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21January2021/Version 0
LEM International SA
Chemin des Aulx 8
1228 PLAN-LES-OUATES Switzerland
www.lem.com
If two different NTP servers are configured:
•
If only one server responds, its time is used
•
If both servers respond, the time of the server 2 is used
NTP servers response time is limited to 30 seconds.
!
Starting a transaction aborts any on-going time synchronization, as transactions prevail over
synchronization.
7.8.2. Local time
UTC is the reference time for the DCBM, timestamping logbook entries and getting updated from
time synchronizations.
Though, the DCBM supports local time as an applicative, legally non-relevant feature. It offers
more user-friendly information, for display and billing data notably.
L
egal non-relevance of local time is due to unlocked settings configuring local time. Actually a local
time timestamp can allow billing if it includes offset to UTC, such as in
/legal
timestamps.
Local time consists in an offset to UTC. Two features create this offset:
•
Time zone offset
•
DST offset
7.8.2.1. Time zone
Time zone configures the DCBM according to a geographical area. It consists in an offset of hours
and minutes, which is added to the UTC.
Time zone is configured using field
time/tz
(
/settings
API). It can be either a positive or
negative offset; hours can be set from -11 to +14 hours and minutes shall be picked between 00,
15, 30 and 45.
7.8.2.2. Daylight Saving Time
Daylight Saving Time is an offset of time to be added to time zone offset, usually half of the year.
It is configurable in field
time/dst
(
/settings
API). Boolean
activated
allows using it or not.
Field
offset
is the offset in minutes to use, during the part of year when DST is on. Fields
start
and
end
configure the boundaries within which DST offset shall be added to time zone offset. Out
of this range, the
offset
value is not used, allowing configuration of DST once and for all (DST
does not have to be manually activated and deactivated).
The
hour
subfields (in fields
start
and
end
) shall be expressed in local time.
i
!
Summary of Contents for DCBM 400 Series
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