X
X
L
L
D
D
C
C
M
M
A
A
N
N
.
.
d
d
o
o
c
c
3
3
-
-
1
1
8
8
R
R
E
E
V
V
E
E
The time quality character prior to satellite signal acquisition will be "?". Refer to SERIAL FUNCTION
F13 - WORST-CASE TIME ERROR REQUEST for an explanation of worst-case error. The carriage
return character <CR> start bit begins on the second, +0 to +1 bit period or +1 ms, whichever is larger.
To halt the output of time once each second, send another command character to the Serial Port. Non-
command characters will be ignored if sent to the Serial Port. If the command character C is sent to the
Serial Port prior to acquisition of time of year, then the port will output time elapsed from power-up once
each second. Once correct time has been acquired, the port will output time of year.
3-116.3 MODE F - FORMAT THE TIME MESSAGE
Use Mode F to alter the format of the time output string used in Mode C and Mode T. To set the format
send a string of the form:
FDDD<C1>HH<C2>MM<C3>SS<C4>mmmQ
where:
F
=
Mode F command.
DDD
=
three characters for days.
<C1>
=
character that will be transmitted between the days and hours.
HH
=
two characters for hours.
<C2>
=
character that will be transmitted between the hours and minutes.
MM
=
two characters for minutes.
<C3>
=
character that will be transmitted between the minutes and
seconds.
SS
=
two characters for minutes.
<C4>
=
character that will be transmitted between the seconds and milli-
seconds.
mmm
=
three characters for milliseconds.
Q
=
single character for the time quality.
If an X is used as a character in any character position, including the time quality character position,
that position and its data will be omitted from the format. Any other character except a mode command
character enables that position in the format.
There are no character transmissions until formatting is terminated. There are three ways to terminate
formatting. 1) If a command character is sent before completing the format string, the altered portion of
the format is accepted and the remainder of the format is unchanged and the new mode is entered. 2)
If an ASCII line feed character (Hex 0A) is sent before completing the format string, the altered portion
of the format is accepted and the remainder of the format uses the default and the time is immediately
output once in the new format. 3) If all 15 characters of the format string are entered, the port will
immediately output time once in the newly selected format. This new format will be used for time output
in both Mode C and Mode T.
Note that the milliseconds are not available in Mode C even though formatted. On power-up the format
will revert to the default format. Further note that the response of F mode is only accurate to about +1 s
and is intended only to indicate the current format, not to provide time information.
Summary of Contents for 151-600
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