25. ALERT MANAGEMENT SYSTEM (option)
25-5
No-alerts message
The no-alerts message to informs the AMS that the sensor has no active alerts. It is
sent at an interval not greater than 60 seconds, and may be used to clear the AMS
alert list. This message is sent as an ALR message, without a time stamp and includes
a “V” flag in the both the alert condition and acknowledgement field. The no-alerts
message is as shown below.
$--ALR,,,V,V,*hh
The alert-list message
The alerts-list message periodically refreshes the alert list in order for personnel to
have up-to-the-minute list of active alerts. The alert / alert list message is sent with an
interval not greater than 60 seconds. The alert / alert list message consists of the
same message(s) sent when the corresponding event occurred, but all active alerts
shall be reported. An example of two alert-list messages are shown below.
$--ALR,123456,123,A,A,Battery power in use*hh<CR><LF>
$--ALR,130507,456,A,V,Self test failure*hh<CR><LF>
ACK sentence
The AMS sends the ACK sentence to all sensors to acknowledge alerts. The sentence
format is as shown below, where xxx is the Alert no. generated by each sensor.
$--ACK,xxx*hh<CR><LF>
This AMS supports only the single alert acknowledgement as defined by IEC 80/520/
INF. In this case, it is necessary to send an alarm acknowledge message, the format
which is shown below, from the external from the AMS to the sensor. The message is
sent at an interval not greater than 60 seconds.
$--ACK,*hh<CR><LF>
25.6.2 ACN/ALC/ALF/ARC/HBT sentences
Sentences output from external equipment and AMS
The sentences output by external equipment and the AMS are as shown in the illus-
tration below.
Output sentence
External equipment AMS
• ALC (Alert cyclic list)
• ALF (Alert sentence)
• ARC (Alert command refused)
• HBT (Heartbeat supervision sentence)
• ACN (Alert command)
• HBT (Heartbeat supervision sentence)
AMS
ALC/ALF/ARC/HBT
External
Equipment
ACN/HBT
External
Equipment
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