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RoyalTek Confidential 16
REB-1315LPNX Operational Manual
2. Software Interface
NMEA Protocol
NMEA Output Messages: the Engine board outputs the following messages as shown in Table 1:
Table 1 NMEA-0183 Output Messages
NMEA Record Description
GGA Global positioning system fixed data
GSA GNSS DOP and active satellites
GSV GNSS satellites in view
RMC Recommended minimum specific GNSS data
GLL Geographic position – latitude/longitude
VTG Course over ground and ground speed
GGA-Global Positioning System Fixed Data
Table 2 contains the values of the following example:
$GPGGA, 161229.487, 3723.2475, N, 12158.3416, W, 1, 07, 1.0, 9.0, M, , , ,0000*18
Table 2 GGA Data Format
Name Example
Units Description
Message ID $GPGGA
GGA protocol header
UTC Position 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 2-1
Satellites Used 07 Range 0 to 12
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