TrueTime 151-602 - 3-250 SERIAL FUNCTION F50 - POSITION ENTRY;REQUEST

X
X
L
L
D
D
C
C
M
M
A
A
N
N
.
.
d
d
o
o
c
c
3
3
-
-
5
5
6
6
R
R
E
E
V
V
E
E
where:
<FFO> = fractional frequency offset of the input frequency relative to its
nominal frequency in this fixed field scientific notation format:
sX.XXXXXXXXXXXEsXX
Sample command: F29 PERIODIC 10 100<CR>
Response: F29 124:23:08:10.000956789 PERIODIC 10 MHZ 100 SEC<CR><LF>
Result: A 10 MHz input frequency is continually measured and reported over 100
second measurement intervals.
Sample measurement sent either from PERIODIC mode or on request from QUERY mode:
Response: F29 123:21:37:56.000894320 -2.89345678245E-04<CR><LF>
3-230 through 3-249 reserved
3-250 SERIAL FUNCTION F50 - POSITION ENTRY/REQUEST
Use Serial Function F50 to enter or request the current antenna position. Since Function F50 returns
the most recent fix computed by the GPS core module, not the long term averaged position which is
calculated during the AUTO mode of operation and reported via Serial Function F56, its use is mainly
for initializing the approximate position of the GPS core module at new installations or after loss of non-
volatile RAM back-up power.
The as-shipped default for position is that of the TrueTime factory in Santa Rosa, California. The
position on power-up will be the same as it was prior to power-down. To determine the present position
send F50<CR> and the Serial Port will respond with the following continuous one line string:
F50<SP><SIGN><SP><DEG>d<MIN>'<SEC>"<SP><SIGN><SP><DEG>d<MIN>'<SEC>"<SP><SP><SP>
<SP or -><ALT><UNITS><SP>pdop<SP><PDOP><LT>
where:
F = ASCII character F (f or F for input string)
50 = function number
<SP> = ASCII space character
<SIGN> = N or S for latitude; E or W for longitude; or + or - for longitude, latitude or
altitude (-) corresponds to S or W or no character, <SP> for + altitude
<DEG> = two-digit degrees for latitude or three-digit degrees for longitude
d = ASCII character d (d or D for input string always d in output string)
<MIN> = two-digit minutes
' = ASCII character '(' m or M for input string -- always ' in output strings)
<SEC> = two-digit seconds + 1 digit 10ths of seconds
" = ASCII character "(" s or S for input string -- always " in output string)
<ALT> = altitude in feet or meters
<UNITS> = unit of altitude, either a M or m for meters or F or f for feet depending on the
units selected with Serial Function F55
<PDOP> = 3 or 4 digit value of the position dilution of precision
<LT> = line terminator, either a carriage return and line feed for output strings or a
carriage return only for input strings