Installation Manual

AIS Installation Manual Issue 1 33
7.4.5 ACS - AIS channel management information source
This sentence is used in conjunction with the ACA sentence. It identifies the originator of the
information contained in the ACA sentence and the date and time when the transponder
received that information.
$--ACS,x,xxxxxxxxx,hhmmss.ss,xx,xx,xxxx*hh<CR><LF>
day, month, year
UTC of receipt of information
MMSI of originator
sequence number
7.4.6 AIR – AIS interrogation request
The interrogation request sentence allows an external to request certain M.1371 messages
from other remote devices via the AIS system.
$--AIR,xxxxxxxxx,x.x,x,x.x,x,xxxxxxxxx,x.x,x*hh<CR><LF>
message sub-section
number of messages requested from station-2
MMSI of interrogated station-2
message sub-section
number of second message requested from station-1
message sub-section
M.1371 message requested from station-1
MMSI of interrogated station
When the transponder receives an AIR sentence it sends M.1371 interrogation messages (type
15) to the addressed station(s) and returns an ABK sentence to the requesting device indicating
that the transmission is complete.
7.4.7 ALR – Alarm condition and status
This sentence is sent by the transponder to all presentation ports order to report an alarm
condition on a device. It identifies the source of the alarm, whether it has been acknowledged or
not and the time at which the condition changed.
$--ALR,hhmmss.ss,xxx,A,A,c--c*hh<CR><LF>
descriptive text
acknowledge state
alarm condition
alarm source
time of condition change
This sentence is sent by the transponder whenever a new alarm is raised or its condition
changes state. It is also sent periodically even when there are no active alarms In order to
provide a positive indication of the current status of each alarm.
7.4.8 BBM - AIS broadcast binary message
The BBM sentence allows an external device to instruct the transponder to broadcast a block of
binary data in an M.1371 binary broadcast message (type 8) or a safety related broadcast
message (type 14).
!--BBM,x,x,x,x,x.x,s—s,x*hh<CR><LF>
number of fill-bits
encapsulated data
M.1371 message ID
AIS channel for broadcast of the radio message
sequential message identifier
sentence number
total number of sentences needed to transfer message
When the transponder receives one or more BBM sentences from an external device, is de-
encapsulates the encoded data and re-assembles an M.1371 message of type 8 or 14 and then