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XLi Time & Frequency System
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XLi-man, Issue 8, 6/17/2008, Rev. H
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F27 B<N> FS<cr><lf> FORMAT SELECT once-per-second DATA
The data that is transmitted once-per-second via the "F27 B<N> <cr><lf>" command can be selected by
the user. Using this command, all FTM-II and FTM-I formatted strings can be emulated.
Data transmitted out the serial port is in the following order: Local Time, Time Deviation, Frequency
Deviation, System Frequency, and System Time. Each datum can be deselected for output using the
format string (X,X,X,X,X). e.g.,
Entering an "F27 B<N> FS<cr><lf>" requests the current format string in use by the FTM serial port. The
serial port responds with the current format string. An example follows:
F27 B<N> FS<cr><lf>user entry (requests current format)
F27 B<N> FS X,X,X,X,X<cr><lf>FTM response
The X's represent data enabled for output. A format string with Local Time and System Time deselected
would be ",X,X,X,". Note the absence of X's in those positions.
To deselect all but Time Deviation and Frequency Deviation, the following command line and FTM card
response is as follows:
"F27 B<N> FS ,X,X,<cr><lf>"
"F27 B<N> OK<cr><lf>"
The commas are necessary placeholders and the X's are in the Time Deviation and Frequency Deviation
positions.
Subsequently, when "F27 B<N> <cr><lf>" is sent requesting the once-per-second Mode, only Time
Deviation and Frequency Deviation is transmitted once-per-second.
T-00.432F-0.003<cr><lf>
T-00.432F-0.003<cr><lf>
F27 B<N> PS<cr><lf> REQUEST TIME DEVIATION PRESET VALUE
To request accumulated Time Deviation, enter:
F27 B<N> PS<cr><lf>
F27 B<N> PS +99.999<cr><lf> SET TIME DEVIATION PRESET VALUE
Accumulated Time Deviation can be preset to a given value in the range of +99.999 to -99.999 seconds.
When executed, this command presets the accumulated Time Deviation value to the entered value. All
previously accumulated Time Deviation is lost. Example sessions follow:
Preset accumulated Time Deviation to -1.0 seconds. Enter:
Local
Time
Time
Deviation
Frequency
Deviation
System
Frequency
System
Time
X
,X
,X
,X
,X
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