5: Function Reference
F3 – Time & Date
When an optional oscillator is used because a GPS signal is unavailable, use function F3 to
manually set the XL-GPS system clock’s time and date. When the XL-GPS is using GPS as
timing reference, setting F3 manually is unnecessary. At startup, the XL-GPS synchronizes
its time and date to GPS.
F3 prompts the user for the Time Mode, the Date in mm/dd/yyyy format, and the Time in
hh:mm:ss format. The hours in hh:mm:ss should be given using 24-hour notation (e.g., 6
pm = 18:00).
TIME MODE selects which type of time (Local/Standard/GPS/UTC, see F69 - Time Mode)
is being entered by the user. The XL-GPS, translates the user entry into its equivalents in
other types of time. For example, entering LOCAL - 07/14/2002 - 15:47:10 in F3 shows up
on the front keypad display as UTC 198:10:47:10, PRESS TIME KEY 15:47 UTC is not
10:47 PST, which is only 5 hrs, not 8 with F1 set to –8:00. F3 defines only the entry of tim in
F3; it does not control the type of time displayed or output by the XL-GPS. F3’s Time Mode
should not be confused with F69 (see “F69 – Time Mode” on page90). F69 controls the type
of time displayed/output on the front panel display, “F8 – Continuous Time Once-per-
Second” on page60, and F90 – Code Output Configuration.
See "Factory Default Jumper and Switch Settings for Options" on page 166
Notes:
• Don’t manually set the time using F3 settings while the XL-GPS is locked to a
reference source and distributing time information. Doing so allows the XL-GPS to
distribute the potentially incorrect time set by F3 for up to 8 seconds until the XL-GPS
re-synchronizes to the reference source’s time. The XL-GPS will make this switch to
and from F3’s time without generating an alarm. In NTP, for example, this means that
incorrect time information could be distributed in NTP packets that are marked as
having the valid time.
Command Line
To display the time and date, send:
F3<CR>
XL-GPS responds:
F3<S><MM>/<DD>/<YYYY><SEP><hh>:<mm>:<ss><CR><LF>
where:
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