NSR Marine NVR-3000 Operation And Installation Manual Download

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NVR-3000 OPERATION MANUAL & INSTALLATION MANUAL

NVR-3000 OM.E 20210412-02

NOTE 5:

Alert priority: Emergency Alarm: E, for use with Bridge alert management

Alarm:                            A
Warning:                        W
Caution:                          C

NOTE 6:

The alert state transition is defined in Annex J

active – unacknowledged:

active – silenced:

active – acknowledged or active:  A
active – responsibility transferred: O
rectified – unacknowledged:

normal:

NOTE 7:

Used for proprietary alerts defined by the manufacturer. For standardized alerts this should be a null

field.

NOTE 8:

The alert identifier is unique within a single alert source. The alert identifier is a variable length integer

field of maximum 7-digit integer. It identifies the type of the alert e.g. a “lost target” alert. Standardized
alerts use unique alert identifiers described in equipment standards. Number range 10000-9999999 is
reserved for proprietary alerts. Alert Identifier examples: “001”, “2456789”, “245”.

NOTE 9:

The alert instance identifies the current instance of an alert to distinguish alerts of the same type (Alert

identifier) and from the same source (e.g. dangerous target). Alert instance is maximum 6-digit integer
from 1 to 999999. The number of alert instance can be freely defined by the manufacturer as long as it is
unique for one type of alert (alert identifier). It is not permitted to modify the alert instance within a life
cycle of a distributed alert (from ‘active & unacknowledged’ state until ‘normal’ state is reached). It can
be also a null field, when there is only one alert of that type.

NOTE 10:

The revision counter is the main method to follow up-to-date status. Revision counter is also unique for

each instance of alert. Revision counter starts with 1 and the step for increment is 1. The count resets to
1 after 99 is used. Revision counter increments on each change of content of any field of the alert.

NOTE 11:

The escalation counter is presenting the number of alert escalations after time expiration during the

state active-unacknowledged. The escalation counter starts with 0 and the step for increment is 1. The
count resets to 1 after 9 is used. The alert escalation can be the escalation from warning into warning
(activation of audible signal only), the escalation from warning to alarm or the escalation from alarm to
alarm with activation of back-up navigator alarm

NOTE 12:

This field is used for Alert title which is mandatory and for additional alert description which is

optional.

• The first ALF sentence transmits the Alert title. 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 ALF sentence to carry the full alert text.