Furuno NX-700A Operator's Manual page 63

ALR: Set alarms
$NXALR,hhmmss.ss,xxx,A,A,c--c*hh<CR><LF>
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1. Time of alarm condition change, UTC
2. Local alarm number(identifier)
3. Alarm condition(A=threshold exceeded, V=not exceeded)
4. Alarm's acknowledge state, A=acknowledged V=unacknowledged
5. Alarm's description text
6. Checksum
Serial Interface
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4. INSTALLATION
4-19