TRAK MODEL 9100 MODULAR FREQUENCY/TIME SYSTEM
3-20
TM4400013 Rev D
Set/Request time mode
This command selects GPS, UTC or Local for all time outputs in the unit. Hours and minutes offset between
time zones can be entered. If GPS is selected, the offset between GPS and UTC is updated automatically when
the unit tracks satellites.
Any changes to these parameters should be made after power-up and before antenna position averaging takes
place.
Warning: UTC is the default time mode and is normally used in most applications. If the time mode is
change to local or GPS, the IRIG B, TOD port and optional NTS will output time in the selected
mode.
Request mode:
Host sends: X.STM<CR>
9100 replies: X.STM t,ooo,mm<CR><LF>
Where: t is a "G" if GPS
t is a "U" if UTC
t is a "L" if LOCAL
ooo is the signed offset value in hours (±HH) for Local
mm is the offset in minutes (00-59) for Local
X is described on command summary page
Set mode:
Host sends: X.STM t,ooo,mm<CR>
9100 replies: X.STM DONE<CR><LF>
Where: Same as for STM Request mode
Note: The minor time mode is set to UTC if UTC or LOCAL are selected and GPS if GPS is selected. It is not
necessary to enter the hours and minutes offset when switching to LOCAL time. The unit will use the last
entered offset values if none are specified.
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