Where, Soh>ddd:hh:mm:ssq<cr><lf – Symmetricom XL-GPS User Manual
Page 53
997-01530-01, Rev. C-25, Jan 2008
43
2
5
1
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
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
“F11 – Time Output Format” on page 46
. 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)