GPS-22 Operating Manual
Rikaline
Specifications subject to change without prior notice
Rikaline
International Corp.
14F
, 171, ChengGong Rd., Sanchong City, Taipei 241, Taiwan, R. O.C
Tel: ++886 2 8973-1899 Fax: ++886 2 8973-1896 E-Mail: [email protected] web: www.rikaline.com.tw
4. Software Interface
The GPS-22 interface protocol is based on the National Marine Electronics Association's NMEA 0183 ASC
Ⅱ
interface specification, which is defined in NMEA 0183, Version 2.1 and the Radio Technical Commission
for Maritime Services (RTCM Recommended Standards For Differential Navstar GPS Service, Version 2.1,
RTCM Special Committee No.104).
4.1 NMEA Transmitted Messages
The GPS-22 outputs data in NMEA-0183 format as defined by the National Marine Electronics Association
(NMEA), Standard.
The default communication parameters for NMEA output are 9600/4800 baud, 8 data bits, stop bit, and no
parity.
Table 4-1 NMEA-0183 Output Messages
NMEA Record Description
GPGGA
Global positioning system fixed data
GPGLL
Geographic position- latitude/longitude
GPGSA
GNSS DOP and active satellites
GPGSV
GNSS satellites in view
GPRMC
Recommended minimum specific GNSS data
GPVTG
Course over ground and ground speed
GPZDA
Date & Time
4.1.1 Global Positioning System Fix Data (GGA)
$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
Example Units
Description
Message ID
$GPGGA
GGA protocol header
UTC Time
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 5-3
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
Table 4-3 Position Fix Indicator
Value Description
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
