66 XLi Time & Frequency System
XLi-man, Issue 8, 6/17/2008, Rev. H
SSSSSSSSSSSS SSSSSSSSSS SSSSSSS S SSS S SSSSS S
1
To exit once-per-second or Time On Demand Output, a <^C> (Ctrl+C) character must be sent to the
command line. All other commands automatically exit after completion.
The command line (standard out) outputs the <CR> character at the end of the once-per-second string
at the 1 PPS mark, +/- 1 millisecond.
Serial Port Commands:
Where: B<N> is the option Bay Number where the FTM card is installed.
F27 B<N> <cr><lf> User formatted once-per-second output
When the XLi receives the "F27 B<N> <cr><lf>" string, the FTM card begins sending user selected data
at a once-per-second rate. The rising edge of the start bit of the last <CR> in the string is sent on time. If
all information is enabled for transmission, the formatted string is as follows:
DDD:HH:MM:SSQTsDS.thmFsU.thmSFDU.thmSTHH:MM:SS.thm<CR><LF>
For example:
068:12:17:55?T-01.537F+0.123SF+60.095ST12:17:53.463<CR><LF>
where:
To exit F27 once-per-second mode, transmit a <^C> (Ctrl+C) character to the XLi.
F27 B<N> <cr><lf> User formatted once-per-second output
F27 B<N> FS<cr><lf> Request user format string
F27 B<N> FS X,X,X,X,X<cr><lf> Set user format string
F27 B<N> TD<cr><lf> FTM data on demand output
F27 B<N> PS<cr><lf> Request Time Deviation Preset value
F27 B<N> PS +99.999<cr><lf> Set Time Deviation Preset value
DDD:HH:MM:SS Local Time of Day through seconds
Q XLi Time Quality Indicator
TsDS.thm Time Deviation Through milliseconds.’T' begins the accumulated Time Deviation in
seconds.
FsU.thm Frequency Deviation through millihertz. ‘F’ begins Frequency Deviation in Hz from
nominal, where a positive (+) value represents a frequency higher than nominal.
SFDU.thm System Frequency through millihertz. ‘SF’ begins the System Frequency, Hz. System
frequency is measured over a 1 second period.
STHH:MM:SS.thm System Time through milliseconds. ‘ST’ begins System Time, Day of Year through
milliseconds, the time a clock would display if the line voltage were used as its timing
reference.
<CR><LF> End of line carriage return at 1 PPS mark, +/- 1 millisecond.
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