Symmetricom XL-GPS User Manual

Page of 162
997-01530-01, Rev. C-25, Jan 2008
61
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
F69 – Time Mode
Use function F69 to select the time type displayed by:
The XL-GPS’s front panel display
Select between the following types of time: 
UTC (Universal Coordinated Time)
 differs from GPS Time by the addition of leap-second 
corrections to compensate for variations in the earth’s rotation.
GPS Time 
is derived directly from the GPS constellation and doesn’t contain any leap-second 
adjustments or other GPS-to-UTC corrections.
Standard Time 
is UTC plus a time zone adjustment. For example, Pacific Standard Time is UTC 
minus 8 hours
Local Time
 is UTC plus a time zone and a daylight saving time adjustment.
The factory setting is UTC. Local Time modifies UTC time to include the Time Zone and Daylight Saving 
Time adjustments, if enabled by the user.
Related functions:
Command Line
Use the following format to display the time mode currently used:
F69<CR>
F69 responds using the following format:
F69<S><TT><CR><LF>
where:
F69
=  Function number 69
<S>
= ASCII 
space 
character.
<TT>
=  Time Type. Either GPS, UTC, LOCAL, or STANDARD.
<CR>
= Carriage 
return 
character.
<LF>
=  Line feed character.