Symmetricom XLi IEEE 1588 User Manual

2

5

1

XLi responds:

OK<CR><LF>

To verify the change, enter:

XLi Responds:

F1 –8:00<CR><LF>

Use function F2 to make 12 or 24-hour time notation available from: 

•

•

•

And separately from:

•

F2 does not affect the output of the IEEE 1588 card.

The factory settings for F2 are 24-hour format for the display and 24-hour format for IRIG (F90)

The user can apply F2 regardless of the time scale selected using F69 (Local, Standard, TAI, GPS, 
UTC). 

Typically, 12 hour notation only applied to Standard and Local time. Symmetricom strongly recommends 
using 24 notation when F69 is set to TAI, GPS, and UTC. Applying 12 hour notation to those time scales 
is non-standard and causes ambiguous representation of time. For example, if 12 hour notation is 
applied to TAI, the front panel displays “249:10:21:34” once in the morning, and once at night.

Symmetricom strongly recommends using only 24 hour notation for the XLi IEEE 1588 Clock. 

The 12-hour notation counts hours from 1 to 12 twice per day, like a conventional wall clock. The 24-hour 
notation counts hours from 0 to 23 once per day. For example, in the 24 hour notation, 18:00 is 
equivalent to 06:00 in the 12-hour notation (i.e., 18:00 – 12 hours = 06:00).

Command Line

To display the current hour format, send: