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NorthStar 2505 Installation Manual

Beacon/waas position sensor
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Northstar Technologies
30 Sudbury Road
Acton, Massachusetts 01720
2505 Beacon/WAAS
Position Sensor
Installation Manual
Part Number GM2505
Revision A
800/628-4487
978/897-6600
www.northstarcmc.com

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Summary of Contents for NorthStar 2505

  • Page 1 2505 Beacon/WAAS Position Sensor Installation Manual Northstar Technologies 30 Sudbury Road Acton, Massachusetts 01720 Revision A Part Number GM2505 800/628-4487 978/897-6600 www.northstarcmc.com...
  • Page 3 Call the Northstar dealer or Northstar for instructions. During the unit’s warranty period, Northstar will repair or replace, at its option, any part of the unit it finds to be defective due to faulty material(s) or workmanship. All such repairs and/or replacements will be promptly performed by Northstar free-of-charge to the owner, excluding freight costs incurred in shipping to the factory.

  • Page 5: Table Of Contents

    SECTION TWO Installing and interfacing the 2505 ........
  • Page 6 Page ii 2505 INSTALLATION MANUAL, Revision A...

  • Page 7: List Of Figures

    Figure 1: 2505 case and mounting dimensions ........
  • Page 8 Page iv 2505 INSTALLATION MANUAL, Revision A...

  • Page 9: List Of Tables

    Table 4: 2505 alternate connector pinouts ........
  • Page 10 Page vi 2505 INSTALLATION MANUAL, Revision A...

  • Page 11: Section One Introducing The 2505

    Manual describes how to properly mount, interface, and troubleshoot the Northstar 2505 and Northstar AN205-P combination GPS/beacon antenna. Also described are the 2505’s configuration options, the physical, mechanical, and electrical characteristics, and the serial protocol used to communicate with a host device.

  • Page 12: Getting Technical Support

    U.S. mail, or phone as described in Table 1 below. You can also visit Northstar’s website for additional service-related information. Please have the 2505’s serial number available and be as complete and accurate as possible when describing the problem. This ensures that a Northstar service technician can research the issue and provide the quickest possible response.

  • Page 13: Servicing The Northstar 2505

    For 2505’s still under warranty, field repairs are not authorized and will void the warranty! For a 2505 under warranty, shipping charges to the factory are the only cost for factory repair. The repaired 2505 will be returned via prepaid economy ground freight (freight for units returned overseas is chargeable).

  • Page 14: Returning A 2505 For Service

    Page 4 The 2505 is covered by a two-year hardware-only warranty, which, in summary, states that if the 2505 is returned to the Northstar factory by the owner or dealer during the warranty period, Northstar will repair or replace, free of charge, any part found to be defective due to faulty materials or workmanship if the system has been properly installed and hasn’t been abused.
  • Page 15 2505 INSTALLATION MANUAL, Revision A need to see it, touch it, or send commands to it. By eliminating virtually all of the attention needed to operate the 2505, you can devote more time to other aspects of your work. The 2505 receives differential WAAS corrections from strategically located ground-based transmitters called beacons, as well as from satellites transmitting WAAS differential signals.
  • Page 16 The nine operating modes are described in detail below. Self-test mode The 2505 enters the self-test mode upon a host’s request, using an NMEA message, via the GPS primary port, using either RS-232 or RS-422. This test requires no more than 15 seconds.
  • Page 17 When a sufficient number of satellites are being tracked, then position, velocity and time are computed, and the 2505 enters navigation mode. If the 2505 can’t acquire signals normally due to an absence of valid almanac data, it initiates a “Search the Sky”...
  • Page 18 This is the navigation mode with the highest performance when differential 3-D mode can’t be used. 3-D nav The 2505 operates in 3-D nav mode when it receives data from at least four satellites with adequate geometry, but no differential corrections. This is the preferred navigation mode when sufficient WAAS or radiobeacon corrections aren’t...
  • Page 19 2505 INSTALLATION MANUAL, Revision A Fault mode The 2505 enters fault mode if it determines that its outputs are affected by one or more critical system faults. This mode supersedes all others and remains active until the next power-down/power-up cycle. Fault mode can be entered from any other mode, except initialization, whenever an unrecoverable fault is detected.
  • Page 20 SECTION ONE Introducing the 2505 Page 10 2505 INSTALLATION MANUAL, Revision A...

  • Page 21: Section Two Installing And Interfacing The 2505

    Check the shipping carton for any damage, and immediately report any damage to the carrier. Save all packing material in case you have to return the 2505 to the factory for repair or evaluation. Unpack the carton, and compare its contents with those on the packing list and what you ordered.
  • Page 22 13. Install the antenna; see ”Installing the AN205-P antenna” on page 15. Wire the 2505 to power; for details, see ”Connecting the 2505 to power” starting on page 14. Interface the 2505 to the desired device; see ”Interfacing the 2505” on page 17. If you experience any operating problems, see ”Troubleshooting the installation”...

  • Page 23: Installing The 2505

    You can mount the 2505 horizontally or vertically, using the appropriate mounting holes; see Figure 1 on page 14. Keyhole slots at the rear will help if you’re installing the 2505 where access is limited and it may be difficult to start the mounting screws at the obstructed end.
  • Page 24 Be sure to ground the equipment to prevent electrical shock and mutual interference. Be sure that the power supply’s voltage is compatible with the 2505’s voltage rating (10 to 40 volts DC). Connecting to the wrong power supply can result in fire or damage to equipment.

  • Page 25: Installing The An205-P Antenna

    The power supply is protected against reverse-polarity power inputs. The 2505 has an internal ½-amp fuse. The 2505 can be turned on remotely. If you connect pin 12 to a switched source of +5 to +40 volts DC, the 2505 will turn on whenever that voltage source is applied.
  • Page 26 When connecting the antenna to the 2505, you can use the supplied coaxial cable or fabricate your own. In either case, the cable length must be a maximum of 50 feet. (Using a cable longer than 50 feet will require an antenna with a higher gain;...

  • Page 27: Interfacing The 2505

    Pins 6, 7, 8, 12, 13, and 25 (in bold type) are the minimum connections required to operate the 2505. Choose either RS-422 or RS-232 pins as required by the equipment to which you’re interfacing. For input/output options, see “Appendix A Technical specifications”...

  • Page 28: Troubleshooting The Installation

    Page 18 If you’re experiencing operating difficulties, perform the following troubleshooting steps: • Verify the integrity of the coaxial connections at the 2505 and at the antenna. • To improve intermittent signal reception and performance, look for loose connector crimps and unsecured cable connections at the 2505 and at any equipment to which the 2505 is interfaced.

  • Page 29: Appendix A Technical Specifications

    Table 4: 2505 technical specifications General characteristics L1 frequency Coarse acquisition Sensitivity DGPS software Performance characteristics Velocity Acceleration Position accuracy 2505 INSTALLATION MANUAL, Revision A Appendix A Technical specifications 1,575.42 MHz C/A code (1.023 MHz chip rate), code and carrier phase tracking...
  • Page 30 Appendix A Technical specifications Table 4: 2505 technical specifications (continued) Time-To-First-Fix (TTFF) Re-acquisition time Channels allocation Interface characteristics Primary power Serial communications Input messages Output messages Physical characteristics Dimensions Weight Environmental characteristics Operating temperature Humidity Page 20 Hot start: 20 seconds typical, with current almanac, position, time,...

  • Page 31: Appendix B Data Characteristics

    I/O connector. RS-422 and RS-232 outputs may be used simultaneously; however, in general, only one of the two receiver inputs for a particular port should be connected. The available 2505 signals and I/O ports are shown in Table 5 on page 22. Page 21...
  • Page 32 Appendix B Data characteristics Page 22 Table 5: 2505 signals and I/O ports I/O ports RS-232 receiver 1 input RS-232 receiver 2 input RS-232 receiver 3 input (optional) RS-422 receiver 1 input (A/B) RS-422 receiver 2 input (A/B) RS-232 transmitter 1 output...

  • Page 33: Appendix Cnmea Output Protocol

    GPS receiver’s NMEA message format 2505 INSTALLATION MANUAL, Revision A Appendix C NMEA output protocol his appendix includes information about the NMEA message format for the GPS receiver, as well as input and output sentences. This section describes the serial protocol used by the GPS receiver to communicate with a host device.
  • Page 34 (1st field = message identifier interface ID (G = GPS) originator ID (MCA = Canadian Marconi Company) Special ID P = Proprietary Record sync character The types of fields are defined in Table 6 on page 25. 2505 INSTALLATION MANUAL, Revision A...
  • Page 35 Fields Variable text c--c Fixed alpha aa_____ field 2505 INSTALLATION MANUAL, Revision A Table 6: NMEA field definitions Definition Special format fields Single character field: A = Yes, Data Valid, Warning Flag Clear V = No, Data Invalid, Warning Flag Set Fixed/Variable length field: Degrees/minutes.decimal - 2 fixed digits of degrees, 2 fixed...

  • Page 36: Input Sentences

    The following sections define the valid input and output sentences available on the primary port. Table 7 lists all valid input sentence types for the GPS receiver. Detailed descriptions of each sentence are given in the sections that follow. Maximum sentence length (characters) 2505 INSTALLATION MANUAL, Revision A...

  • Page 37: Configure Primary Port Command

    Configure primary port command 2505 INSTALLATION MANUAL, Revision A This message is used to change the primary port mode. Once this command is issued to the GPS receiver, the controller supporting the Monitor mode protocol is activated, then NMEA communications with the GPS receiver can be restored only by using binary message #110.

  • Page 38: Initialization Data Command

    09/07/1995 Time 16:37:21 Reserved Must be 00 Local zone minutes Must be 00 Latitude 53 01.97' North Longitude 1 33.48' East Altitude 35.35 m above mean sea level Reserved No character 2505 INSTALLATION MANUAL, Revision A reserved altitude longitude-E/W latitude-N/S...

  • Page 39: Initiate Self-Test Command

    Initiate self-test command Request output message command 2505 INSTALLATION MANUAL, Revision A This message will request a complete self-test of the GPS receiver. Results of the self-test will be automatically output (output message 902) on the primary output port at completion of the self-test sequence.

  • Page 40: Set Output Configuration Command

    GGA and ZDA transmitted every 10 seconds RMC and VTG transmitted every second at 4800 baud $PMCAG,005,1,GLL,001*2A<CR><LF> output messages: GGA and ZDA transmitted every 10 seconds GGL, RMC and VTG transmitted every second at 4800 baud GLL saved in NVM 2505 INSTALLATION MANUAL, Revision A...

  • Page 41: Switch To Reprogramming Mode Command

    Switch to reprogramming mode command 2505 INSTALLATION MANUAL, Revision A HEADER CONTENTS OF DATA FIELDS $PMCAG,006,xx.x*hh<CR><LF> baud rate Baud rate: valid baud rates: 0.3, 0.6, 1.2, 2.4, 4.8, 9.6, 19.2 or 38.4 (in kBd units). Example: $PMCAG,006,19.2*7A<CR><LF> Appendix C NMEA output protocol...

  • Page 42: Erase Non-Volatile Memory

    Position Time DGPS configuration Default NMEA message list RS-232 configuration 1. This command will force the 2505 to go into BSC binary mode, at 9600 baud, at the next power-up. Example: $PMCAG,007,15*6B<CR><LF> Erases configuration of the primary port and BSC binary message list transmitted by default after each power-up.
  • Page 43 MSK,x.x,a,x.x,a,x.x*hh<CR><LF> Status request: When status data I not to be transmitted, this field is “null.” 2505 INSTALLATION MANUAL, Revision A This message is used to configure the set the frequency and bit rate parameters of the radiobeacon and also to set the rate of the output message MSS and $PMCAG,903.

  • Page 44: Output Sentences

    Table 9 below lists all valid output sentence types for the GPS receiver. Detailed descriptions of each are given in the following sections. Maximum sentence length (chars) 3*70 2505 INSTALLATION MANUAL, Revision A Rate Adjustable On request Adjustable (via MSK) Adjustable Adjustable...

  • Page 45: Navigation Status

    Navigation status 2505 INSTALLATION MANUAL, Revision A This message provides the current navigation mode and GPS fix quality indicator. HEADER CONTENTS OF DATA FIELDS $PMCAG,900,ccc,c*hh<CR><LF> GPS fix quality indicator navigation mode Navigation mode: 3-D fix with differential aiding 3-D fix...

  • Page 46: Data Request List Overflow

    Appendix C NMEA output protocol Data request list overflow Page 36 This message is returned when more than eight data requests are pending. HEADER CONTENTS OF DATA FIELDS $PMCAG,901*hh<CR><LF> Example: $PMCAG,901*4C<CR><LF> 2505 INSTALLATION MANUAL, Revision A...

  • Page 47: Self-Test Results

    CONTENTS OF DATA FIELDS $PMCAG,902,xxxxxx,xxx,a,aaaa,xx,xx*hh<CR><LF> Sensor self-test result from the last initiated test (PASS, FAIL) 2505 INSTALLATION MANUAL, Revision A Result of the GPS sensor self-test. This message is automatically output in response to an initiated self-test request (see input message identifier 003).

  • Page 48: Radiobeacon Proprietary Info

    (shall be null) reserved (shall be null) reserved (shall be null) reserved (shall be null) software part number (root number) radiobeacon self-test result impulse noise count antenna fault default battery-backed RAM invalid reserved Example: $GPCAG,903,6,,2.24,0,0,0,0*62<CR><LF> 2505 INSTALLATION MANUAL, Revision A...

  • Page 49: Global Positioning System Fix Data

    Geoidal separation: the difference between the WGS-84 earth ellipsoid and mean-sea-level (geoid); if negative, mean-sea-level is below ellipsoid Time (in seconds) since last SC104 Type 1 or 9 update; empty field when DGPS is not used $GPGGA,012338.61,5619.2837,N,17235.8964,E,1,05,02.3,-00034.2,M,,M,,*66<CR><LF> 2505 INSTALLATION MANUAL, Revision A HDOP SVs in use Example: 01:23:38.61 Latitude 56 19.2837' North...
  • Page 50 Latitude and longitude of present position, time of position and status. status UTC of position E/W—East or West longitude N/S —North or South latitude Example: $GPGLL,5619.2837,N,17235.8964,E,012338.61,A*0C<CR><LF> Latitude: 56 19.2837' North Longitude: 172 35.8964' East UTC: 01:23:38.61 Status: Valid Data 2505 INSTALLATION MANUAL, Revision A...

  • Page 51: Gps Dop And Active Satellites

    Mode: M = manual, forced to operate in 2-D or 3-D mode A = automatic, allowed to automatically switch 2-D/3-D 2505 INSTALLATION MANUAL, Revision A Operating mode, satellites used for navigation and DOP values from GPS sensor. PRNs of SVs used...

  • Page 52: Gps Satellites In View 3*70

    1 to 3 total number of messages, 1 to 3 Examples: Messages Msg. No. SV Visible Elevation Azimuth 6 dB Elevation Azimuth 15.5 dB Elevation Azimuth Not tracked Elevation Azimuth 12.3 dB 2505 INSTALLATION MANUAL, Revision A...
  • Page 53 2505 INSTALLATION MANUAL, Revision A $GPGSV,2,2,06,15,23,187,8.2,17,35,323,11.1,,,,,,,,*4D<CR><LF> Messages Msg. No. SV Visible Elevation Azimuth 8.2 dB Elevation Azimuth 11.1 dB Appendix C NMEA output protocol Page 43...

  • Page 54: Mss Radiobeacon Receiver Signal Status

    (beacon) receiver. This message will be transmitted at the rate set in the message $GPCAG,MSK. beacon bit rate (25, 50, 100, 200) bits per second radiobeacon frequency, 285.5 to 325.0 kHz signal-to-noise ration (SNR), dB signal strength (SS), dB re: 1 uv/m Example: $GPMSS,32,13,288.0,100,*68<CR><LF> 2505 INSTALLATION MANUAL, Revision A...

  • Page 55: Recommended Minimum Specific Gps Data

    2 digits of degrees, 2 digits of minutes, 4 digits of decimal fraction of minutes Status: A = data valid V = nav receiver warning. $GPRMC,224512.45,G,2518.3847,S,08339.8367,E,003.8,311.5,080793,,*2E<CR><LF> 2505 INSTALLATION MANUAL, Revision A Time, date, position, course and speed data. E/W—East or West longitude N/S—North or South latitude...

  • Page 56: Track Made Good And Ground Speed

    Actual track made good and speed relative to the ground. km/hr speed knots speed degrees true track Example: Track made good and ground speed data sentence. $GPVTG,234.6,T,,,075.3,N,139.5,K*21<CR><LF> Track 234.6 from North Speed 75.3 knots Speed 139.5 km/hr 2505 INSTALLATION MANUAL, Revision A...

  • Page 57: Utc Time And Date And Local Time Zone

    Zone description is the number of whole hours added to local time to obtain UTC; zone description is negative for East longitudes (00...±13 hours) Local zone minutes (00...59); same sign as local hours 2505 INSTALLATION MANUAL, Revision A UTC time, date and local time zone. local zone minutes description...
  • Page 58 Appendix C NMEA output protocol Page 48 2505 INSTALLATION MANUAL, Revision A...

  • Page 59: Glossary

    Carrier to Noise Density Ratio. Canadian Marconi Company. Distance Root Mean Square. Electrically Erasable Programmable Read Only Memory. Horizontal Dilution of Precision. Customer system receiving position data from the 2505. The frequency band used by the GPS sensor, 1575MHz. Page 49...
  • Page 60 The communication specification for differential corrections format. The type of connector used by the GPS antenna. Time To First Fix. Vertical Dilution of Precision Wide Area Augmentation System (differential corrections via geostationary satelliteS) World Geodetic System—1984 (datum) 2505 INSTALLATION MANUAL, Revision A...

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