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GBX Reference Manual

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5. GBX NMEA 0183 Messages

This chapter identifies the selection of valid NMEA 0183 command and
status messages appropriate to the beacon receiver functions of the
GBX and the internal processor that operates the menu system.

5.1 GBX Supported Messages

Table 5-1 GBX Supported NMEA Messages

Message Description

Description

Commands

$GPMSK (Full Manual Tune)

Sets the receiver into Full Manual Tune Mode

$GPMSK (Partial Manual Tune)

Sets the receiver into Partial Manual Tune Mode

$GPMSK (ABS Mode)

Sets the receiver into Automatic Beacon Search Mode

$PCSI,4 (Proprietary)

Erases the Global Search table forcing a new search

$PCSI,5 (Proprietary)

Reserved (Factory use only)

$PCSI,6 (Proprietary)

Sets the internal and external GBX baud rates

$PCSI,7 (Proprietary)

Sets the Operating Mode of the GBX receiver

Queries

$GPCRQ Operation Query

Queries the receiver for operation parameters

$GPCRQ Performance Query

Queries the receiver for performance parameters

$PCSI,0 (Proprietary)

Lists available proprietary $PCSI commands and
queries

$PCSI,1 (Proprietary)

Reserved

$PCSI,2 (Proprietary)

Reserved

$PCSI,3 (Proprietary)

Reserved

5.2 GBX Beacon Response Message

The GBX will issue a NMEA formatted acknowledgment response
message upon receiving a selection of NMEA formatted command or
query messages. The intent of this message is to confirm that
communication exists between the GBX and the terminal device.

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Содержание GBX

Страница 1: ...GBX Reference Manual Part Number 875 0018 003 Date May 2001...

Страница 2: ...erence Manual ii CSI Wireless Inc 1200 58 Avenue SE Calgary Alberta Canada T2H 2C9 Telephone number 1 403 259 3311 Fax number 1 403 259 8866 E mail address info csi wireless com Web Site www csi wirel...

Страница 3: ...rom CSI Wireless Inc FCC Notice The GBX combination GPS Beacon receiver complies with the Part 15 Subpart J Emission Requirement for Class A digital devices for use in commercial business and industri...

Страница 4: ...or a particular purpose CSI Wireless hereby disclaims and excludes all other warranties In no event shall CSI Wireless be liable for direct indirect incidental collateral or consequential damages of a...

Страница 5: ...erson s or party s shall render this warranty null and void CSI Wireless does not warrant or guarantee the precision or accuracy of positions obtained when using CSI Wireless products Product accuracy...

Страница 6: ...GBX Reference Manual vi...

Страница 7: ...ions and Warnings xx 1 Introduction 1 1 1 GPS 1 1 1 1 How it Works 1 1 1 2 GPS Services 2 1 2 Differential GPS 2 1 2 1 How it Works 2 1 2 2 Real Time DGPS 3 1 3 DGPS Format 3 1 4 Radiobeacon DGPS Serv...

Страница 8: ...ternal Devices 16 2 4 GBX PRO Secondary Serial Port 18 2 5 Installing the MGL 3 Antenna 19 2 5 1 Antenna Placement To Optimize Reception 19 2 5 2 Antenna Installation 20 2 5 3 Routing and Securing the...

Страница 9: ...GBX Menu System 34 3 7 1 Start Up Sequence 34 3 7 2 Position Status Menu GBx Gx E and Bx E Mode 36 3 7 3 Satellites Menu GBx Gx E and Bx E Mode 38 3 7 4 Beacon Status Menu GBx Bx and Bx E Mode 39 3 7...

Страница 10: ...3 4 8 2 GLL Data Message All Except GBX 12R 54 4 8 3 GSA Data Message 54 4 8 4 GSV Data Message 55 4 8 5 RMC Data Message 56 4 8 6 SAT Data Message GBX 8A and GBX PRO only 56 4 8 7 VTG Data Message 57...

Страница 11: ...GBX Reference Manual xi Appendix A Specifications 72 Appendix B GBX Connectivity 76 Appendix C Beacon Information 82 Further Reading 84 Index 86...

Страница 12: ...GBX Reference Manual xii...

Страница 13: ...terface RS 232C Interface Level 18 Figure 3 1 GBX Display and Keypad 25 Figure 3 2 GBX GPS Position Fix Indicator 28 Figure 3 3 GBX Beacon Lock Indicator 29 Figure 3 4 Gx E RTCM Source Indicator 30 Fi...

Страница 14: ...GBX Reference Manual xiv...

Страница 15: ...age Elements 49 Table 4 2 GGA Data Message Defined 53 Table 4 3 GLL Data Message Defined 54 Table 4 4 GSA Data Message Defined 55 Table 4 5 GSV Data Message Defined 55 Table 4 6 RMC Data Message Defin...

Страница 16: ...GBX Reference Manual xvi Table A 3 External Signal Combiner Specifications 74...

Страница 17: ...ion in a wide array of applications and environments Compact lightweight yet rugged the GBX will provide you with years of reliable operation The GBX Series of receivers are very similar differing onl...

Страница 18: ...determining a source of difficulty for a particular installation Appendix A Specifications details the technical characteristics of the GBX receiver and MGL 3 antenna Appendix B GBX Operating Mode Int...

Страница 19: ...t model and serial number available when contacting CSI Wireless Customer Service In the event that your equipment requires service we recommend that you contact your dealer directly However if this i...

Страница 20: ...This icon indicates that you should press the Enter button of the receiver keypad This icon indicates that you should press the down arrow button of the receiver keypad Notes Cautions and Warnings No...

Страница 21: ...Works These satellites transmit coded information to GPS users at UHF 1 575 GHz frequencies that allows user equipment to calculate a range to each satellite GPS is essentially a timing system ranges...

Страница 22: ...ion applications an accuracy of 100 meters is insufficient and differential positioning techniques must be employed 1 2 Differential GPS The purpose of differential GPS DGPS is to remove the effects o...

Страница 23: ...PS Format For manufacturers of GPS equipment commonality is essential to maximize the utility and compatibility of a product The governing standard associated with GPS is the Interface Control Documen...

Страница 24: ...the transmitting antenna The expected range of a broadcast also depends upon the conductivity of the surface over which it travels A signal will propagate further over a surface with high conductivit...

Страница 25: ...s a minor part in signal transmission range as it absorbs and scatters the signal This type of loss is the least significant of those described 1 4 2 Radiobeacon Reception Various sources of noise aff...

Страница 26: ...ing the data from the broadcast does not lose lock when the beacon station has no new data to transmit The Type 7 message contains the radiobeacon almanac information composed of location frequency se...

Страница 27: ...Age of the received differential corrections Atmospheric conditions at the beacon and remote user locations Satellite geometry often expressed as a Dilution of Precision DOP Magnitude of multipath pre...

Страница 28: ...Any data loss that occurs through reception problems Most of these delays require less than a second though in some instances depending upon the amount of information being transferred overall delays...

Страница 29: ...oning accuracy These multipath signals increase the measured range to a satellite as the signal takes a longer route to the GPS antenna Certain precautions will minimize GPS antenna sensitivity to the...

Страница 30: ...edded within the GBX is CSI Wireless s 300 kHz SBX 2 dual channel minimum shift keying MSK demodulator It receives GPS correction information broadcast by 300 kHz DGPS radiobeacons The SBX 2 communica...

Страница 31: ...lowing only radiobeacon frequencies to be passed on to the beacon receiver inside the GBX The L1 GPS patch antenna features a low noise amplifier allowing the use of antenna cable lengths up to 10 met...

Страница 32: ...GBX Reference Manual 12...

Страница 33: ...n GBX Receiver n MGL 3 Antenna n Power Cable n Antenna Cable n Data Cable n Universal Mounting Bracket n Reference Manual 2 2 Receiver Layout and Connections The GBX receiver is easily installed requi...

Страница 34: ...iderations when installing the GBX 2 3 1 Receiver Placement The Universal Mounting Bracket U bracket supplied with the GBX is used to secure the receiver to the selected mounting surface You may insta...

Страница 35: ...bracket as a template when planning and drilling through holes 2 3 2 Environmental Considerations The GBX and antenna are designed to operate in an enclosed environment in which the temperature remai...

Страница 36: ...ground screw labeled GND on the back of the GBX to a counterpoise artificial ground This ground point may be a ground plate on a marine vessel the chassis of a vehicle or the negative terminal on a ba...

Страница 37: ...L 75 To establish communications between the GBX and your data logging or monitoring device you must Connect Pin 2 TXA of the GBX to the receive pin of the monitor Connect Pin 3 RXA of the GBX to Tx o...

Страница 38: ...nications the P1 Main baud rate of the GBX must be set to match that of the device to which it is connected Refer to Section 3 5 and Section 3 6 for instructions related to setting the GBX baud rate 2...

Страница 39: ...n 2 6 4 for pin out information on this cable 2 5 Installing the MGL 3 Antenna The following sections provide antenna installation details and information on various mounting options available Choose...

Страница 40: ...ter your receiver is receiving the signal The optimum antenna location will be a position where your average SNR is highest You should turn on all accessories that you intend to use during normal oper...

Страница 41: ...cals Do not run the extension cable through door or window jams Keep the antenna cable away from rotating machinery Do not bend or crimp the antenna extension cable Avoid placing tension on the cable...

Страница 42: ...le for installation of the MGL 3 antenna It consists of a hollow threaded post on a circular base Three screws are required to secure this mount to a mounting surface CSI Wireless PN 604 0002 000 2 6...

Страница 43: ...ess to this transmit line on pin 3 The following table provides pin out information for this cable A null modem and or gender changer may be required to successfully interface this cable to an externa...

Страница 44: ...GBX Reference Manual 24...

Страница 45: ...control panel is composed of an up arrow enter and down arrow key These keys allow you to navigate through the intuitive GBX menu system configuring operating parameters and viewing status information...

Страница 46: ...Lx or Lx mode of operation as there is not internal L band DGPS satellite receiver 3 2 1 GBx GPS Beacon Receiver Mode The GBx mode is the primary and default mode of GBX operation In this mode you hav...

Страница 47: ...onfiguration The receiver outputs RTCM data through the transmit data line of the serial port and receives beacon configuration commands and status queries through the data port receive pin You may se...

Страница 48: ...on Fix Status The GBX provides an indication of the GPS lock status as contained within the GPGGA message string output from the data port of the receiver This indicator is located in the lower right...

Страница 49: ...the upper right hand corner of the display The lock symbol illustrated in Figure 3 3 remains in the closed position when the GBX is locked to an RTCM signal and open when no broadcast is available fo...

Страница 50: ...you make to the GBX configuration are saved in memory for subsequent power up Table 3 1 Preset GBX Operating Settings Tune Mode Operating Mode Automatic GBx Table 3 2 Preset GBX Port Settings GBX Rec...

Страница 51: ...tune or select the desired beacon by name from the built in global listing Refer to Figure 3 5 and Section 3 6 to switch between Automatic and Manual Tune modes using the display and keypad 3 5 1 Aut...

Страница 52: ...this cycle until it finds a valid beacon 3 5 1 2 Background Search During the Background Search the second channel examines all frequencies at both the 100 and 200 bps MSK bit rates to identify beaco...

Страница 53: ...al above the noise floor The higher the SNR the better the beacon receiver is demodulating the signal You can easily monitor the SNR in the Beacon Status menu Table 3 3 describes the general quality o...

Страница 54: ...u apply power to the GBX it will sequence through four initialization screens These start up screens include a receiver initialization and memory check a display test a customized splash screen and a...

Страница 55: ...lected Bx ID 00000 H 0 Baud Rt 4800 XBX3 Mode L L Unit User Continent Country Beacon Name Select User Edit User Erase User User Entry User Entry LT LN Hgt Hdg Vel Age Back Back Back Back Back Back HDO...

Страница 56: ...9 10 B a c k Displays the current latitude in degrees minutes decimal minutes DM M This information is parsed from the GPGGA NMEA message Displays the current longitude in degrees minutes decimal min...

Страница 57: ...rsed from the GPGGA NMEA message Displays the current number of satellites being used by the GPS receiver in computing its position If this value is 4 or greater then the computed position is 3D and i...

Страница 58: ...he GPS satellite SV number tracked by channel XX of the external GPS receiver This information is parsed from the GPGSV NMEA message PASHR SAT for GBX PRO Displays the elevation angle 0 horizon to 90...

Страница 59: ...ed MSK bit rate in bits per second bps at which the GBX is demodulating RTCM data Signal Strength in dB V m SS 20 is 10 V m Ratio of SS over computed noise floor in dB Message throughput correct data...

Страница 60: ...the top menu level Returns the receiver to the last viewed menu 3 7 5 Setup Menu All Modes The Setup section of the menu tree provides access to GBX configuration information and sub menus 1 O p t i o...

Страница 61: ...r a geographical region Geographic regions are resolved into continent and country Additionally you may create a custom 10 element User Defined Table of beacons selected from the global listing This f...

Страница 62: ...ctor Pins 2 and 3 Change this parameter to match the baud rate of the external device with which the GBX is communicating GBx Gx E Bx or Bx E GBx Factory preset mode of operation In GBx mode the GBX r...

Страница 63: ...erved for CSI Wireless GBX products incorporating and additional L band DGPS satellite receiver Do not configure the GBX for this mode of operation DM M DMS or DD Pressing with this line in focus allo...

Страница 64: ...on update rate of 1 Hz or 5 Hz using the and keys When entering 5 Hz mode from 1 Hz the GPS NMEA message content is reduced to the GGA message only The change to 5 Hz is saved for subsequent power cyc...

Страница 65: ...press 3 8 2 Change Frequency and MSK Rate To modify the frequency and MSK rate to which the receiver is manually tuned Refer to Figure 3 5 Navigate to Tune in the Setup menu and press Scroll with the...

Страница 66: ...press 3 9 User Defined Beacon Table The GBX provides the facility to generate and store a User Table of up to ten frequently used stations You may use the receiver display and keypad to create this co...

Страница 67: ...s Scroll with the or keys until Select User is displayed then press Scroll with the or keys until the name of the beacon you wish to tune to is displayed and press 3 10 Firmware Updates Please contact...

Страница 68: ...ectronic devices including GPS and beacon receivers The National Marine Electronics Association publishes updates to the NMEA 0183 message standard The latest NMEA 0183 standard is available through N...

Страница 69: ...end a command it represents both a carriage return CR and line feed LF If a NMEA command is not working this terminal facility option may not be set correctly Please contact your dealer or CSI Wireles...

Страница 70: ...turned on or off and may be selected from GGA GLL GSA GSV RMC SAT VTG or ZDA The y field is the activation status where y ON or y OFF After message output configuration it is necessary to save all cha...

Страница 71: ...atically stores all changes made for subsequent power up The new message configuration will not be implemented until you cycle the power to the receiver 4 6 GBX 12R Message Activation The Rockwell Jup...

Страница 72: ...vation status where y ON or y OFF To change the update rate of the NMEA messages from the GBX PRO use the following command PASHS NME PER p CR LF The p field specifies the number of seconds between su...

Страница 73: ...a cc CR LF Table 4 2 GGA Data Message Defined Field Description hhmmss ss UTC time in hours minutes seconds of the GPS position ddmm mmmmm Latitude in degrees minutes and decimal minutes s s N or s S...

Страница 74: ...South latitude dddmm mmmmm Longitude in degrees minutes and decimal minutes s s E or s W for East or West longitude hhmmss ss UTC time in hours minutes and seconds of GPS position s Status s A valid s...

Страница 75: ...9 9 cc Checksum CR LF Carriage return and line feed 4 8 4 GSV Data Message The GSV message contains GPS satellite information Null fields occur where data is not available due to the number of satell...

Страница 76: ...n degrees minutes and decimal minutes n S N or s S for North or South latitude dddmm mmmmm Longitude in degrees minutes and decimal minutes w S E or s W for East or West longitude z z Ground speed in...

Страница 77: ...eaks down the VTG data message into its components This message has the following format GPVTG ttt c ttt c ggg gg u ggg gg u cc CR LF Table 4 8 VTG Data Message Defined Field Description ttt True cour...

Страница 78: ...into its components This message has the following format GPZDA hhmmss ss dd mm yyyy xx yy cc CR LF Table 4 9 ZDA Data Message Defined Field Description hhmmss ss UTC time in hours minutes seconds of...

Страница 79: ...GBX Reference Manual 59...

Страница 80: ...obal Search table forcing a newsearch PCSI 5 Proprietary Reserved Factory use only PCSI 6 Proprietary Sets the internal and external GBX baud rates PCSI 7 Proprietary Sets the Operating Mode of the GB...

Страница 81: ...d standard NMEA 0183 commands and their responses 5 3 1 1 Full Manual Tune Command GPMSK When in GBx Bx or Bx E mode this command instructs the GBX beacon receiver to tune to a specified frequency and...

Страница 82: ...his command instructs the GBX beacon receiver to tune to a specified frequency and automatically select the correct MSK rate It has the following form GPMSK fff f M A n CR LF Response PCSI ACK GPMSK f...

Страница 83: ...equency selection A Designates automatic MSK bit rate selection n Period of output of performance status message 0 to 100 seconds CRMSS The GBX provides the above response to this variety of GPMSK mes...

Страница 84: ...X to erase all parameters within the beacon almanac and to initiate a new Global Search to identify the beacon signals available for a particular area The command has the following form PCSI 4 CR LF R...

Страница 85: ...xternal and three internal GBX host communication ports P1 P2 P3 and P4 Baud rates r1 r2 r3 and r4 are selected from Table 5 2 Caution Only P1 is applicable to regular GBX operations Leave all others...

Страница 86: ...eacon receiver channel status messages are communicated between the SBX 2 engine and the GBX micro controller P4 DGPA 1200 2400 4800 or 9600 baud Sets the baud rate at which the RTCM corrections are o...

Страница 87: ...Beacon Queries This section discusses the standard and proprietary NMEA 0183 queries accepted by the GBX receiver 5 4 1 Standard Queries The following subsections describe the selection of valid stand...

Страница 88: ...tatus GPCRQ MSS CR LF Response CRMSS xx yy fff f ddd CS Field Description xx Signal Strength dB V m yy Signal to Noise Ratio dB fff f Frequency in kHz 283 5 to 325 ddd MSK bit rate 100 or 200 bps 5 4...

Страница 89: ...d PCSI 3 Reserved PCSI 4 Wipe Search PCSI 5 GPS SBX2 Port Rate P4 PCSI 6 XBX3 Port Rates P1 P2 P3 P4 PCSI 7 XBX3 Mode Note The PCSI 5 command is reserved for factory configuration of the GBX and its i...

Страница 90: ...cked to a valid beacon Beacon Lock symbol engaged Verify that GBX is locked to GPS satellites Lock symbol engaged Check integrity and connectivity of power and data cable connections Verify GBX Mode o...

Страница 91: ...GPS RTCM input baud rates Verify GPS receiver DGPS configuration GBX 8A GBX PRO only No GBX response to NMEA commands and queries Verify baud rate settings of GBX and terminal device GBX default baud...

Страница 92: ...l Specifications Item Specification Frequency 1 575 GHz Channels 8 or 12 Horizontal Accuracy 1 meter GBX PRO 5 meters Please contact CSI Wireless for detailed GPS receiver specifications Internal Beac...

Страница 93: ...9 40 VDC Power Consumption 4 8 W Power Connector Circular 2 pin Locking Plug Mechanical Characteristics Item Specification Enclosure Extruded Aluminum with Aluminum Front and Back Plates Length GBX P...

Страница 94: ...Mechanical Characteristics Item Specification Enclosure PVC Plastic Mounting Thread 1 14 UNS 2B Length 128 mm 5 06 Width 128 mm 5 06 Height 84 mm 3 33 Weight 450 g 1 0 lb Antenna Connector TNC S Ante...

Страница 95: ...m 3 6 Width 56 mm 2 2 Height 38 mm 1 5 Weight 204 g 0 45 lb Port J1 to Beacon Antenna BNC S Port J2 to GBX TNC S Port J3 to GPS Antenna TNC S Environmental Specifications Item Specification Storage Te...

Страница 96: ...GBX baud rate GBx Operating Mode The GBx operating mode is the two primary mode of operation for the GBX The data output from the GBX in this mode is differentially corrected GPS NMEA data To establi...

Страница 97: ...ions between the GBX an external RTCM source and your data monitoring device you must Connect Pin 2 TXA of the GBX to the receive pin of the monitor Connect Pin 3 RXA of the GBX to TX of the monitor d...

Страница 98: ...ovides differential corrections obtained by the internal beacon receiver of the GBX to a separate GPS receiver The output in this mode of operation is differential correction information in the RTCM d...

Страница 99: ...s correction data with the display of position information provided by an external GPS receiver To establish communications between the GBX and an external GPS receiver when in Bx E mode you must n Co...

Страница 100: ...GBX Reference Manual 80 2 TX 2 TX 3 RX 3 RX NMEA NMEA RTCM RTCM 5 GND 5 GND GND GND TX TX RX RX GBX Rear Panel External Device Figure B 4 Bx E Mode Interface...

Страница 101: ...GBX Reference Manual 81...

Страница 102: ...www csi wireless com This listing contains the following information regarding currently operating beacons and potential new sites Station name Frequency MSK rate Location Transmitting ID Reference st...

Страница 103: ...GBX Reference Manual 83...

Страница 104: ...io Technical Commission for Maritime Services RTCM Recommended Standards for Differential NAVSTAR GPS Service Version 2 2 Developed by Special Committee No 104 RTCM 1998 1800 Diagonal Rd Suite 600 Ale...

Страница 105: ...GBX Reference Manual 85...

Страница 106: ...urvey Adapter 20 Antennas MBL 3 Loop Antenna 18 MGL 3 Combination Antenna 18 Automatic Beacon Search ABS 37 41 60 Azimuth 35 B Background Search 30 Baud Rate 16 27 38 41 62 63 73 Beacon Command Center...

Страница 107: ...s 35 Options 38 Position Status 33 Satellite Status 34 Setup 37 Start Up 31 Message Throughput MTP 36 MGL 3 Combination Antenna 18 Multipath 8 N NMEA 0183 45 NMEA 0183 Beacon Command 58 Automatic Beac...

Страница 108: ...3 Gx E 24 39 74 P Power Cable Fuse 14 Preset Parameters 27 Q Q Factor 36 R Range 7 Range Rate 7 RTCM Message Types 5 RTCM SC 104 3 S Select Beacon 37 Selective Availability SA 2 7 Signal Strength 36 S...

Страница 109: ...GBX Reference Manual 89...

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