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XLi Time & Frequency System
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XLi-man, Issue 8, 6/17/2008, Rev. H
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Notes:
•
Most IRIG time code doesn’t contain “year” information. For this reason, use F3 to set the year
before setting IRIG up as a primary reference source.
•
The year in F3 rolls over automatically at the end of the year
if the unit is operating during the
transition
. If it is not operating during the transition, the user must manually set the year the next
time the unit is operating. This is important for scenarios where time code that does not provide
year information is being used as a reference source. Should the clock switch, for example, from
GPS to the time code reference, and the year is set incorrectly in F3, any time outputs or displays
that use year information will be correspondingly affected.
•
Avoid saving new F3 settings while the XLi is locked to a reference source and distributing time
information. Doing so allows the XLi to distribute the potentially incorrect time set by F3 for up to
8 seconds until the XLi re-synchronizes to the reference source’s time. The XLi 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>
XLi responds:
F3<S><MM>/<DD>/<YYYY><SEP><hh>:<mm>:<ss><CR><LF>
where:
F3
= ASCII string for function F3.
<S>
= ASCII space character (one or more).
<TIME MODE>
= the time mode the entered time refers to; LOCAL/STANDARD/GPS/UTC
<SEP>
= one or more separator characters: either space, comma or tab
<MM>
= two-digit
month
<DD>
= two-digit day of month
<YYYY>
= four-digit
year
/
= ASCII character for slash delimiter
:
= ASCII character for a colon delimiter.
<hh>
= one- or two-digit hours.
<mm>
= two-digit
minutes.
<ss>
= two-digit
seconds.
<CR>
= carriage return character.
<LF>
= line feed character.
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