RoyalTek rgm-3600 用户手册
11
RGM-3600 Operational Manual
6. Software Specification and NMEA Protocol
Software Specification
GPS Firmware
[GSW3] GGA(1),GSA(1),GSV(5),RMC(1) 4800 GPS Firmware
GPS Utility
-
A GPS performance diagnostic utility is required
-
C/NO, TTFF
WAAS
-
Enable
NMEA V3.0 Protocol
Its output signal level is TTL: 4800 bps (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 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
GLL
Geographic 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
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