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Appendix A
The GPS-6012 interface protocol is based on the National Marine Electronics Association's NMEA 0183
ASC Ⅱ interface 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).
A.1 NMEA Transmitted Messages
The GPS-6012 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 A-1 NMEA-0183 Output Messages
NMEA Sentence
GPGGA
GPGLL
GPGSA
GPGSV
GPRMC
GPVTG
A.1.1 Global Positioning System Fix Data (GGA)
Table A-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 A-2 GGA Data Format
Name
Message ID
UTC Time
Latitude
N/S Indicator
Longitude
E/W Indicator
Position Fix Indicator
Satellites Used
HDOP
MSL Altitude
Units
Geoid Separation
Units
Age of Diff. Corr.
Diff. Ref. Station ID
Checksum
<CR> <LF>
Table A-3 Position Fix Indicator
Value
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
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International Corp.
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GPS-6012 Operating Manual
Software Interface
Global positioning system fixed data
Geographic position latitude \ longitude
GNSS DOP and active satellites
GNSS satellites in view.
Recommended minimum specific GNSS data
Course over ground and ground speed
Example
$GPGGA
161229.487
3723.2475
N
12158.3416
W
1
07
1.0
9.0
M
M
Second
0000
*18
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Fax: ++886 2 2370 4686
Description
Units
GGA protocol header
Hhmmss.sss
ddmm.mmmm
N=north or S=south
dddmm.mmmm
E=east or W=west
See Table 5-3
Range 0 to 12
Horizontal Dilution of Precision
Meters
Meters
Meters
Meters
Null fields when DGPS is not used
End of message termination
Description
E-Mail:
info@rikaline.com.tw
Description
Web: www.rikaline.com.tw
Rikaline
11
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