Sentence use reference
B-4 Appendix B: NMEA sentences 98-139768-A
B.2.3 ALR - Set alarm state
Local alarm condition and status. This sentence is used to report an alarm condition on a
device and its current state of acknowledgement.
$--ALR,hhmmss.ss,xxx,A, A,c--c*hh<CR><LF>
B.2.4 CRQ
$--CRQ,NRM*hh<CR><LF>
B.2.5 NRM - NAVTEX receiver mask (input/output)
$--NRM,x,x,hhhhhhhh,hhhhhhhh,a*hh<CR><LF>
Field Data format Description Comment
1 ALR Sentence Id Used
2 hhmmss.ss Time of alarm condition change, UTC Used
3 xxx Unique alarm number (identifier) at alarm source Used
4 A Alarm’s acknowledge state, A=Acknowledged,
V=Unacknowledged
Used
5 A Alarm condition, A=Threshold exceeded, V=Not
exceeded
Used
6 c--c*hh Alarm description text Used
Table B-4: NMEA sentence: ALR
Field Data format Description Comment
1 CRQ Query Used
2 NRM Filter settings Used
Table B-5: NMEA sentence: CRQ
Field Data format Description Comment
1 NRM Sentence Id Used
2 x Function code, 0 to 9 Used
3 x Frequency table index, 1 to 9 Used
4 hhhhhhhh Transmitter coverage area mask Used
5 hhhhhhhh Message type mask Used
6 a Sentence status flag, R or C Used (output) Optional (input)
Table B-6: NMEA sentence: NRM
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