8 Time Strings
8.5 Format of the Uni Erlangen String (NTP)
The time string Uni Erlangen (NTP) of a GPS clock is a sequence of 66 ASCII characters starting with the
STX (start-of-text) character and ending with the ETX (end-of-text) character. The format is:
<STX>tt.mm.jj; w; hh:mm:ss; voo:oo; acdfg i;bbb.bbbbn lll.lllle hhhhm<ETX>
The letters printed in italics are replaced by ASCII numbers whereas the other characters are part
of the time string. The groups of characters as defined below:
<STX> Start-Of-Text, ASCII Code 02h
sending with one bit occuracy at change of second
dd.mm.yy the current date:
dd day of month (01..31)
mm month (01..12)
yy year of
the century (00..99)
w the day of
the week (1..7, 1 = Monday)
hh.mm.ss the current time:
hh hours (00..23)
mm minutes (00..59)
ss seconds (00..59, or 60 while leap second)
v sign of the offset of local timezone related to UTC
oo:oo offset of local timezone related to UTC in hours and minutes
ac clock status characters:
a: ‘#’ clock has not synchronized after reset
‘ ‘ (space, 20h) clock has synchronized after reset
c: ‘*’ GPS receiver has not checked its position
‘ ‘ (space, 20h) GPS receiver has determined its position
d time zone indicator:
‘S’ CEST European Summertime, daylight saving enabled
‘ ‘ CET European Standard Time, daylight saving disabled
f anouncement of discontinuity of time, enabled during last hour
before discontinuity comes in effect:
‘!’ announcement of start or end of daylight saving time
‘ ‘ (space, 20h) nothing announced
g anouncement of discontinuity of time, enabled during last hour
before discontinuity comes in effect:
‘A’ announcement of leap second insertion
‘ ‘ (space, 20h) nothing announced
i leap second insertion
‘L’ leap second is actually inserted
(active only in 60th sec.)
‘ ‘ (space, 20h) no leap second is inserted
bbb.bbbb latitude of receiver position in degrees
leading signs are replaced by a space character (20h)
n latitude, the following characters are possible:
SyncBox N2X Date: 17th September 2019 31
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