User's Manual

20 of 25 Y1-03-0222 Rev T4T4
5.7.1. ACS Message Format
!-- ACS,x,xxxxxxxxx, hhmmss.ss,xx,xx,xxxx*hh<CR><LF>
field 1 2 3 4 5 6
Field Format Description
1 x Sequence Number , 0 to 9
2 xxxxxxxxx MMSI of originator
3 hhmmss.ss UTC of receipt of channel management information
4 xx UTC Day, 01 -31
5 xx UTC Month, 01 -12
6 xxxx UTC Year
5.8 AIS Alarm Messages (NMEA 0183 ALR, Text)
Local alarm condition and status. This sentence is used to report an alarm condition on a device and its current
state of acknowledgement.
5.8.1 ALR message format
!-- ALR,hhmmss.ss,xxx,A,A,c--c*hh<CR><LF>
field 1 2 3 4 5
Field Format Description
1 x hhmmss.ss = Time of alarm (UTC)
2 Unique alarm number
3 Alarm condition
4 Alarm acknowledge state
5 alarm description, text
Alarms descriptions presented are:
AIS: TX malfunction
AIS: Antenna VSWR exceeds limit
AIS: Rx channel 1 malfunction
AIS: Rx channel 2 malfunction
AIS: general failure
AIS: no sensor position in use
AIS: no valid SOG information
AIS: no valid COG information
AIS: 12V alarm
AIS: 5V alarm
AIS: Loss of serial interface integrity
AIS: Background noise above -77dBm
5.9 ACK messages
Can be generated by a minimum keypad and display (MKD) unit, chart plotter or other display device connected
to the NAUTICAST-B to acknowledge an alarm condition reported by the NAUTICAST-B.
5.9.1 ACK message format
!-- ACK,xxx*hh <CR><LF>
field 1
Field Format Description
1 x unique alarm number