I/O PORT DATA INPUT/OUTPUT
• The unit responds with OK followed by CR/LF.
Example: $OF
4.49.4 REQUEST AUTO DAYLIGHT SAVINGS TIME INTERVAL
This command returns a start and stop time for a specific interval.
• The user inputs R (HEX 52) followed by an interval number of 0-9 (HEX 30 - HEX 39).
• The unit responds with:
#c Yaa Dbbb Hmm Dbbb Hmm CR/LF
where:
c = interval number (0-9)
aa = year
bbb = Julian day
mm = hour
• The first group Dbbb Hmm indicates the start time of daylight savings.
• The second group Dbbb Hmm indicates the stop time of daylight savings.
Example: $OR3
4.49.5 SET AUTO DAYLIGHT SAVINGS TIME INTERVAL
This command allows the user to program a daylight savings time interval.
• The user inputs S (HEX 53) followed by:
caabbbmmbbbmm
where c, aa, bbb, and mm have the same weight/value as explained in the
REQUEST command.
Example: $OS4050920130102
General Specifications
If the stop time is greater than the start time, then the interval is assumed to be in the same year.
If the stop time is less than the start time, then the stop time is assumed to be in the next year.
Performing a “Cold Reset” will disable the Daylight Savings time feature and load in the ten
default time intervals.
Symmetricom Inc ET6xxx ExacTime GPS TC & FG (Rev C) 4-27
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