Symmetricom XL-GPS User Manual

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reference source and synchronizes with it, F8 displays the new time-of-year information. The transition 
looks like this:

365:16:00:14?

365:16:00:15?

365:16:00:16

365:16:00:17

199:13:56:03

199:13:56:04

In the first two lines above, the unsynchronized time is followed by a “?” time quality character. In this 
case, the “?” indicates that the XL-GPS is unlocked to a reference source. As the XL-GPS locks to the 
reference source, the “?” disappears, and after a couple seconds, the new synchronized time-of-year 
information appears. 

If the reference source becomes unavailable again, F8 continues generating time-of-year information 
based on the synchronized time, and the unlock “?” appears.

199:11:19:31

199:11:19:32

199:11:19:33?

199:11:19:34?

The format of time output can be changed using 

. The default 

output string format is:

<SOH>DDD:HH:MM:SSQ<CR><LF>

where:

<SOH>

=  ASCII Start-of-Heading character (e.g., in decimal ASCII code: 001)

<CR>

=  ASCII Carriage Return character; is output at the 1 PPS mark +/- 1 mS

<LF>

=  ASCII Line Feed character

DDD

= day-of-year

HH

= hours

MM

= minutes

SS

= seconds

:

= colon 

separator.

Q

=  time quality character (see the following table)