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Spectracom Format 0

Format 0 is the universal NENA format, along with formats 1, 2, and 3. Format 0 includes a time synchronization status character, day of year, time reflecting Time Zone Offset and DST corrections when enabled. Format 0 also includes the DST/Standard Time indicator, and the Time Zone Offset value. Format 0 data structure is shown below:

Example message:



CR Carriage Return
LF Line Feed
I Time Sync Status (space, ?, *)
^ Space separator
DDD Day of Year (001-366)
HH Hours (00-23)
: Colon separator
MM Minutes (00-59)
SS Seconds (00- 60)
D Daylight Saving Time indicator (S,I,D,O)
TZ Time Zone
XX Time Zone offset (00-23)

The leading edge of the first character (CR) marks the on-time point of the data stream.

The time synchronization status character (I) is defined as described below:

? When the receiver is unable to track any satellites and the time synchronization lamp is red.
* When the receiver time is derived from the battery backed clock or set manually through the Setup Port Interface.

The Daylight Saving Time indicator (D) is defined as:

S During periods of Standard time for the selected DST schedule.
I During the 24-hour period preceding the change into DST.
D During periods of Daylight Saving Time for the selected DST schedule.
O During the 24-hour period preceding the change out of DST.


271 12:45:36 DTZ=08

The example data stream provides the following information:

Sync Status Time synchronized to GNSS
Date Day 271
Time 12:45:36 Pacific Daylight Time
D DST, Time Zone 08 = Pacific Time