21
Format of the SAT time string
The SAT time string is a sequence of 29 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.ssMEzzxy<CR><LF><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)
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)
zz
time zone indicator:
‘Z ‘ MEZ
European Standard Time, daylight saving disabled
‘SZ’ MESZ European Summertime, daylight saving enabled
x
clock status characters:
‘*’
DCF77 clock currently runs on XTAL
GPS receiver has not checked its position
‘ ‘
(space, 20h) DCF77 clock is sync'd with transmitter
GPS receiver has determined its position
y
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
<CR>
Carriage return (ASCII code 0Dh)
<LF>
Line feed (ASCII code 0Ah)
<ETX>
End-Of-Text (ASCII code 03h)
