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GM-82
GPS Engine Board
User’s Guide
Jan 02, 2002
HOLUX Technology Inc.
8F, 26, Tai-Yuen Street, Tai-Yuen Hi-Tech Industrial Park,
Chu Pei City 302, Hinchu, Taiwan.
Phone: +886-3-552-6268 Fax: +886-3-552-6108
E-Mail: info@holux.com.tw Web: www.holux.com.tw
All Right Reserved
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GM-82 User’s manual TABLE OF CONTENTS …………………………………………………………………………..…….. 3 1. Introduction 1.1 Overview ………………………………………………………………………………. 3 1.2 Features …………………………………………………………………………..….. 3 1.3 Technical Specifications ………………..……………………………..……………….. 3 ……………………………………….………………….. 4 2. Operational Characteristics 2.1 Initialization …………………………………………………………………………... 4 2.2 Navigation …………………………………………………………………………… 5 ……………………………………………….……………………….. 5 3. Hardware
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GM-82 User’s manual 1. Introduction 1.1 Overview The HOLUX GM-82 Engine Board is a total solution GPS receiver, designed based on SiRF star II Architecture. This positioning application meets strict needs such as car navigation, mapping, surveying, agriculture and so on. Only clear view of sky and certain power supply are necessary to the unit. GM-82 communicates with other electronic utilities via compatible dual-channel through RS-232 or TTL and saves critical satellite data
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GM-82 User’s manual 1.3.4 Performance 1) Tracks up to 12 satellites. 2) Update rate: 1 second. 3) Acquisition time: Reacquisition 0.1 sec, averaged Hot start 8 sec. averaged Warm start 38 sec. averaged Cold start 45 sec. averaged 4) Position accuracy: Non DGPS (Differential GPS) Position 5~25 meter CEP Velocity 0.1 meters/second. Time 1 microsecond synchronized GPS time DGPS (Differential GPS) Position 1 to 5 meters, typi
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GM-82 User’s manual 2.2 Navigation After the acquisition process is complete, the GM-82 sends valid navigation information over output channels. These data include: 1) Latitude/longitude/altitude 2) Velocity 3) Date/time 4) Error estimates 5) Satellite and receiver status 2.3 Manufacturing Default: Datum: WGS84. Baud Rate: 4800. Output: GGA, GSA, GSV, RMC or by demand. DGPS: RTCM SC-104(Type 1,2,9) or WAAS (in USA area) or EGNOS (in European area)
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GM-82 User’s manual J1 connector pin definition: Pin # Name Description 1 NC No function 2 VCC_5V Regulated 5.0V +/-5% input power, 160mA typical. 3 VBAT Battery backup input. 2.5V to 3.3V ,10uA typical. 4 NC No function Manual reset input, ground to reset receiver. Leave floating for 5 PBRESEN normal operation. The minimum plus width is 150 ms reset signal. 6 GPIO1 General purpose I/O pin 1 7 GPIO2 General purpose I/O pin 2 8 GPIO3 General purpose I/O pin 3 9 GPIO4 General purpos
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GM-82 User’s manual 4. Software Interface The GPS-82 interface protocol is based on the National Marine Electronics Association's NMEA 0183 ASCⅡinterface specification, which is defined in NMEA 0183, Version 2.2 and the Radio Technical Commission for Maritime Services (RTCM Recommended Standards For Differential Navstar GPS Service, Version 2.1, RTCM Special Committee No.104). 4.1 NMEA Transmitted Messages The default communication parameters for NMEA output are 4800 baud, 8 data
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GM-82 User’s manual 4.1.2 Geographic Position with Latitude/Longitude(GLL) Table 4-4 contains the values for the following example: $GPGLL,3723.2475,N,12158.3416,W,161229.487,A*2C Table 4-4 GLL Data Format Name Example Units Description Message ID $GPGLL GLL protocol header Latitude 3723.2475 ddmm.mmmm N/S Indicator N N/S Indicator N N=north or S=south Longitude 12158.3416 dddmm.mmmm E/W Indicator W E=east or W=west UTC Position 161229.487 hhmmss.sss Status A A=data
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GM-82 User’s manual Table 4-8 GSV Data Format Name Example Units Description Message ID $GPGSV GSV protocol header Number of Messages(1) 2 Range 1 to 3 Message Number(1) 1 Range 1 to 3 Satellites in View 07 Satellite ID 07 Channel 1 (Range 1 to 32) Elevation 79 degrees Channel 1 (Maximum 90) Azimuth 048 degrees Channel 1 (True, Range 0 to 359) SNR (C/No) 42 dBHz Range 0 to 99, null when not tracking .... .... Satellite ID 27 Channel 4 (Range 1 to 32) Elevation 27 degree
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GM-82 User’s manual 20 European 1950 - Iran International Data20.dat 21 European 1950 – Italy (Sardinia) International Data21.dat 22 European 1950 – Italy (Sicily) International Data22.dat 23 International Data23.dat European 1950 – Malta 24 European 1950 – Northern Regional Mean International Data24.dat 25 European 1950 – Portugal, Spain International Data25.dat 26 European 1950 – Southern Regional Mean International Data26.dat 27 European 1950 – Tunisia International Data27.dat 28
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GM-82 User’s manual 5.2 . Manufacturing Default: Parameter Com A Com B Input Protocol NMEA Binary RTCM SC-104 Output Protocol NMEA Binary None Baud Rate 4800 9600 Parity None None Stop Bits 1 1 Data Bits 8 8 Datum: WGS84. Protocol GGA, GSA, GSV, RMC o
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GM-82 User’s manual 6. Ordering Information 6.1 Products Options Output Back-up battery Input Power Connector Model No. Level Type Power Saving Type TTL or RS-232 Lithium No Volt. MCX SMA GM-82-A0X-5 RS-232 Y - 5 Y Y - GM-82-A0X-3 RS-232 Y - 3 Y Y - GM-82-A0A-5 RS-232 Y - 5 Y - Y GM-82-A0A-3 RS-232 Y - 3 Y - Y GM-82-A1X-5 RS-232 - Y 5 - Y - GM-82-A1X-3 RS-232 - Y 3 - Y - GM-82-A1A-5 RS-232 - Y 5 - - Y GM-82-A1A-3 RS-232 - Y 3 - - Y GM-82-T0X-5 TTL Y 5 Y Y - GM-82-T0X-3 T
