EndRun Tempus LX GPS, User Manual

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T e m p u s L X G P S U s e r M a n u a l 46
C H A P T E R S I X
47 T e m p u s L X G P S U s e r M a n u a l
C O N T R O L A N D S T A T U S C O M M A N D S
+S.ssssss is the offset in seconds between the NTP system clock and the GPS subsystem clock.
Positive implies that the system clock is ahead of the GPS subsystem clock.
TFOM = ? A detailed explanation of TFOM is in Appendix E - Time Figure-of-Merit .
Briefly, TFOM indicates clock accuracy where:
4 time error is < 1 us
5 time error is < 10 us
6 time error is < 100 us
7 time error is < 1 ms
8 time error is < 10 ms
9 time error is > 10 ms, unsynchronized state if never locked to GPS.
YEAR is the year of the UTC timestamp of most recent NTP polling request received by the
GPS engine from the NTP reference clock driver.
DOY is the day-of-year of the UTC timestamp of most recent NTP polling request received by
the GPS engine from the NTP reference clock driver.
HH:MM:SS.sssssssss is the hour, minute, second.subsecond UTC timestamp of the most
recent NTP polling request received by by the GPS engine from the NTP daemon
reference clock driver.
LS is the current number of leap seconds difference between the UTC and GPS timescales
(13 at the time of this writing).
Query:
gntpstat
Tempus LX response:
LOCKED TO GPS, Offset = +0.000024, TFOM = 4 @ 2001 092 06:03:10.904312858 13
gntptimemode
This command displays the current time mode settings for the front-panel display or any optional
time code or Serial Time outputs. The displayed Local Time Offset from UTC and the DST Start/
Stop parameters are only valid when the Time Mode is LOCAL. A positive Local Time Offset im-
plies a longitude east of the Greenwich meridian and that local time is ahead of UTC.
Query:
gntptimemode
Tempus LX response:
Time Mode = LOCAL
Local Time Offset from UTC = -16 (half hours)
DST Start Month = Apr Sunday = 1st Hour = 02
DST Stop Month = Oct Sunday = Last Hour = 02
gntptimemodeconfig
This command starts an interactive shell script that will allow the user to configure the time mode of
operation of any optional timecode outputs or front panel vacuum fluorescent display of the Tempus
LX. These settings have no effect on the operation of the NTP daemon or the underlying Linux oper-
ating system time. These ALWAYS operate in UTC.
By default, the unit is configured to operate in LOCAL mode with an offset to UTC of zero and with
Daylight Savings Time disabled. If you need to modify this operation, you must run this script as
root. Settings made using this command are non-volatile.