Packet BC 0xBC Command Packet BC 0xBC Report Packet BC Request Port Configuration Parameters Tsip Superpackets Custom OEM Packets Command Packet 8E-0B Request or Configure Super Packet Output0x8E-0B Command Packet 8E-14 Table A-71 Command Packet 8E-140x8E-14 Set New Datum Command Packet 8E-15 Table A-72 Command Packet 8E-140x8E-15 Request Current Datum Values 0x8E-26 0x8E-200x8E-41 Table A-74 Command Packet 0x8E-45 Revert Segments to Default Settings0x8E-42 0x8E-45 Table A-75 Command Packet 8E-4A Set/Request PPS CharacteristicsCommand Packet 8E-4A 0x8E-4A Command Packet 8E-4D Table A-76 Command Packet 8E-4D0x8E-4D Automatic Packet Output Mask Bit # Output Default When Meaning Packets Table A-77 Command Packet 8E-4D Packets Affected By Bits 0x8E-4E Command Packet 8E-4ESet PPS Output Option 0x8E-A5 0x8E-4FSet PPS Width Set or Request Packet Broadcast Mask Trimble Standard Interface Protocol Byte Bit Type Default Description Table A-80 Command Packet 8E-A5 0x8E-A6 Issue Self-Survey Command0x8E-A9 Set Self-Survey Parameters Table A-82 Command Packet 8E-A9 Data Format segmentByte Type Value Description Command Packet 8E-AB Table A-83 Command Packet 8E-AB0x8E-AB Request Primary Timing Packet Command Packet 8E-AC Table A-84 Command Packet 8E-AC0x8E-AC Request Supplemental Timing Packet 0x8E-AD Command Packet 8E-AD Acutime 2000 only Comprehensive Time 0x8F-0BTable A-85 Report Packet 8F-0B Report Packet 8F-0B 38-41 Oscillator Drift Current Datum Values 0x8F-14Table A-86 Report Packet 8F-14 Report Packet 8F-14 Last Fix with Extra Information binary fixed point 00x8F-20Table A-87 Report Packet 8F-20 Report Packet 8F-20 Bytes Item/Type Meaning 32-47 Table A-88 Report Packet 8F-20 Response to Save Eeprom Segments 0x8F-26Table A-89 Report Packet 0x8F-26 Report Packet 0x8F-26 Manufacturing Parameters 0x8F-41Table A-90 Report Packet 8F-41 Report Packet 8F-41 0x8F-45 0x8F-42Table A-91 Report Packet 8F-42 Report Packet 8F-42 Command Packet 8E-AD Request 8F-AD Table A-92 Command Packet 8E-ADByte # Type Value Default Meaning 0x8F-4A PPS CharacteristicsTable A-93 Report Packet 8F-4A Report Packet 8F-4A 0x8F-4D Bit # Output When Output Meaning PacketsTable A-94 Report Packet 8F-4D Table A-95 Report Packet 8F-4D 0x8F-A5 0x8F-4EReport Packet 0x8F-4E Report Packet 8F-A5 0x8F-A9 0x8F-A60x8F-AB 116 Acutime 2000 Synchronization Kit User Guide UTC Integer Table A-96 Report Packet 0x8F-AB Report Packet 8F-AC 0x8F-AC Acutime 2000 Synchronization Kit User Guide 119 120 Acutime 2000 Synchronization Kit User Guide GPS Byte Table A-97 Report Packet 8F-AC Reserved 16-19 Bias Primary UTC Time 0x8F-ADTable A-98 Report Packet 8F-AD Report Packet 8F-AD Flag Value Status Meaning Table A-99 Tracking Status Flag Definitions Leap Second Flag Table A-100 Leap Second Flag DefinitionsBit # Name Meaning if set to Table A-101 Datums DatumsIndex Axis Eccentricity Description Acutime 2000 Synchronization Kit User Guide 127 128 Acutime 2000 Synchronization Kit User Guide Acutime 2000 Synchronization Kit User Guide 129 130 Acutime 2000 Synchronization Kit User Guide Acutime 2000 Synchronization Kit User Guide 131 132 Acutime 2000 Synchronization Kit User Guide Acutime 2000 Synchronization Kit User Guide 133 Sample Tsip Routines Sending out Tsip command packet 0x1F Acutime 2000 Synchronization Kit User Guide 135 Handling incoming Tsip packet Acutime 2000 Synchronization Kit User Guide 137 Page Timing Receiver Monitor Main screen Nmea Signal Characteristic Nmea Standard Table C-1 Nmea 0183 CharacteristicsNmea 0183 Communication Interface Nmea 0183 Message Format Each message contains multiple data fields Dn Nmea 0183 Message Options Setting Message DescriptionTable C-2 Acutime 2000 Nmea Messages GGA GPS Fix Data Nmea 0183 Message FormatsTable C-3 GGA GPS Fix Data Message Parameters Field Description Field # Description GLL Geographic Position Latitude/Longitude GSA GPS DOP and Active Satellites Table C-6 GSV GPS Satellites in View Message Parameters GSV GPS Satellites in View RMC Recommended Minimum Specific GPS/Transit Data VTG Track Made Good and Ground Speed Table C-9 ZDA Time & Date Message Parameters ZDA Time & Date Nmea Acutime 2000 Synchronization Kit User Guide Table D-1 Physical Specifications Acutime 2000 GPS Smart Antenna SpecificationsDimensions Weight Table D-3 Performance Specifications Table D-2 Environmental Specifications Table D-4 Electrical Specifications Table D-5 Serial Protocols Port Interface Protocols Defaults Acutime 2000 Standard Interface Cable Diagram Figure D-1 Acutime 2000 Standard Interface Cable Figure D-2 NTP Interface Cable Specifications and Drawings System Log Entries Diagnostics and Debugging Serial Port Acces Report Configuration File Not Found Error Log Entries Acutime 2000 Synchronization Kit User Guide Acutime Configuration Failure COM Port Unavailable System Clock Not Set Running NTP in Debug Mode NTP Startup and Acutime Poll Debug Mode Not Available NTP Diagnostics and Debugging Acutime is not Responding Table E-1 Troubleshooting Acutime is Not Responding Running NTP with Event Polling DisabledPossible Problem Solution Fudge 127.127.127.x flag2 Palisadepoll unit x polling synchronous packet Incorrect Port and Bad Data Table E-2 Troubleshooting Incorrect Port and Bad Data Serial Port is Unavailable Compiling the NTP Distribution NTP Diagnostics and Debugging NTP Diagnostics and Debugging NTP Diagnostics and Debugging Controlling the NTP Service Removing the NTP Service Windows NT Administration Type instsrv remove Additional Information Page Theory of Operation GPS Satellite Message Cold Start Satellite Acquisition and Time to First Fix Warm Start Hot Start Garage Search Strategy Selective Availability S/A Position Accuracy Tsip Coordinate SystemsNmea Update Rate Performance CharacteristicsDynamic Limits Re-Acquisition Theory of Operation Figure F-2 System Architecture Figure F-1 Acutime 2000 Block Diagram RS-232 Version Page Glossary Ascii DCE DOP Elevation mask Gdop GPS Iode Pdop ROM SEP SPS Index Index-2 Acutime 2000 Synchronization Kit User Guide Index-3 Index-4 Acutime 2000 Synchronization Kit User Guide Reader Comment Form