Masterclock NTDS-A User Manual – Original – 2013-04-25
8
INITIAL OPERATION / SERVER ACQUISITION
After receiving power, the Masterclock Display will go
through an internal check. Time from the RTC backup will be
applied until the NTP time stamp is acquired.
STATUS LED (LIGHT EMITTING DIODE)
The LED colons between the digits on the display will follow
the protocol after power is applied (operation is
configurable via WinDiscovery or Telnet):
TIME ZONE OFFSETS
The Masterclock Display maintains time as UTC initially. A
Time Zone offset or bias can be provided to adjust the time
for display purposes. A bias can be set as a positive (+) or
negative (-) value. Expect a resolution of one second.
DAYLIGHT SAVING TIME
An automatic
Daylight Saving Time (DST)
adjustment can be
configured separately (see page 16) in addition to the Time
Zone offset mentioned above. DST begins on the second
Sunday of March at 2:00 AM (Local Time) and ends the first
Sunday of November at 2:00 AM (Local Time).
EU STANDARD – EUROPEAN UNION
In the European Union, daylight change times are defined
relative to the UTC time of day.
Summertime Period
begins
at 1:00 AM, UTC on the last Sunday of March and ends at
1:00 AM, UTC on the last Sunday of October.
FREEWHEELING ACCURACY
The NTDS-A has built-in provisions to allow it to freewheel
and maintain accuracy for extended periods in the absence
of NTP. These features also allow the unit to be set
manually and run without NTP with precision.
LED STATE
STATUS INDICATION
Flashing Colons
No Reference:
The device is not able to reference NTP
Solid Colons
Referenced Time:
The device is receiving time
referenced from a NTP server
Solid Colons
A controller (RC500 or other device) commanded
countdown is in progress
If NTP input
is different from UTC, do not
adjust the Time Zone and/or DST offset.
These will adjust automatically.
Daylight Savings Time (DST) adjustments
must be configured using the daylight time
option and not with the Time Zone offset
option in order to ensure proper year-
around operation.
