APPENDIX 2 DIGITAL INTERFACE
AP-3
Sentence description
Input sentences
ACN - Alert command
GGA - Global Positioning System (GPS) fix data
RMC - Recommended minimum specific GNSS data
$**ACN,hhmmss.ss,aaa,x.x,x.x,c,a*hh<CR><LF>
1 2 3 4 5 6
1. Time (No use)
2. Manufacturer mnemonic code (3 characters, null)
3. Alert Identifier (000-9999999)
4. Alert Instance (0-999999, null)
5. Alert command (A,Q,O,S)
A=acknowledge
Q=request/repeat information
O=responsibility transfer
S=silence
6. Sentence status flag(C) (fixed)
$**GGA,hhmmss.ss,llll.ll,a,yyyyy.yy,a,x,xx,x.x,x.x,M,x.x,M,x.x,xxxx*hh<CR><LF>
1 2 3 4 5 6 7 8 9 10 11 12 13 14
1. UTC of position (No use)
2. Latitude (No use)
3. N/S (No use)
4. Longitude (No use)
5. E/W (No use)
6. GPS quality indicator (1 to 5)
7. Number of satllite in use (No use)
8. Horizontal dilution of precision (No use)
9. Antenna altitude (No use)
10. Unit (No use)
11. Geoidal separation (No use)
12. Unit (No use)
13. Age of differential GPS data (No use)
14. Differential reference station ID (No use)
$**RMC,hhmmss.ss,A,llll.ll,a,yyyyy.yy,a,x.x,x.x,ddmmyy,x.x,a,a,a*hh<CR><LF>
1 2 3 4 5 6 7 8 9 10
111213
1. UTC of position fix (No use)
2. Status (A=data valid)
3. Latitude (No use)
4. N/S (No use)
5. Longitude (No use)
6. E/W (No use)
7. Speed over ground, knots (0.00 - 999.99)
8. Course over ground, degrees true (0.00 - 359.99)
9. Date (No use)
10. Magnetic variation, degrees (No use)
11. E/W (No use)
12. Mode indicator (A= Autonomous mode D= Differential mode F=Float RTK P=Precise
R=Real time kinematic)
13. Navigational status indication (S=Safe)
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