APPENDIX 2 DIGITAL INTERFACE
AP-5
ALR - Set Alarm State
POS - Device position and ship dimensions report or configuration command
VBW - Dual ground/water speed
VHW - Water speed and heading
$**ALR,hhmmss.ss,xxx,A,A,c—c*hh<CR><LF>
1 2 3 4 5
1. Time of alarm condition change, UTC (hhmmss.ss, hh: 00 to 23, mm: 00 to 59, ss.ss: 00.00 to
59.99, null)
2. Unique alarm number (identifier) at alarm source (000 to 999, null when no alarm)
3. Alarm condition (A=threshold exceeded, V=not exceeded)
4. Alarm acknowledge state (A=acknowledged, V=not acknowledged)
5. Alarm description text (alphanumeric)
$**POS,cc,xx,a, x.x,x.x,x.x,a,x.x,x.x,a*hh <CR><LF>
1 2 3 4 5 6 7 8 9 10
1. Equipment Identification (VD)
2. Equipment number (01 to 99)
3. Position validity flag (A=Valid)
4. Position X-coordinate (-999.9 to 999.9)
5. Position Y-coordinate (0.0 to 999.9)
6. Position Z-coordinate (null)
7. Ship’s width/length (V=Invalid)
8. Ship’s width (null)
9. Ship’s length (null)
10. Sentences status flag (R=Sentence is status report of current settings)
$**VBW,x.x,x.x,A,x.x,x.x,A,x.x,A,x.x,A*hh<CR><LF>
1 2 3 4 5 6 7 8 9 10
1. Longitudinal water speed, knots (-999.9 to 999.9 (or -999.99 to 999.99), null)
2. Transverse water speed, knots (null)
3. Status: water speed (A=Data valid V=Data invalid)
4. Longitudinal ground speed, knots (null)
5. Transverse ground speed, knots (null)
6. Status: ground speed (V=Data invalid)
7. Stern transverse water speed, knots (null)
8. Status: stern water speed (V=Data invalid)
9. Stern transverse ground speed, knots (null)
10. Status: stern ground speed (V=Data invalid)
$**VHW,x.x,T,x.x,M,x.x,N,x.x,K*hh <CR><LF>
1 2 3 4 5 6 7 8
1. Heading, degrees True (null)
2. T=True (fixed)
3. Heading, degrees Magnetic (null)
4. M=Magnetic (fixed)
5. Speed, knots (-999.9 to 999.9 (or -999.99 to 999.99), null)
6. N=Knots (fixed)
7. Speed, km/hr (-999.9 to 999.9 (or -999.99 to 999.99), null)
8. K=km/hr (fixed)
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