Argus Radar - SERIAL INTERFACE SPECIFICATIONS
988-10187-004 2.38
NOTE 12
This field is used for the Alert title which is mandatory and for an additional
alert description which is optional.
•
The first ALF sentence transmits the Alert title. An Alert title is maximum
16 characters short form of the alert text.
•
The optional second ALF sentence transmits the additional alert
description. Additional alert description is the long description of the alert.
The additional alert description contains more information for decision
making (i.e. alert description text).
•
The second ALF sentence uses null fields for Time of last change, Alert
category, Alert priority, and Alert state to allow longer text. The actual
number of valid characters should be such that the total number of
characters in a sentence does not exceed the “82”-character limit.
•
Some equipment standards specify alert text longer than 16 characters
(for example the AIS standard has defined some alerts to be coded with
ALR-sentence and with text longer than 16 characters). In such cases,
the first ALF sentence is used for the first 16 characters of the alert text as
alert title and the second ALFsentence to carry the full alert text.
EXAMPLES:
$IIALF,1,1,0,124304.50,A,W,A,,192,1,1,0,LOST TARGET*14<CR><LF>
$IIALF,2,1,1,081950.10,B,A,S,XYZ,0512,1,2,0,HEADING
LOST*2D<CR><LF>
$IIALF,2,2,1,,,,,XYZ,0512,1,2,0,NO SYSTEM HEADING
AVAILABLE*0D<CR><LF>
ARC – Alert command refused
This sentence is used for:
• Category A or C alerts (see IMO MSC.302(87)), for which it is illegal to accept
acknowledge or responsibility transfer, e.g. not enough information for decision support
available or the source of acknowledgement is not acceptable,
Note that in a properly working system such attempts should not happen.
• Category B (see IMO MSC.302(87)), if the source of acknowledge is not acceptable.
$--ARC, hhmmss.ss, aaa, x.x, x.x, c*hh <CR><LF>
Refused alert command, A, Q, O or S (see Note 5)
Alert instance, 1 to 999999 (see Note 4)
Alert identifier (see Note 3)
Manufacturer mnemonic code (see Note 2)
Time (see Note 1)
NOTE 1
Release time of the Alert Command Refused, e.g. for VDR purposes,
optional, can be a null field. The sender is allowed to use all alternatives
defined in IEC 61162-1:2010, Table 5, Field type summary. The receiver is
allowed to ignore the content of this field. If the receiver does not ignore this
field it should support all alternatives defined in IEC 61162-1:2010, Table 5,
Field type summary.
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