AQmax AQ-300-U User's Manual Manual - Page 12
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Appendix A
Software Interface
NMEA Transmitted
Messages
AQ Max
Technology Inc.
Fax: ++886 6 2380861
E-Mail:
The AQ-300 interface protocol is based on the National Marine Electronics
Association's NMEA 0183 ASCⅡinterface 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).
The AQ-300 supported by SiRF Technology Inc. also 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
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
1
2
3
6F-2, No.90, Sec.1, Chung-Hwa East Rd, Tainan, Taiwan
Web:
www.aqmax.com
Description
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
Units
$GPGGA
161229.487
3723.2475
N
12158.3416
W
1
07
1.0
9.0
Meters
M
Meters
Meters
M
Meters
second Null fields when DGPS is not used
0000
*18
0 Fix not available or invalid
GPS SPS Mode, fix valid
Differential GPS, SPS Mode, fix valid
GPS PPS Mode, fix valid
Description
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
End of message termination
Description
12