Symmetricom XLi IEEE 1588 User Manual

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Use function F66 to enable or disable Daylight Saving Time (DST), and to schedule when Local time 
enters and leaves DST. The factory setting for F66 is Manual (i.e., DST On). The hour for entering/
leaving DST is given in the 24-hour format. Entering/leaving DST can be scheduled for any hour of the 
day, any day of the year. However, transitions scheduled within 24 hours of the beginning/end of the year 
may not occur at the desired time. This function also works for locations in the southern hemisphere, 
where DST spans the new year.

Command Line

To display the current status of F66, enter a command using the following format:

XLi responds using the following format:

F66<S><STATE><ENTER/EXIT><CR>

where:

For example, to disable DST, enter:

XLi responds:

OK<CR><LF>

To enable DST and set the DST entry and exit times, use the following format:

F

=  ASCII character F

66

= function 

number

<S>

=  ASCII space character one or more.

<STATE>

= Off 

or 

Manual.

<ENTER/EXIT>

=  If <STATE> is Manual, <ENTER/EXIT> are the dates it enters and exits DST.

<CR>

=  carriage return character.

<LF>

=  line feed character.