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2505 Beacon/WAAS

Position Sensor

Installation Manual

Revision A

Part Number GM2505

Northstar Technologies
30 Sudbury Road
Acton, Massachusetts 01720

800/628-4487
978/897-6600

www.northstarcmc.com

Summary of Contents for 2505

Page 1: ...2505 Beacon WAAS Position Sensor Installation Manual Revision A Part Number GM2505 Northstar Technologies 30 Sudbury Road Acton Massachusetts 01720 800 628 4487 978 897 6600 www northstarcmc com ...

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Page 3: ... the owner To be covered by this warranty the Northstar equipment must have been in normal use This war ranty does not apply to units with defects caused by improper installation physical damage abuse tampering lightning or other abnormal electrical discharge or to units with defaced or altered serial numbers or to units repaired by unauthorized persons or repaired in a manner that violates North ...

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Page 5: ...2505 for service 4 Introducing the 2505 4 SECTION TWO Installing and interfacing the 2505 11 Before installing the 2505 11 Installing the 2505 13 Installing the AN205 P antenna 15 Interfacing the 2505 17 Troubleshooting the installation 18 Appendix A Technical specifications 19 Appendix B Data characteristics 21 Input output ports 21 Appendix C NMEA output protocol 23 GPS receiver s NMEA message f...

Page 6: ...Page ii 2505 INSTALLATION MANUAL Revision A ...

Page 7: ...2505 INSTALLATION MANUAL Revision A Page iii List of Figures Figure 1 2505 case and mounting dimensions 15 Figure 2 Northstar GPS DGPS combo antenna 16 ...

Page 8: ...Page iv 2505 INSTALLATION MANUAL Revision A ...

Page 9: ...Standard connector pinouts 17 Table 4 2505 alternate connector pinouts 18 Table 5 Sensor signals and I O ports 23 Table 6 Standard configurations 24 Table 7 Connector pin assignments 26 Table 8 NMEA field definitions 31 Table 9 Primary port input messages 32 Table 10 NVM elements 38 Table 11 Primary port output sentences 40 ...

Page 10: ...Page vi 2505 INSTALLATION MANUAL Revision A ...

Page 11: ...are the 2505 s configuration options the physical mechanical and electrical characteristics and the serial protocol used to communicate with a host device Who should read this manual This manual is intended for installation technicians who are installing connecting and troubleshooting the 2505 Scope of this manual In this manual you ll find information about the following the 2505 s operating mode...

Page 12: ... issue and provide the quickest possible response Northstar s Service Department is available between 9 00 AM and 5 00 PM Eastern Time Monday through Friday excluding major holidays If you re looking for an authorized Northstar dealer or product information and brochures contact the Northstar Sales Department You can email the Northstar Service Department directly from Northstar s website www nort...

Page 13: ... valuable resource for all installation technicians Send your questions comments or suggestions about this manual to manuals northstarcmc com Ordering parts To order spare replacement or missing parts call the Northstar Sales Department at 978 897 0770 or 800 628 4487 Servicing the Northstar 2505 The 2505 is repaired only by authorized Northstar dealers or the Northstar factory Service includes a ...

Page 14: ...A 01720 USA Introducing the 2505 Northstar s 2505 Beacon WAAS Position Sensor comprises a high performance fully automatic 12 channel GPS WAAS receiver and a two channel beacon receiver packaged together into a self contained ruggedized enclosure The 2505 provides accurate GPS position data worldwide in any weather 24 hours a day for such applications as soil sampling yield monitoring field mappin...

Page 15: ...the end user via minimal shift keyed 300 kHz U S Coast Guard beacons ground based WAAS differential As with the Coast Guard radiobeacons the Wide Area Augmentation System WAAS satellites use surveyed reference stations to monitor GPS signals from each visible satellite and determine if errors exist and then develop corrections However unlike Coast Guard radiobeacons or other land based transmitter...

Page 16: ...titude Hold WAAS beacon differential Dead reckoning Fault The 2505 automatically switches between modes and reports the current operating and navigation modes through its host port 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 requi...

Page 17: ...lid almanac data it initiates a Search the Sky acquisition attempting to acquire any and all satellites in the GPS constellation After a satellite has been acquired ephemeris data is decoded from the satellite down link message In Search the Sky the Time To First Fix TTFF is typically less than two minutes After a sufficient number of satellites have been acquired the 2505 enters navigation mode F...

Page 18: ...acon corrections aren t available WAAS beacon differential mode While beacon and GPS acquisition is occurring the 2505 s GPS receiver is simultaneously searching for and acquiring the WAAS differential signal from a geostationary satellite that operates in the same frequency band as the GPS satellites To avoid conflict WAAS uses special PRN satellite identification numbers Once the WAAS signal has...

Page 19: ... receiver Channel 2 continuously scans the entire beacon frequency band 283 5 to 325 kHz locating and measuring received DGPS beacon signals The 2505 then stores this information as a DGPS beacon directory in battery powered memory If the signal received and monitored by Channel 1 degrades for any reason the 2505 selects a better frequency from its beacon memory This lets the 2505 switch to the be...

Page 20: ...SECTION ONE Introducing the 2505 Page 10 2505 INSTALLATION MANUAL Revision A ...

Page 21: ...ore installing the 2505 As shipped the 2505 is ready to install and operate 1 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 2 Unpack the carton and compare its contents with those on the packing list and what you ordered Table 2 on page 12 lists the part...

Page 22: ...Mounting the 2505 starting on page 13 7 Install the antenna see Installing the AN205 P antenna on page 15 8 Wire the 2505 to power for details see Connecting the 2505 to power starting on page 14 9 Interface the 2505 to the desired device see Interfacing the 2505 on page 17 If you experience any operating problems see Troubleshooting the installation on page 18 Table 2 2505 parts list Part number ...

Page 23: ...rectly or enter it by following power or antenna cables Use drip loops on all cables Tie wrap all cables to keep them secure and if cables are shortened lengthened or re terminated seal all wiring splices Mounting 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 ...

Page 24: ...s 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 CAUTION Before applying power to the 2505 double check all the wiring A small but significant number of units sustain damage due to incorrectly wired connections Such damage is not covered under warranty Be sure you don t apply primary voltage directly to any...

Page 25: ...As long as power is connected to pin 25 the 2505 will remain on For remote turn on by the host device connect pin 12 to any host switched 5V to 40 volts DC output of the GPS host In this configuration the 2505 will turn on or off whenever the host device is turned on or off Installing the AN205 P antenna The 2505 operates exclusively with Northstar s AN205 P combination GPS DGPS antenna This combo...

Page 26: ...g terminal is securely connected to vehicle ground Wiring the antenna 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 contact Northstar for details Don t make any tight bends and fasten the cable along its len...

Page 27: ...cols see Appendix C NMEA output protocol on page 23 Table 3 Standard connector pinouts Pin Description Pin Description 1 BDM control input A RS 422 14 BDM control input B RS 422 2 Ground 15 GPS primary input A RS 422 3 GPS primary input B RS 422 16 BDM RTCM SC 104 output A RS 422 4 BDM RTCM SC 104 output B RS 422 17 Ground 5 GPS primary output A RS 422 18 GPS primary output B RS 422 6 GPS primary ...

Page 28: ...ing 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 Tighten any connections Ensure that the 2505 s ground lug is connected to the vehicle chassis ground ...

Page 29: ... Coarse acquisition C A code 1 023 MHz chip rate code and carrier phase tracking Sensitivity 135 dBm antenna input level DGPS software Standard and enhanced with WAAS Performance characteristics Velocity 1852 km h 514 m sec max Acceleration 4 Gs 39 2 m sec2 Jerk 2 m sec3 Position accuracy 1 m circular error probability CEP DGPS 2 m circular error probability CEP WAAS ...

Page 30: ...24V systems 10 watts typical Serial communications Three RS 232 and two RS 422 asynchronous data ports configurable from 300 to 38 400 baud for GPS outputs 4800 and 9600 baud for SC 104 differential outputs Input messages NMEA 0182 protocol for GPS for details see Appendix B Data characteristics on page 21 RTCM SC 104 for beacon differential Output messages NMEA 0182 GGA and VTG at 5 Hz update rat...

Page 31: ...cted with each other and with external devices in a variety of ways for different applications Both RS 422 and RS 232 inputs and outputs are provided and have separate pins on the 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 Ta...

Page 32: ...S 232 receiver 1 input 7 RS 232 receiver 2 input 21 RS 232 receiver 3 input optional 10 RS 422 receiver 1 input A B 15 3 RS 422 receiver 2 input A B 1 14 RS 232 transmitter 1 output 6 RS 232 transmitter 2 output 20 RS 232 transmitter 3 output optional 9 RS 422 transmitter 1 output A B 5 18 RS 422 transmitter 2 output A B 16 4 ...

Page 33: ...EA message format This section describes the serial protocol used by the GPS receiver to communicate with a host device The serial communication runs under the following set up Data on the serial port is transmitted in one or more NMEA approved or proprietary sentences that have the following structure Speed 300 to 38 400 baud default is 4800 baud Format 8 bit data 1 start bit 1 stop bit no parity...

Page 34: ...ields are defined in Table 6 on page 25 HEADER CONTENTS OF DATA FIELDS PMCAG xxx xxx xx xx CK CR LF end of sentence checksum checksum field delimiter data 1st field message identifier interface ID G GPS originator ID MCA Canadian Marconi Company Special ID P Proprietary Record sync character ...

Page 35: ...able length field hours minutes seconds decimal 2 fixed digits of hours 2 fixed digits of minutes 2 fixed digits of seconds and a variable number of digits for decimal fraction of seconds Leading zeros always included for hours minutes and seconds to maintain fixed length The decimal point and associated decimal fraction are optional if full resolution is not required Defined field Some fields are...

Page 36: ...aracters Notes 1 Spaces can t be used in variable text field 2 A negative sign HEX 2D is the first character in a Field if the value is negative The sign is optional if value is positive Table 6 NMEA field definitions continued Field type Symbol Definition Table 7 Primary port input messages Message identifier Name Maximum sentence length characters 000 Configure Primary Port Command 17 001 Initia...

Page 37: ...s activated then NMEA communications with the GPS receiver can be restored only by using binary message 110 On power up with NVM the primary port stays in the same mode Without NVM the default mode is Monitor Mode CMC Binary Example Configure the Primary Port to Monitor Mode at 19200 PMCAG 000 0 58 CR LF HEADER CONTENTS OF DATA FIELDS PMCAG 000 x hh CR LF Character Baud rate 0 19200 1 300 2 600 3 ...

Page 38: ...tude 53 01 97 North Longitude 1 33 48 East Altitude 35 35 m above mean sea level Reserved No character HEADER CONTENTS OF DATA FIELDS reserved8 altitude7 longitude E W6 latitude N S5 reserved4 reserved3 time2 date1 1 UTC Date Day 1 31 Month 1 12 Year 1980 2079 2 UTC Time Hour 0 23 Minutes 0 59 Seconds 0 59 3 Reserved must be 0 4 Reserved must be 00 5 Latitude N S with respect to WGS 84 6 Longitude...

Page 39: ...tput message 902 on the primary output port at completion of the self test sequence Example PMCAG 003 47 CR LF Request output message command Example Request the approved sentence GPGGA PMCAG 004 GGA 2D CR LF HEADER CONTENTS OF DATA FIELDS PCMG 003 hh CR LF HEADER CONTENTS OF DATA FIELDS PMCAG 004 ccc hh CR LF sentence identifier1 1 Valid sentence identifiers are those listed in the next section e...

Page 40: ...e Date Examples PMCAG 005 4 8 GGA 010 RMC 001 VTG 001 ZDA 010 48 CR LF output messages 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 HEADER CONTENTS OF DATA FIELDS PMCAG 005 x x ccc xxx ccc xxxx hh ...

Page 41: ...ATION MANUAL Revision A Page 31 Switch to reprogramming mode command Example PMCAG 006 19 2 7A CR LF HEADER CONTENTS OF DATA FIELDS PMCAG 006 xx x hh CR LF baud rate1 1 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 ...

Page 42: ...ADER CONTENTS OF DATA FIELDS PMCAG 007 xxx hh CR LF Table 8 NVM elements Characters Element 00 All1 01 04 Reserved 05 Almanac 06 Ionospheric data 07 08 Reserved 09 TCXO parameters 10 UTC parameters 11 Position 12 Time 13 DGPS configuration 14 Default NMEA message list 15 RS 232 configuration1 1 This command will force the 2505 to go into BSC binary mode at 9600 baud at the next power up element1 1...

Page 43: ...8 0 A 100 A 004 6b CR LF Output messages MSS and 903 transmitted every 4 seconds Set the frequency to 288 0 in automatic mode and bit rate to 100 in automatic mode HEADER CONTENTS OF DATA FIELDS MSK x x a x x a x x hh CR LF interval for sending PCMCAG 903 and MSS message in seconds auto manual bit rate beacon bit rate 25 50 100 200 bits per second 1 Status request When status data I not to be tran...

Page 44: ...table 901 Data request list overflow 15 N A 902 Self test results 39 On request 903 Radiobeacon proprietary info 40 Adjustable via MSK GGA Global positioning system fix data 82 Adjustable GLL Graphic position latitude longitude 51 Adjustable GSA GPS DOP and active satellites 66 Adjustable GSV GPS satellites in view 3 70 Adjustable MSS MSS radiobeacon receiver signal status 29 Adjustable via MSK RM...

Page 45: ...ensor doesn t have a valid time and or a valid position from last good fix or external initialization 2 GPS fix quality indicator L Low Navigation solution is obtained from fewer than 5 satellite measurements H High Navigation solution is obtained from at least 5 satellite measurements 3DD 3 D fix with differential aiding 3 D 3 D fix 2 DD 2 D fix constant altitude with differential aiding 2 D 2 D ...

Page 46: ...otocol Page 36 2505 INSTALLATION MANUAL Revision A Data request list overflow This message is returned when more than eight data requests are pending Example PMCAG 901 4C CR LF HEADER CONTENTS OF DATA FIELDS PMCAG 901 hh CR LF ...

Page 47: ...input message identifier 004 to retrieve the current status of the sensor without initiating a self test sequence Examples PMCAG 902 613913 042 A PASS 00 63 23 CR LF PMCAG 902 613913 042 A FAIL 03 49 3B CR LF HEADER CONTENTS OF DATA FIELDS PMCAG 902 xxxxxx xxx a aaaa xx xx hh CR LF sensor self test result1 software revision letter 1 Sensor self test result from the last initiated test PASS FAIL so...

Page 48: ...er MSK Example GPCAG 903 6 2 24 0 0 0 0 62 CR LF HEADER CONTENTS OF DATA FIELDS PMCAG 903 x x aa x x x x x x x x x x hh CR LF reserved shall be null reserved shall be null 1 0s means all test passed bit 0 antenna fault default bit 1 battery backed RAM invalid bits 2 5 reserved software part number root number radiobeacon self test result1 reserved shall be null reserved shall be null impulse noise...

Page 49: ... of minutes 2 Longitude with respect to WGS 84 3 digits of degrees 2 digits of minutes 4 digits of decimal fraction of minutes 3 GPS quality indicator 0 fix not available or invalid 1 GPS fix 2 Differential GPS fix 4 May be different from number in view 5 Altitude with respect to mean sea level 6 Geoidal separation the difference between the WGS 84 earth ellipsoid and mean sea level geoid if negat...

Page 50: ... 172 35 8964 East UTC 01 23 38 61 Status Valid Data HEADER CONTENTS OF DATA FIELDS GPGLL 1111 1111 a yyyyy yyyy a hhmmss ss A hh CR LF E W East or West longitude2 1 Latitude with respect to WGS 84 2 digits of degrees 2 digits of minutes 4 digits of decimal fractions of minutes 2 Longitude with respect to WGS 84 3 digits of degrees 2 digits of minutes 4 digits of decimal fractions of minutes 3 Stat...

Page 51: ...LF Mode automatic 3 D SVs Used PRNs 14 22 03 09 08 29 17 PDOP 2 7 HDOP 2 2 VDOP 1 6 HEADER CONTENTS OF DATA FIELDS GPGSA a x xx xx xx xx xx xx xx xx xx xx xx xx xx x xx x xx x hh CR LF PDOP 1 PRN numbers of satellites used in solution null for unused fields 2 Mode 1 fix not available 2 2 D 3 3 D 3 Mode M manual forced to operate in 2 D or 3 D mode A automatic allowed to automatically switch 2 D 3 ...

Page 52: ...sg No 1 SV Visible 6 PRN 03 Elevation 12 Azimuth 238 SNR 6 dB PRN 07 Elevation 82 Azimuth 8 SNR 15 5 dB PRN 11 Elevation 4 Azimuth 53 SNR Not tracked PRN 27 Elevation 43 Azimuth 178 SNR 12 3 dB HEADER CONTENTS OF DATA FIELDS GPGSV x x xx xx xx xxx xx x xx xx xxx xx x hh CR LF 4th SV 1 SNR C No 00 0 99 9 dB null when not tracking 2 Azimuth range 000 to 359 degrees 3 Elevation range 00 to 90 degrees...

Page 53: ... protocol 2505 INSTALLATION MANUAL Revision A Page 43 GPGSV 2 2 06 15 23 187 8 2 17 35 323 11 1 4D CR LF Messages 2 Msg No 2 SV Visible 6 PRN 15 Elevation 23 Azimuth 187 SNR 8 2 dB PRN 17 Elevation 35 Azimuth 323 SNR 11 1 dB ...

Page 54: ...strength frequency and bit rate from an MSK beacon receiver This message will be transmitted at the rate set in the message GPCAG MSK Example GPMSS 32 13 288 0 100 68 CR LF HEADER CONTENTS OF DATA FIELDS GPMSS x x x x x x x x hh CR LF radiobeacon frequency 285 5 to 325 0 kHz signal to noise ration SNR dB signal strength SS dB re 1 uv m beacon bit rate 25 50 100 200 bits per second ...

Page 55: ...EADER CONTENTS OF DATA FIELDS GPRMC hhmmss ss A 1111 1111 a yyyyy yyyy a xxx x xxx x xxxxxx hh CR LF N S North or South latitude4 1 Date 2 digits for day 2 digits for month and 2 digits for year ddmmyy 2 The track made good measured in clockwise from North direction at the current position Range 0 360 degrees 3 Longitude 3 digits of degrees 2 digits of minutes 4 digits of decimal fraction of minut...

Page 56: ...l track made good and speed relative to the ground 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 HEADER CONTENTS OF DATA FIELDS GPVTG xxx x T xxx x N xxx x K hh CR LF speed degrees true track knots km hr speed ...

Page 57: ...45 Date 12 January 2003 Local zone 6 zones hours East of GMT HEADER CONTENTS OF DATA FIELDS GPZDA hhmmss ss xx xx xxxx xx xx K hh CR LF month day UTC time year local zone minutes description2 local zone description1 1 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 2 Local zone minutes 00 59 same sign as l...

Page 58: ...Appendix C NMEA output protocol Page 48 2505 INSTALLATION MANUAL Revision A ...

Page 59: ...as a U S Coast Guard beacon BDM Beacon DeModulator which is the receiver for differential correction signals C No Carrier to Noise Density Ratio CMC Canadian Marconi Company DRMS Distance Root Mean Square EEPROM Electrically Erasable Programmable Read Only Memory HDOP Horizontal Dilution of Precision Host Customer system receiving position data from the 2505 L1 The frequency band used by the GPS s...

Page 60: ...seudo Random Number satellite ID number RAM Random Access Memory RMS Root Mean Square RTCM Radio Technical Commission for Maritime Services for standards and performance minimums SC 104 The communication specification for differential corrections format TNC The type of connector used by the GPS antenna TTFF Time To First Fix VDOP Vertical Dilution of Precision WAAS Wide Area Augmentation System di...

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