User Manual

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5
3 Software Interface
3.1 NMEA V3.01 Protocol
Its output signal level is TTL: 9600bps (default), 8 bit data, 1 stop bit and no parity.
It supports the following NMEA-0183
Messages: GGA, GLL, GSA, GSV, RMC and VTG.
NMEA Output Messages: the module board outputs the following messages as shown in
Table.
Table 1 NMEA-0183 Output Messages
NMEA Record
Description
GGA
Global positoning system fixed data
GLL
Geogrphic position – latitude / longitude
GSA
GNSS DOP and active satellites
GSV
GNSS satellites in view
RMC
Recommended minimum specific GNSS data
VTG
Course over ground and ground speed
3.1.1 GGA-Global Postioning System Fixed Data
Table 2 contains the values of the following example:
$GPGGA, 161229.487, 3723.24756, N, 12158.34162, 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
3723.24756
ddmm.mmmm
N/S Indicator
N
N=north or S=south
Longitude
12158.34162
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