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11 Technical Specications GPS170PCI
11.7 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 dened 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 oset of local timezone related to UTC
oo:oo
oset 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'
MESZ
European Summertime, daylight saving enabled
` `
MEZ
European Standard Time, daylight saving disabled
f
anouncement of discontinuity of time, enabled during last hour
before discontinuity comes in eect:
`!'
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 eect:
`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:
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Date: 12th July 2012
GPS170PCI
