APPENDIX 2 DIGITAL INTERFACE
AP-4
VTG - Course over ground and ground speed
ZDA - Time and date
Output sentences
ALC - Cyclic alert list
ALF - Alert sentence
$**VTG,x.x,T,x.x,M,x.x,N,x.x,K,a*hh <CR><LF>
1 2 3 4 5 6 7 8 9
1. Course over ground, degrees True (0.00 to 359.99)
2. T=True (fixed)
3. Course over ground, degrees Magnetic (No use)
4. M=Magnetic (fixed)
5. Speed over ground, knots (0.00 to 999.99)
6. N=Knots (fixed)
7. Speed over ground (0.00 to 999.99)
8. K=km/h (fixed)
9. Mode indicator (
A=Autonomous, D=Differential P=Precise)
$- - ZDA,hhmmss.ss,xx,xx,xxxx,xx,xx*hh<CR><LF>
1 2 3 4 5 6
1. UTC (000000 to 235959.99)
2. Day (01 to 31, UTC)
3. Month (01 to 12, UTC)
4. Year (0000 to 9999, UTC)
5. Local zone, hours (No use)
6. Local zone, minutes (No use)
$**ALC,xx,xx,xx,xx, aaa,x.x,x.x,x.x,’’’’’’*hh<CR><LF>
1 2 3 4 5 6 7 8 9
1. Total number of sentences this message (01 to 99)
2. Sentence number (01 to 99)
3. Sequential message identifier (00 to 99)
4. Number of alert entries (0 to 3)
5. Manufacturer mnemonic code (FEC)
6. Alert identifier (211000 to 211999)
7. Alert instance (1 to 2, null)
8. Revision counter (1 to 99)
9. Additional alert entries (same as #5 to #8)
$**ALF,x,x,x,hhmmss.ss,a,a,a,aaa,x.x,x.x,x.x,x,c--c*hh<CR><LF>
1 2 3 4 5 6 7 8 9 10
11 12 13
1. Total number of ALF sentences this message (1, 2)
2. Sentence number (1, 2)
3. Sequential message identifier (0 to 9)
4. Time of last change (hhmmss.ss, hh: 00 to 23, mm: 00 to 59, ss.ss: 00.00 to 59.99, null)
5. Alert category (B=Alert category B, null when #2 is 2)
6. Alert priority (C=Caution, null when #2 is 2)
7. Alert state (A=ACked, N=Normal state, null when #2 is 2)
8. Manufacturer mnemonic code (FEC)
9. Alert identifier (211000 to 211999)
10. Alert instance (1 to 2, null)
11. Revision counter (1 to 99)
12. Escalation counter (0 to 9)
13. Alert text (max. 16 characters)
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