Rikaline GPS-20
GPS Engine Board
SiRF Star II
V1.0 Aug 09, 2002
User’s Guide
Rikaline Marketing Corp.
5F-1, 125, RooseveltRd., Sec. 5, Taipei 116, Taiwan, R.O.C.
Phone: +886-2-2934-5456 Fax: +886-2-2934-4373
All Right Reserved
GPS-20 Operating Manual
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1. Introduction
1.1 Overview
The Rikaline GPS-20 GPS Engine Board is a total solution GPS receiver, designed based on SiRF Star
II Architecture and pin to pin compatible with SiRF Start I engine board for replacing the system existing in
the market using SiRF Start I. 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
GPS-20 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 GPS-20 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. Built-in WAAS and EGNOS demodulator.
1.3 Technical specifications
1.3.1 Physical Characteristics
Dimension: 71.1(L) x 40.6(W) x 14.4(H) mm
2.80"(L) x 1.60"(W) x 0.57"(H).
Weight: 25g
1.3.2 Environmental Characteristics
1) Operating temperature: -40oC to +85oC
2) Storage temperature: -55oC to +100oC.
-45oC to +80oC with battery
1.3.3 Electrical Characteristics
1.3.3.1 General:
1) Frequency: L1, 1,575.42MHz
2) C/A Code:
3) Channels:
1.023MHz Chip Rate
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1.3.3.2 Power
GPS-20 5V Version GPS-20 3.3V Version
TTL
TTL
Main Power
+5VDC±5%
3.3VDC±10%
170mA Typical
+2.5V to 3.3V
10µA Typical
230hr (9.6 days)
Supply Current
Backup Power
Backup Current
Packup Period
170mA Typical
+2.5V to 3.3V
10µA Typical
230hr (9.6 days)
1.3.3.3 Datum
WGS 84
1.3.4 Performance
1.3.4.1 Acquisition
1) Tracks up to 12 satellites.
2) Update rate: 1 second.
3) Acquisition time
Reacquisition 0.1 sec., averaged
Snap Start
Hot start
3
8
sec, averaged
sec., averaged
Warm start
Cold start
38 sec., averaged
45 sec., averaged
1.3.4.2 Position Aaccuracy: (Non Differential GPS)
Position
Velocity
Time
5-25 meter CEP without SA
0.1 meters/second, without SA
1
microsecond synchronized GPS time
1.3.4.3 DGPS Accuracy (Differential GPS)
Position
Velocity
1 to 5 meter, typical
0.05 meters/second, typical
1.3.4.4 Dynamic Conditions
Altitude
Velocity
Acceleration
Jerk
18,000 meters (60,000 feet) max
515 meters / second (1,000 knots) max
4 G, max
20
meters/second3 , max
1.3.4.5 1PPS Pulse
Level
TTL
Pulse Duration 100ms
Time Reference at the pulse positive edge
Measurements Aligned to GPS second, ± 1 microsecond
1.3.5 Interfaces
1.3.5.1 Interface
Two full duplex serial communication, RS-232 or TTL compatible level, with user selectable baud rate
(4800-Default, 9600, 19200, 38400).
1.3.5.2 Protocol Message
SiRF Binary – Position, Velocity, Altitude, Status and Control
NMEA 0183 Version 2.2 ASCII output -- GGA, GLL, GSA, GSV, RMC, ZDA and VTG.
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1.3.5.3 DGPS Protocol
Real-time Differential Correction input (RTCM SC-104 version 2.00 message types 1, 5 and 9).
2. Operational characteristics
2.1 Initialization
As soon as the initial self-test is complete, the GPS-20 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 GPS-20 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 GPS-20 Auto-locate feature is
capable of automatically determining a navigation solution without intervention from the host system.
However, acquisition performance can be improved when the host system initializes the GPS-20 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 GPS-20 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 GPS-20 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 GPS-20 to output a position
whenever a differential solution is available.
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3. Hardware interface
3.1 Connectors
3.1.1 Antenna Connector
MCX, RSMA
3.1.2 Interface Connector
20-Pin and 10-Pin straight header, 2mm pitch
3.2 Pin Assignment of Connector
Table 1-1 Pin list of the 20-Pin Digital Interface Connector (CN1)
Pin Number
Name
Description
1
2
ANT_PWR Antenna DC Voltage
VCC_5V
BAT
+5 DC Power Input
Backup Battery
3
4
VCC_3V
PBRES
GPIOA
GPIOB
GPIOC
GPIOD
GND
+3.3V DC Power Input
5
Push Button Reset Input. Active Low
SW dependent functions (note 1)
SW dependent functions (note 1)
SW dependent functions (note 1)
SW dependent functions (note 1)
Ground
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
TXA
Serial Data Output A
Serial Data Input A
RXA
GND
Ground
TXB
Serial Data Output B
Serial Data Input B
RXB
GND
Ground
BOOTSEL
GND
Booting Mode Select
Ground
TIMEMARK 1PPS Time Mark Output
ALT/GPIOE Alternative output (Reserved)
Table1-2Pinlistofthe10-PinDigitalInterfaceConnector(JP1)
Pin Number
Name
Description
1
2
GPIOF
JTDI
SW dependent functions (note 1)
JTAG software debug function
SW dependent functions (note 1)
JTAG software debug function
SW dependent functions (note 1)
JTAG software debug function
SW dependent functions (note 1)
JTAG software debug function
JTAG software debug function
Ground
3
GPIOG
JTMS
GPIOH
JTCK
GPIOI
JTDO
JTRST
GND
4
5
6
7
8
9
10
Note: 1) Pulled high (VCC/VDD) through on-board 100K Ohm resister.
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2) Pulled low (GND) through on-board 100K Ohm resister.
3.2.1 VCC_5V (+5V DC Power Input)
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This is the main DC power supply for a +5V-powered board. (Required for the GPS-20 5V version)
3.2.2 VCC_3V (+3.3V DC Power Input)
This is the main DC power supply for a +3.3V-powered board. (Required for 3.3V version)
3.2.3 ANT_PWR
DC voltage for an active antenna. This voltage is not required for operation with a passive antenna.
The antenna power may be supplied through the interface connector (CN1). The current limiting
(<200mA) should be supplied externally.
3.2.4 GND
GND provides the ground for the board. Connect all grounds.
3.2.5 Serial Data: RXA, RXB, TXA and TXB
The board supports two full duplex serial channels. All support variable baud rates, and all can be
controlled from the appropriate screens in GPS Monitor software. You can directly communicate with
a PC serial port.（TTL level should be turned to RS-232 level）
3.2.6 RXA
This is the main receiving channel and is used to receive software commands to the board from GPS
Monitor software or from user written software.
3.2.7 RXB
This is the auxiliary receiving channel and is used to input differential corrections to the board to
enable DGPS navigation.
3.2.8 TXA
This is the main transmitting channel and is used to output navigation and measurement data to GPS
Monitor or user written software.
3.2.9 TXB
For user’s application
3.2.10 PBRES
This pin provides an active-low reset input to the board. It causes the board to reset and start
searching for satellites. PB Reset is an optional input and, if not utilized, it may be left open.
3.2.11 Time mark
This pin provides 1 pulse per second output from the board, which is synchronized to within 1
microsecond of GPS time. The output is a TTL positive level signal.
3.2.12 Battery (BAT)
This is the battery backup supply that powers the SRAM and RTC when main power is off. Typical
current draw is 10 µA.
Without an external backup battery or supercap, the board will execute a cold start after every turn
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on. To achieve the faster start-up offered by a hot start or warm start, either a battery backup input
must be connected or a recharge battery installed
.
Table 1-3 Backup Battery Voltage Range
Board
MIN
MAX
GPS-20
2.5
3.3
With a 3.3V Lithium-Ion (2.3mAh) rechargeable .To maximize battery lifetime (3~5 years), the battery
voltage should not exceed 3.3V.
3.2.13 GPIO Functions
Several I/Os of CPU are connected to the digital interface connector for consumer applications and
are labeled GPIOA to GPIOI.
3.2.14 JTAG Functions
The JTAG interface provides a standard development/debugging interface. A simple header connects
to a variety of the off-the-shelf emulators to provide single-step, trap and access to all the internal
registers of the GSP2e.
3.3 TricklePowerTM Description
The GPS-20 design includes all the functionality necessary to implement the SiRF TricklePower
mode of operation. In this mode, the lowest average power dissipation is achieved by powering down
the board (after a position is determined) in such a manner that when it is turned back on it can
recomputed a position fix in the shortest amount of time. Standard TricklePower operates in three
states
3.3.1 Tracking State
In this state, the board is fully powered, tracking satellites, and gathering data.
3.3.2 CPU State
In this mode, the GRF2i has been turned off which removes the clock to the GSP2e. Without a clock,
the GSP2e is effectively powered down (although the RTC keeps running). The CPU would switch to
ECLK and kept running to process the GPS data until a position fix is determined and the result has
been transmitted by the serial communication interface.
3.3.3 Trickle State
In this state, the CPU is in a low power standby state and the receiver clocks are off with only the
RTC clock active. After a set amount of time, the RTC generates an NMI signal to wake up the
ARM-7 microprocessor and reset the receiver back to tracking state.
The default time for each TricklePower mode and the approximate current consumed (in each mode)
is shown in Table 1-4. For example, the TricklePower duty cycle (20%), the average receiver power
dissipation is approximately 165mW (60mA @ 3.3V) while maintaining one-second update rate.
Table 1-4 TricklePowerTM Power Consumption
+5V
Current
mA
+3.3V
Current
mA
Time
Msec
Mode
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Tracking
CPU
220
360
420
170
33
160
29
Trickle
0.55
0.55
Note: Table 1-4 does not include the external antenna power, which must be controlled from the system
power supply.
3.4 Push-to-Fix Description
The purpose of Push-to-Fix mode is to support applications where a position fix is only required when
requested by the user (or the application). To support this, the board is left in the Trikle state until
commanded to generate a fix.
3.4.1 Power-on State
In this state, the receiver calculates the position once, collects the ephemeris, and calibrates the RTC
before going back to the Trickle State.
3.4.2 Trickle State
In this state only the RTC is running. The supply current is typically <500uA, which includes the
standby current of the GSP2e and CPU.
There are three events that can happen which effectively return the CPU to normal operation:
3.4.3 Power-on
If power is removed, then re-applied to the board a reset signal is generated by the CPU supervisor.
After the reset has been removed, the CPU will start up, get a fix and return to Trickle State. This
typically takes 2 to 6 seconds.
3.4.4 Ephemeris Collection
Every 30 minutes the GSP2e WAKEUP signal is activated, wake up the CPU to calculate a fix, collect
a new ephemeris, calibrate the RTC and then go to the Trickle State.
3.4.5 User Requested Fix
With each user request of a fix, the CPU will wake up by toggling PBRES low (pin 5 of the digital
interface connector). The CPU is restarted and (following a Snap Start) a fix is calculated. Before
going back to Trickle State, the CPU will check the ephemeris and the RTC calibration.
Note – The CPU will restart ~ 200-600 mSec after the PBRES input is brought high.
3.5 SRAM DATA BACKUP Description
SiRFchiphasaninternal1M bSRAM forGPStaskandOSkernel;besides,wehaveaddedanexternal4M b(Canbe
expandedto8M b)foruserstoringcodes.
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4. Software Interface
4.1 NMEA Transmitted Messages
The GPS-20 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 4-1 NMEA-0183 Output Messages
NMEA Record
Description
Global positioning system fixed data
GPGGA
GPGLL
Geographic position- latitude/longitude
GNSS DOP and active satellites
GNSS satellites in view
Recommended minimum specific GNSS data
Course over ground and ground speed
GPGSA
GPGSV
GPRMC
GPVTG
4.1.1 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 4-2 GGA Data Format
Name
Message ID
Example
$GPGGA
Units
Description
GGA protocol header
UTC Time
161229.487
Hhmmss.sss
Latitude
3723.2475
ddmm.mmmm
N/S Indicator
Longitude
N
N=north or S=south
dddmm.mmmm
12158.3416
E/W Indicator
Position Fix Indicator
Satellites Used
HDOP
MSL Altitude
Units
Geoid Separation
Units
Age of Diff. Corr.
Diff. Ref. Station ID
Checksum
W
1
07
1.0
9.0
M
E=east or W=west
See Table 5-3
Range 0 to 12
Horizontal Dilution of Precision
Meters
Meters
Meters
Meters
second
M
Null fields when DGPS is not used
End of message termination
Description
0000
*18
<CR> <LF>
Table 4-3 Position Fix Indicator
Value
0
1
2
3
0 Fix not available or invalid
GPS SPS Mode, fix valid
Differential GPS, SPS Mode, fix valid
GPS PPS Mode, fix valid
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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
Message ID
Latitude
N/S Indicator
Longitude
E/W Indicator
UTC Position
Status
Example
$GPGLL
3723.2475
N
12158.3416
W
Units
Description
GLL protocol header
ddmm.mmmm
N=north or S=south
dddmm.mmmm
E=east or W=west
hhmmss.sss
161229.487
A
A=data valid or V=data not valid
Checksum
<CR> <LF>
*2C
End of message termination
4.1.3 GNSS DOP and Active Satellites (GSA)
Table 4-5 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 4-5 GSA Data Format
Name
Message ID
Mode 1
Example
$GPGSA
Units
Description
GSA protocol header
A
3
See Table 5-6
See Table 5-7
Mode 2
Satellite Used (1)
Satellite Used (1)
……
07
02
Sv on Channel 1
Sv on Channel 2
….
Satellite Used
PDOP
HDOP
VDOP
Checksum
<CR> <LF>
Sv on Channel 12
Position Dilution of Precision
Horizontal Dilution of Precision
Vertical Dilution of Precision
1.8
1.0
1.5
*33
End of message termination
(1) Satellite used in solution.
Table 4-6 Mode 1
Value
Description
M
A
Manual—forced to operate in 2D or 3D mode
2D Automatic—allowed to automatically switch 2D/3D
Table 4-7 Mode 2
Value
Description
1
2
3
Fix Not Available
2D
3D
4.1.4 GNSS Satellites in View (GSV)
Table 4-8 contains the values for the following example:
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$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 4-8 GSV Data Format
Name
Message ID
Example
$GPGSV
2
Units
Description
GSV protocol header
Range 1 to 3
Range 1 to 3
Range 1 to 12
Number of Messages
Message Number
Satellites in View
Satellite ID
Elevation
1
07
07
79
Channel 1 (Range 1 to 32)
degrees Channel 1 (Maximum 90)
Azimuth
SNR (C/No)
....
048
42
....
degrees Channel 1 (True, Range 0 to 359)
dBHz Range 0 to 99, null when not tracking
Satellite ID
Elevation
27
27
Channel 4 (Range 1 to 32)
degrees Channel 4 (Maximum 90)
Azimuth
138
42
*71
degrees Channel 4 (True, Range 0 to 359)
dBHz Range 0 to 99, null when not tracking
SNR (C/No)
Checksum
<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.
4.1.5 Recommended Minimum Specific GNSS Data (RMC)
Table 4-9 contains the values for the following example:
$GPRMC,161229.487,A,3723.2475,N,12158.3416,W,0.13,309.62,120598, ,*10
Table 4-9 RMC Data Format
Name
Message ID
UTC Time
Example
$GPRMC
161229.487
A
3723.2475
N
12158.3416
W
0.13
309.62
120598
Units
Description
RMC protocol header
hhmmss.sss
Status
Latitude
A=data valid or V=data not valid
ddmm.mmmm
N=north or S=south
dddmm.mmmm
N/S Indicator
Longitude
E/W Indicator
Speed Over Ground
Course Over Ground
Date
E=east or W=west
Knots
Degrees True
ddmmyy
Degrees E=east or W=west
Magnetic Variation (1)
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.
4.1.6 Course Over Ground and Ground Speed
Table 4-10 contains the values for the following example:
$GPVTG,309.62,T, ,M,0.13,N,0.2,K*6E
Table 4-10 VTG Data Format
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Name
Message ID
Course
Reference
Course
Example
$GPVTG
309.62
T
Units
Description
VTG protocol header
Degrees Measured heading
True
Degrees Measured heading
Magnetic (1)
Reference
Speed
M
0.13
N
Knots
Measured horizontal speed
Knots
Units
Speed
Units
0.2
K
Km/hr
Measured horizontal speed
Kilometers per hour
Checksum
<CR> <LF>
*6E
End of message termination
(1) SiRF Technology Inc. does not support magnetic declination. All “course over ground” data are
geodetic WGS84 directions.
4.2 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 GPS-20 by using Differential GPS
(DGPS) real-time pseudo-range correction data in RTCM SC-104 format, with message types 1, 5, or 9. As
using DGPS receiver with different communication parameters, GPS-20 may decode the data correctly to
generate accurate messages and save them in battery-back SRAM for later computing.
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5. Earth Datums
5.1 Earth Datums
The following is a list of the GPS-20 earth datum index and the corresponding earth datum name:
Item
1
2
Datum
Reference Ellipsoid
Clarke 1880
Krassovsky
Data name
Data1.dat
Data2.dat
Adindan - Ethiopia
Afgooye – Somalia
3
4
5
6
7
8
Alaska, Conus – North American 1983
Albania – S-42 (Pulkovo 1942)
Argentina
Australia
Bahrain – Ain el ABD 1970
Bangladesh
GRS 1980
Data3.dat
Data63.dat
Data4.dat
Data70.dat
Data5.dat
Data6.dat
Krassovsky 1940
South American 1969
Australian – National
International
Everest 1830
9
Bolivia
South American 1969
Clarke 1880
Data8.dat
Data7.dat
10 Botswana – ARC 1950
11 Brazil
12 Brunel, East Malaysia
13 Canada – North American 1983
14 Chile
15 Colombia
South American 1969
Everest (Sabah & Sarawak)
GRS 1980
South American 1969
South American 1969
International
Krassovsky 1940
South American 1969
International
International
International
International
International
International
International
International
International
International
International
International
Data9.dat
Data37.dat
Data10.dat
Data13.dat
Data12.dat
Data11.dat
Data64.dat
Data14.dat
Data29.dat
Data15.dat
Data16.dat
Data17.dat
Data18.dat
Data19.dat
Data20.dat
Data21.dat
Data22.dat
Data23.dat
Data24.dat
Data25.dat
Data26.dat
Data27.dat
Data28.dat
Data30.dat
Data32.dat
Data31.dat
Data33.dat
Data65.dat
Data34.dat
Data35.dat
Data65.dat
Data53.dat
Data67.dat
Data36.dat
Data38.dat
Data39.dat
Data40.dat
Data42.dat
Data41.dat
Data43.dat
16 Colombia – Provisional American 1956
17 Czechoslovakia – S-42 (Pulkovo 1942)
18 Ecuador
19 European 1950 – Central Regional Mean
20 European 1950 – Cyprus
21 European 1950 – Eastern Regional Mean
22 European 1950 – Egypt
23 European 1950 – Finland, Norway
24 European 1950 – Greece
25 European 1950 – Iran
26 European 1950 – Italy (Sardinia)
27 European 1950 – Italy (Sicily)
28 European 1950 – Malta
29 European 1950 – Northern Regional Mean
30 European 1950 – Portugal, Spain
31 European 1950 – Southern Regional Mean International
32 European 1950 – Tunisia
33 European 1950 – Western Regional mean
34 Guyana - South American 1969
35 Hawaii-North American 1983
36 Hong Kong
37 Hu_Tsu_Shan Taiwan
38 Hungary – S-42 (Pulkovo 1942)
39 Indian 1960
International
International
South American 1969
GRS1980
International
International
Krassovsky 1940
Everest 1830
Modified Airy
Krassovsky 1940
Clarke 1880
Krassovsky 1940
Clarke 1880
GRS1980
40 Ireland – 1965
41 Kazakhstan – S-42 (Pulkovo 1942)
42 Kenya, Tanzania- ARC 1960
43 Latvia – S-42 (Pulkovo 1942)
44 Liberia – 1964
45 Mexico, central America
46 OMAN
Clarke 1880
47 Pakistan
Everest 1830
South American 1969
South American 1969
Clarke 1866
48 Paraguay - South American 1969
49 Peru1 – South American 1969
50 Philippines
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Rikaline Marketing Corp.
5F-1, 125, Roosevelt Road, Sec. 5, Taipei, Taiwan 116
GPS-20 Operating Manual
Rik a lin e
51 Poland – S-42 (Pulkovo 1942)
52 Potsdam
53 Puerto Rico – Virgin Islands
54 Qatar national
55 Qornoq – Greenland (SOUTH)
56 Regional Mean
57 Reunion – Mascarene Islands
58 Romania – S-42 (Pulkovo 1942)
59 Rome 1940 – Italy
60 Saudi Arabia – Ain el Abd 1970
61 Singapore
62 South Africa
63 Thailand 1975
64 Tokyo_Japan
65 Tokyo_Korea
66 Tokyo_Mean
67 Tokyo_Okinawa
68 Trinidad, Tobago
69 Venezuela
70 Venezuela – Provisional American 1956
71 WGS84
Krassovsky 1940
Bessel 1841
Clarke 1866
International
International
South American 1969
International
Krassovsky 1940
International
International
Modified Fischer 1960
Clarke 1880
Everest 1830
Bessel 1841
Bessel 1841
Bessel 1841
Bessel 1841
South American 1969
South American 1969
International
Data68.dat
Data71.dat
Data44.dat
Data45.dat
Data46.dat
Data48.dat
Data47.dat
Data69.dat
Data49.dat
Data50.dat
Data51.dat
Data52.dat
Data54.dat
Data60.dat
Data61.dat
Data59.dat
Data62.dat
Data55.dat
Data57.dat
Data56.dat
Data58.dat
WGS84
5.2 Setting Syntax
5.2.1 Manufacturing Default:
Datum: WGS84.
Baud Rate: 4800.
Output: GGA, GSA, GSV, RMC.
5.2.2 Datum change syntax:
>DOS\Sirfprog /Fdataxx.dat –Px –Bx –Csh1
-Px: x is com port, 1= COM1, 2 = COM2
-Bx: x is baud rate, 4800, 9600, 19200 or 38400
Example:
Change Datum to WGS84,
Sirfprog /Fdata58.dat –P1 –B4800 –Csh1 <Entry>
After changing datum, the new datum will be kept in SRAM. If no power supplied to GPS-20 for more
than 9 days, user must re-set datum when power on.
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Rikaline Marketing Corp.
5F-1, 125, Roosevelt Road, Sec. 5, Taipei, Taiwan 116
GPS-20 Operating Manual
Rik a lin e
6. Ordering Information
6.1 Product Options
6.1.1 Input Power
GPS-20-5: 5V (Standard: TTL level, No backup battery)
GPS-20-3: 3.3V (Standard: TTL level, No backup battery)
6.2 Accessories
A-10302 Active Antenna, 2-Meter, MCX straight connector
A-10302-A Active Antenna, 2-Meter, MCX 90° connector
A-10305 Active Antenna, 5-Meter, MCX straight connector
A-10305-A Active Antenna, 5-Meter, MCX 90° connector
Active Antenna with other connector is produced on demand.
7. Warranty
The GPS-20 is warranted to be free from defects in material and functions for one year from the date
of purchase. Any failure of this product within this period under normal conditions will be replaced at
no charge to the customers.
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Rikaline Marketing Corp.
5F-1, 125, Roosevelt Road, Sec. 5, Taipei, Taiwan 116
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