Appendix 2-10
ALF - Alert sentence
$GPALF, x,x,x,hhmmss.ss,a,a,a,JRC,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 14
1: Total number of ALF sentence for this massage, 1-2
2: Sentence number, 1～2
3: Sequential message identifier, 0-9
4: Time of last change 2nd ALF: Null
5: Alert category, "B" 2nd ALF: Null
6: Alert priority 2nd ALF: Null
A: Alarm (Alarm)
W: Warning (Warning)
C: Caution (Caution)
7: Alert status 2nd ALF: Null
V: active - unacknowledged
S: active - silenced
A: active - acknowledged or active
O: active - responsibility transferred
U: rectified - unacknowledged
N: normal
8: Manufacture mnemonic code,: Null or "JRC"
9: Alert identifier
10: Alert instance, 1-999999
11: Revision counter, 1-99
12: Escalation counter, 0-9
13: Alert text
1st ALF: Alert title
2nd ALF: Alert description text
14: Checksum
HBT - Heartbeat supervision sentence
$GPHBT, x.x,A,x*hh<CR><LF>
1 2 3 4
1: Configured repeat interval
2: Equipment status
A: yes
V: no
3: Sequential sentence identifier, 0-9
4: Checksum
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