21
Instruction Manual
CIRWATT B 400
2�27 - EVENTS
The dates of every setup change, battery replacement, time change, billing period closings, etc., are
recorded.
The meter is capable of storing up to 200 records
. The data organisation within the file is rotational.
This means that once the memory is full, the new data will overwrite the older data. This system en-
sures that the meter always has up-to-date information that corresponds to the latest data obtained.
2�28 - DAYLIGHT SAVING TIME
The meter – analyser automatically changes the official time. If the device is without power at the time
of the change, the change will take place when power is restored and the device is initialised.
The parameters that define this change have two different formats: one of them is generic, such that
the time is updated annually automatically; the other relies on the parameters included in the specific
message of the communications protocol. The formats are:
Generic format independent of the year, with month, day, time, delay or pre-set time change, as
per the applicable law (last Sunday of March, and last Sunday of October)
Format that specifies year, month, day, time, delay or time change.
The parameters for changing the official time, regardless of the format in which they are programmed,
are automatically updated at the beginning of the year, based on the generic format. If the message
specified in the communications protocol for updating the official time change is received, the format
will be modified as laid out in this message.
2�29 - SECURITY
2�29�1 - TAMPER DETECTOR
The device will generate an event and activate the alarm if the cover on the device is lifted. The alarm
can only be deactivated via the communications protocol. The minimum time between two tamper
events is 60 seconds.
When first initialised, the meter waits 72 hours before generating a tamper event to avoid false alarms
during the installation by the authorised installer.
2�29�2 -
PROTECTING THE INFORMATION STORED IN MEMORY
All means of accessing the meter's memory via communications are protected by read-write pass-
words.
These passwords have over 4 billion combinations, which makes the meter highly resistant against
attempts to alter the information stored on it (load curves, events, tariffs, setup).