Installation & Operation Manual TCC70XS
Page 59
4.1.2.3 Handling of a DST Switching
A Daylight-Saving Time (DST) switching of the output signals occurs automatically under the
following conditions:
1. The automatic mode has been selected:
“Local Time Zone = Auto + Reference Check“ at “Time Zone and DST–Mode“, please
refer to chapter “Reference:
Real
–
Time Clock Adjustment
“.
Likewise, start and end of DST must have been adjusted correctly, please refer to chapter
“Time Zone: Time Zone Adjustment“.
This DST switching only occurs at a full hour of local time. An announcement is set one
hour prior to switching; this status is contained in the
time code if “User Mode = Date +
Status” has been selected.
This DST switching affects signal outputs according to the example below.
2. The local time zone follows the time zone of the real
–
time reference. Adjustment:
“Local Time Zone = Same as Reference Input“ at “Time Zone and DST–Mode“, please
refer to chapter “Reference:
Real
–
Time Clock Adjustment
“.
The real
–
time reference must transmit a time zone with DST switching.
If the time of the real
–
time reference jumps, the time of the output signals will jump at the
very moment when the time code generator performs an update with time & date of the
real
–
time reference. This update occurs periodically according to configuration, normally
once a day at a user selectable hour (please refer to “Mode of Local Time Zone
Synchronisation“ at chapter “Reference:
Real
–
Time Clock Adjustment
“)
If the data of the real
–
time reference announces a DST switching,TCC70XS will be able to
execute the time jump simultaneously with the real
–
time reference if one of the following
conditions applies:
A:
Checkbox “After DST Switching of Reference Input“ is checked.
B:
The periodic update has been set to “Every second“.
Please refer to chapter “Reference:
Real
–
Time Clock Adjustment
“.
This DST switching affects signal outputs according to the example below.
If TCC70XS does the DST switching of the local time zone automatically, the sequence of the
generated real
–
time signals (time, date [day/month/year]) then will be for example:
Start of DST
End of DST
01:59:58, 28/03/04
01:59:59, 28/03/04
03:00:00, 28/03/04
03:00:01, 28/03/04
…
02:59:58, 31/10/04
02:59:59, 31/10/04
02:00:00, 31/10/04
02:00:01, 31/10/04
…
Note:
The moment of a time jump because of a DST switching can be shifted to a user
defined moment, if the operating mode is switched to FREE before the time jump
event (please notice section “The FREE Mode of the Time Code Generator”)
.