X
X
L
L
D
D
C
C
M
M
A
A
N
N
.
.
d
d
o
o
c
c
3
3
-
-
6
6
4
4
R
R
E
E
V
V
E
E
where:
<INHOUR>
= time to enter DST in 24-hour format
<SEP>
= one or more separator characters, either space comma or tab characters.
For output strings this will be a single space character
<INWEEK>
= which week to enter DST, 1, 2, 3, 4 or 0 (for last).
<INDAY>
= day of week to enter DST, 1 through 7 where Sunday is 1
<INMONTH>
= month to enter DST, 1 through 12 where 1 is January
<OUTHOUR>
= hour to exit DST, in 24 hour format
<OUTWEEK>
= which week to exit DST, 1, 2, 3, 4 or 0 (for last)
<OUTDAY>
= day in to exit DST, 1 through 7 where Sunday is 1
<OUTMONTH>
= month to exit DST, 1 through 12 where 1 is January
<LT>
= line terminator, a carriage return and line feed for output strings,
only a carriage return for input strings
If desired, any item may be replaced with a semicolon, which will leave its value unchanged. If any of
the items in an input string are invalid, an error message will be returned.
Sample Request:
F66<CR>
Response:
F66 MANUAL 02 1 1 04 02 0 1 10
Meaning:
Manual settings are in effect. The entry time is 02 a.m. on the first Sunday of
April and the exit time is 02 a.m. on the last Sunday in October.
Sample Entry:
F66 MANUAL ; 0 ; ; ; ; ; ;<CR>
Response:
OK<CR><LF>
Meaning:
DST will now be entered on the last week of the month. All other parameters
remain unchanged.
Sample Entry:
F66 MANUAL 4 2 2 3 13 4 6 11<CR>
Response:
OK<CR><LF>
Meaning:
DST will now be entered 04 a.m. on the 2nd Monday in March and exit DST at
01 p.m. on the 4th Friday in November.
3-267 reserved
3-268 SERIAL FUNCTION F68 - YEAR ENTRY (GPS EPOCH MANAGEMENT)
The GPS week number sent from the satellites has only 10 bits of precision, so that 1024 weeks from
January 6, 1980 (GPS week 0) it rolls back to 0. To correctly calculate calendar dates after this roll
point, firmware keeps track of the current year so that it can construct an absolute, non-rolling week
number since January 6, 1980.
The firmware has the current year embedded in code, and will properly handle dates through the year
2015. In addition, as the clock advances to each new year, the current year is updated and used in
future calendar calculations, thus calculations beyond 2015 are handled properly. No user intervention
is required as long as the current year saved in non-volatile memory is intact, and so long as the clock
runs locked to GPS at least once each 5 years to allow the year to be updated. If after 2015, the
current year saved in non-volatile memory is lost, or the clock is not locked to GPS within 5 years of
Summary of Contents for 151-600
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