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GPS Receiver
Oct. 01, 2004
HOLUX
Technology,.Inc
8F-11, 26, Tai Yuen St., Chu Pei, Hsin Chu, Taiwan
Phone: +886-3-5526268 Fax: +886-3-5526108
E-Mail: info@holux.com.tw Web: www.holux.com.tw
All Right Reserved
User’s Guide
GR-212
HOLU
X
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TABLE OF CONTENTS
1. Introduction
………………………………………………………………………………………..
3
1.1 Overview
……………………………………………………………………………………..
3
1.2 Features
……………………………………………………………………………………..
3
1.3 Technical Specifications
………………………………………………………………..
3
2. Operational Characteristics
……………………………………………………………….…
4
2.1 Initialization
………………………………………………………………………………….
4
2.2 Navigation
………………………………………………………………………………….
4
3. Hardware Interface
………………………………………………………………………….……
5
3.1 Dimension
………………………………………………………………………………….…
5
3.2 Interface
………………………………………………………………………………….……
5
3.3 Connector
………………………………………………………………………………….…
5
3.4 Accessories
………………………………………………………………………………….
6
3.5 Optional Cigarette Adapter
…………………………………………………………….
7
4. USB Driver
……………………………………………………………………………………….…
7
4.1 System Requirement
………………………………………………………………………
7
4.2 Installation
………………….…………………………………………………………….…
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4.2 Important
…………….……………………………………………………………………….
7
5. Software Interface
…………………………………………………………………………….…
8
5.1 NMEA Transmitted Sentences
……………………………………………………..…
8
5.2 RTCM Received Data
…………………………………………………………………..
11
6. Earth Datums
……………………………………………………………………………………….
11
6.1 Earth Datums
………………………………………………………………………………..
11
6.2 Setting Syntax
…………………………………………………………………………….…
13
7. Ordering Information
………………………………………………………………………..…
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7.1 Product Options
………………………………………………………………….…………
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7.2 Accessories type
…..……………………………………………………………….………
13
8. Warranty
………………………………………………………………………………………………
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1. Introduction
1.1 Overview
The HOLUX GR-212 Smart GPS Receiver 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,
security, agriculture and so on. Only clear view of sky and certain power supply are necessary to the unit. It
communicates with other electronic utilities via compatible dual-channel through RS-232 or TTL and saves
critical satellite data by built–in backup memory. With low power consumption, the GR-212 tracks up to 12
satellites at a time, re-acquires satellite signals in 100 ms and updates position data every second.
Trickle-Power allows the unit operates a fraction of the time and Push-to-Fix permits user to have a quick
position fix even though the receiver usually stays off.
1.2 Features
The GR-212 provides a host of features that make it easy for integration and use.
1. SiRF Star II chipset with embedded ARM7TDMI CPU available for customized applications in firmware。
2. High performance receiver tracks up to 12 satellites while providing first fast fix and low power
consumption.
3. Differential capability utilizes real-time RTCM corrections producing 1-5 meter position accuracy.
4. Compact design ideal for applications with minimal space.
5. A rechargeable battery sustains internal clock and memory. The battery is recharged during normal
operation.
6. User initialization is not required.
7. Dual communication channels and user selectable baud rates allow maximum interface capability and
flexibility.
8. Optional communication levels, RS-232 and TTL meet ordinary application and new fashions of connecting
PDA with TTL or RS-232 output.
9. FLASH based program memory: New software revisions upgradeable through serial interface.
10. LED display status: The LED provides users visible positioning status. LED “ON” when power connected
and “BLINKING” when GR-212 got positioned.
11. Built-in WAAS Demodulator.
12. Water proof design for industry standard.
1.3 Technology specifications
1.3.1 Physical Dimension
Single construction integrated antenna/receiver.
Size: 64.5 x 42 x 17.8 (mm)
2.54 x 1.65 x 0.7 (Inch).
1.3.2 Environmental Characteristics
1) Operating temperature: -40oC to +85oC(internal temperature).
2) Storage temperature: -45
o
C to +100oC.
1.3.3 Electrical Characteristics
1) Input voltage: +4.75 ~ 5.5 VDC without accessories.
2) Backup power: 3V Rechargeable Lithium cell battery, up to 500 hours discharge.
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
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Cold start 45 sec., averaged
4) Position accuracy:
A) Non DGPS (Differential GPS)
Position 5-25 meter CEP without SA
Velocity 0.1 meters/second, without SA
Time 1 microsecond synchronized GPS time
B) DGPS (Differential GPS)
Position 1 to 5 meter, typical
Velocity 0.05 meters/second, typical
C)EGNOS/WAAS/Beacon
Position < 2.2 meters, horizontal 95% of time
< 5 meters, vertical 95% of time
5) Dynamic Conditions:
Altitude 18,000 meters (60,000 feet) max
Velocity 515 meters / second (1000 knots) max
Acceleration 4 G, max
Jerk 20 meters/second, max
1.3.5 Interfaces
1) Dual channel RS-232 or TTL compatible level, with user selectable baud rate (4800-Default, 9600, 19200,
38400).
2) NMEA 0183 Version 2.2 ASCII output (GGA, GSA, GSV, RMC, option GLL, VTG, ZDA).
3) Real-time Differential Correction input (RTCM SC-104 message types 1,2 and 9).
4) SiRF binary protocol.
2. Operational characteristics
2.1 Initialization
As soon as the initial self-test is complete, the GR-212 begins the process of satellite acquisition and
tracking automatically. Under normal circumstances, it takes approximately 45 seconds to achieve a position fix,
38 seconds if ephemeris data is known. After a position fix has been calculated, information about valid position,
velocity and time is transmitted over the output channel.
The GR-212 utilizes initial data, such as last stored position, date, time and satellite orbital data, to achieve
maximum acquisition performance. If significant inaccuracy exists in the initial data, or the orbital data is
obsolete, it may take more time to achieve a navigation solution. The GR-212 Auto-locate feature is capable of
automatically determining a navigation solution without intervention from the host system. However, acquisition
performance can be improved as the host system initializes the GR-212 in the following situation:
1) Moving further than 500 kilometers.
2) Failure of data storage due to the inactive internal memory battery.
2.2 Navigation
After the acquisition process is complete, the GR-212 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
The GR-212 sets the default of auto-searching for real-time differential corrections in RTCM SC-104
standard format, with the message types 1, 5, or 9. It accomplishes the satellite data to generate a differential
(DGPS) solution. The host system, at its option, may also command the GR-212 to output a position whenever
a differential solution is available.
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3. Hardware interface
3.1 Dimension
3.2 Hardware Interface
The GR-212 includes an antenna in a unique style waterproof gadget. Simply connect PS-2 female
connector to one of the accessories linking to your notebook PC, PDA or other devices. The one-piece
cigarette adapter allows you to connect GR-212 to your PDAs. Optional color, input voltage and output
connector are listed and described below:
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3.3 Connector
The GR-212 is equipped with optional connectors.
Cable Length: 2 meter
3.3.1 Function definition of PS-2 female composite connectors
3.4 Accessories
3.4.1 CA-RS232: DB 9 pins Female and PS-2 male connector:
Cable Length: To GR-212: 1 meter
RS-232 to PS-2: 45 cm
3.4.1.1 DB 9 pins Female connector function definition:
Pin Si
g
nal Name
1 N.C
2Tx
3Rx
4N.C
5
接地
6N.C
7N.C
8N.C
9 DGPS in
N.C = No connection
3.4.1.2 PS2 composite connector function definition:
Pin Si
g
nal Name
1+5V
2N.C
3N.C
4 Ground
5N.C
6 N.C
N.C = No connection
Signal
Pin
RS-232 RS232+TTL
1 Tx TX(RS232)
2 +5VDC +5VDC
3 NC Tx(TTL)
4 Ground Ground
5 DGPS IN Rx(TTL)
6 Rx RX(RS232)
N. C. = No Connection
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3.4.2 Cigarette adapter and PDA connector:
reference section 7.2
3.4.3 CA-USB: USB connector
The USB A Type is equipped with GR-212. The function definition is as follows:
Pin Si
g
nal Name
1+5V
2D +
3D 4 Ground
3.4.4 CA-6V30V: High power connector
3.5 Optional Cigarette Adapter
The optional cigarette adapter is with 2-meter cable for using in a car or boat.
Input voltage: DC12V - 26V
4. USB Driver
4.1 System Requirements
IBM, Pentium or above and other compatible PC; 16 MB and above memory; Windows 98/Me/2000; VGA
Graphic Adapter.
4.2 Installation
1. Copy entire <GR-212 USB> folder from CD to hard disk.
2. Connect GR-212 USB connector to computer. While the computer automatically starts the installation
program, please direct the driver to the <GR-212 USB> folder.
Color Signal
Black Ground
Red +6~30VDC
Green Tx
White Rx
Orange DGPS IN
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3. After the installation is complete, go to <Device Manager> and select <Ports (COM & LPT)> to verify if a
virtual COM port <USB to Serial Port> was created.
4.3 Important
Verify the COM port # to start using your own navigating software.
1. Click <Start> menu, select <Settings>, then enter <Control Panel>.
2. After entering <Control Panel>, select <System>.
3. Select <Device Manager>.
4. Find the <Connect port> and check the Virtual COM Port, which was created by the USB driver,
Please note that the Virtual COM Port number might be different from every computer. Before using
navigating software, please confirm the COM Port numbers created by your computer and provided by
your navigation software. Otherwise, the navigating software won’t receive the satellite signal, because of
the un-match COM Port setting.
5. Software Interface
The GR-212 interface protocol is based on the National Marine Electronics Association's NMEA 0183 ASC
Ⅱinterface 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, Type 1,2,9) or WAAS (in USA area) or EGNOS (in European area)
).
5.1 NMEA Transmitted Messages
The GR-212 supported by SiRF Technology Inc. also outputs data in NMEA-0183 format as defined by the
National Marine Electronics Association (NMEA), Standard.
The default communication parameters for NMEA output are 4800 baud, 8 data bits, stop bit, and no parity.
Table 5-1 NMEA-0183 Output Messages
NMEA Record Description
GPGGA Global positioning system fixed data
GPGLL Geographic position- latitude/longitude
GPGSA GNSS DOP and active satellites
GPGSV GNSS satellites in view
GPRMC Recommended minimum specific GNSS data
GPVTG Course over ground and ground speed
5.1.1 Global Positioning System Fix Data (GGA)
Table 5-2 contains the values for the following example:
$GPGGA,161229.487,3723.2475,N,12158.3416,W,1,07,1.0,9.0,M, , , ,0000*18
Table 5-2 GGA Data Format
Name Example Units Description
Message ID $GPGGA GGA protocol header
UTC Time 161229.487 hhmmss.sss
Latitude 3723.2475 ddmm.mmmm
N/S Indicator N N=north or S=south
Longitude 12158.3416 dddmm.mmmm
E/W Indicator W E=east or W=west
Position Fix Indicator 1 See Table 5-3
Satellites Used 07 Range 0 to 12
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HDOP 1.0 Horizontal Dilution of Precision
MSL Altitude 9.0 Meters
Units M Meters
Geoid Separation Meters
Units M Meters
Age of Diff. Corr. second Null fields when DGPS is not used
Diff. Ref. Station ID 0000
Checksum *18
<CR> <LF> End of message termination
Table 5-3 Position Fix Indicator
Value Description
0 0 Fix not available or invalid
1 GPS SPS Mode, fix valid
2 Differential GPS, SPS Mode, fix valid
3 GPS PPS Mode, fix valid
5.1.2 Geographic Position with Latitude/Longitude(GLL)
Table 5-4 contains the values for the following example:
$GPGLL,3723.2475,N,12158.3416,W,161229.487,A*2C
Table 5-4 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 valid or V=data not valid
Checksum *2C
<CR> <LF> End of message termination
5.1.3 GNSS DOP and Active Satellites (GSA)
Table 5-5 contains the values for the following example:
$GPGSA,A,3,07,02,26,27,09,04,15, , , , , ,1.8,1.0,1.5*33
Table 5-5 GSA Data Format
Name Example Units Description
Message ID $GPGSA
GSA protocol header
Mode 1 A See Table 5-6
Mode 2 3
See Table 5-7
Satellite Used(1) 07 Sv on Channel 1
Satellite Used(1) 02 Sv on Channel 2
…… ….
Satellite Used Sv on Channel 12
PDOP 1.8 Position Dilution of Precision
HDOP 1.0 Horizontal Dilution of Precision
VDOP 1.5 Vertical Dilution of Precision
Checksum *33
<CR> <LF> End of message termination
1. Satellite used in solution.
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Table 5-6 Mode 1
Value Description
M Manual—forced to operate in 2D or 3D mode
A 2DAutomatic—allowed to automatically switch 2D/3D
Table 5-7 Mode 2
Value Description
1 Fix Not Available
2 2D
3 3D
5.1.4 GNSS Satellites in View (GSV)
Table 5-8 contains the values for the following example:
$GPGSV,2,1,07,07,79,048,42,02,51,062,43,26,36,256,42,27,27,138,42*71
$GPGSV,2,2,07,09,23,313,42,04,19,159,41,15,12,041,42*41
Table 5-8 GSV Data Format
Name Example Units Description
Message ID $GPGSV GSV protocol header
Number of Messages 2 Range 1 to 3
Message Number 1 Range 1 to 3
Satellites in View 07 Range 1 to 12
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 degrees Channel 4 (Maximum 90)
Azimuth 138 degrees Channel 4 (True, Range 0 to 359)
SNR (C/No) 42 dBHz Range 0 to 99, null when not tracking
Checksum *71
<CR> <LF> End of message termination
NOTE: Items <4>,<5>,<6> and <7> repeat for each satellite in view to a maximum of four (4) satellites per
sentence. Additional satellites in view information must be sent in subsequent sentences. These fields will be
null if unused.
5.1.5 Recommended Minimum Specific GNSS Data (RMC)
Table 5-9 contains the values for the following example:
$GPRMC,161229.487,A,3723.2475,N,12158.3416,W,0.13,309.62,120598, ,*10
Table 5-9 RMC Data Format
Name Example Units Description
Message ID $GPRMC
RMC protocol header
UTC Time 161229.487 hhmmss.sss
Status A A=data valid or V=data not valid
Latitude 3723.2475 ddmm.mmmm
N/S Indicator N N=north or S=south
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Longitude 12158.3416 dddmm.mmmm
E/W Indicator W E=east or W=west
Speed Over Ground 0.13 knots
Course Over Ground 309.62 degrees True
Date 120598 ddmmyy
Magnetic Variation(1) degrees E=east or W=west
Checksum *10
<CR> <LF> End of message termination
1. SiRF Technology Inc. does not support magnetic declination. All “course over ground” data are geodetic
WGS84 directions.
5.1.6 Course Over Ground and Ground Speed (VTG)
Table 5-10 contains the values for the following example:
$GPVTG,309.62,T, ,M,0.13,N,0.2,K*6E
Table 5-10 VTG Data Format
Name Example Units Description
Message ID $GPVTG VTG protocol header
Course 309.62 degrees Measured heading
Reference T True
Course degrees Measured heading
Reference M Magnetic(1)
Speed 0.13 knots Measured horizontal speed
Units N Knots
Speed 0.2 km/hr Measured horizontal speed
Units K Kilometers per hour
Checksum *6E
<CR> <LF> End of message termination
1. SiRF Technology Inc. does not support magnetic declination. All “course over ground” data are geodetic
WGS84 directions.
5.2 RTCM Received Data
The default communication parameters for DGPS Input are 9600 baud, 8 data bits, stop bit, and no parity.
Position accuracy of less than 5 meters can be achieved with the GR-212 by using Differential GPS (DGPS)
real-time pseudo-range correction data in RTCM SC-104 format, with message types 1,2, or 9. As using
DGPS receiver with different communication parameters, GR-212 may decode the data correctly to generate
accurate messages and save them in battery-back SRAM for later computing.
6. Earth Datums
6.1 Earth Datums
The following is a list of the GR-212 earth datum index and the corresponding earth datum name:
Item Datum Reference Ellipsoid Data name
1 Adindan - Ethiopia Clarke 1880 Data1.dat
2 Afgooye – Somalia Krassovsky Data2.dat
3 Alaska, Conus – North American 1983 GRS 1980 Data3.dat
4 Albania – S-42 (Pulkovo 1942) Krassovsky 1940 Data63.dat
5 Argentina South American 1969 Data4.dat
6 Australia Australian – National Data70.dat
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7 Bahrain – Ain el ABD 1970 International Data5.dat
8 Bangladesh Everest 1830 Data6.dat
9 Bolivia South American 1969 Data8.dat
10 Botswana – ARC 1950 Clarke 1880 Data7.dat
11 Brazil South American 1969 Data9.dat
12 Brunel, East Malaysia Everest (Sabah & Sarawak) Data37.dat
13 Canada – North American 1983 GRS 1980 Data10.dat
14 Chile South American 1969 Data13.dat
15 Colombia South American 1969 Data12.dat
16 Colombia – Provisional American 1956 International Data11.dat
17 Czechoslovakia – S-42 (Pulkovo 1942) Krassovsky 1940 Data64.dat
18 Ecuador South American 1969 Data14.dat
19 European 1950 – Central Regional Mean International Data29.dat
20 European 1950 – Cyprus International Data15.dat
21 European 1950 – Eastern Regional Mean International Data16.dat
22 European 1950 – Egypt International Data17.dat
23 European 1950 – Finland, Norway International Data18.dat
24 European 1950 – Greece International Data19.dat
25 European 1950 – Iran International Data20.dat
26 European 1950 – Italy (Sardinia) International Data21.dat
27 European 1950 – Italy (Sicily) International Data22.dat
28 European 1950 – Malta International Data23.dat
29 European 1950 – Northern Regional Mean International Data24.dat
30 European 1950 – Portugal, Spain International Data25.dat
31 European 1950 – Southern Regional Mean International Data26.dat
32 European 1950 – Tunisia International Data27.dat
33 European 1950 – Western Regional mean International Data28.dat
34 Guyana - South American 1969 South American 1969 Data30.dat
35 Hawaii-North American 1983 GRS1980 Data32.dat
36 Hong Kong International Data31.dat
37 Hu_Tsu_Shan Taiwan International Data33.dat
38 Hungary – S-42 (Pulkovo 1942) Krassovsky 1940 Data65.dat
39 Indian 1960 Everest 1830 Data34.dat
40 Ireland - 1965 Modified Airy Data35.dat
41 Kazakhstan – S-42 (Pulkovo 1942) Krassovsky 1940 Data65.dat
42 Kenya, Tanzania- ARC 1960 Clarke 1880 Data53.dat
43 Latvia – S-42 (Pulkovo 1942) Krassovsky 1940 Data67.dat
44 Liberia – 1964 Clarke 1880 Data36.dat
45 Mexico, central America GRS1980 Data38.dat
46 OMAN Clarke 1880 Data39.dat
47 Pakistan Everest 1830 Data40.dat
48 Paraguay - South American 1969 South American 1969 Data42.dat
49 Peru1 – South American 1969 South American 1969 Data41.dat
50 Philippines Clarke 1866 Data43.dat
51 Poland – S-42 (Pulkovo 1942) Krassovsky 1940 Data68.dat
52 Potsdam Bessel 1841 Data71.dat
53 Puerto Rico – Virgin Islands Clarke 1866 Data44.dat
54 Qatar national International Data45.dat
55 Qornoq – Greenland (SOUTH) International Data46.dat
56 Regional Mean South American 1969 Data48.dat
57 Reunion – Mascarene Islands International Data47.dat
58 Romania – S-42 (Pulkovo 1942) Krassovsky 1940 Data69.dat
59 Rome 1940 – Italy International Data49.dat
60 Saudi Arabia – Ain el Abd 1970 International Data50.dat
61 Singapore Modified Fischer 1960 Data51.dat
62 South Africa Clarke 1880 Data52.dat
63 Thailand 1975 Everest 1830 Data54.dat
64 Tokyo_Japan Bessel 1841 Data60.dat
65 Tokyo_Korea Bessel 1841 Data61.dat
66 Tokyo_Mean Bessel 1841 Data59.dat
67 Tokyo_Okinawa Bessel 1841 Data62.dat
68 Trinidad, Tobago South American 1969 Data55.dat
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