X
X
L
L
D
D
C
C
M
M
A
A
N
N
.
.
d
d
o
o
c
c
3
3
-
-
6
6
6
6
R
R
E
E
V
V
E
E
where:
F = ASCII character F
69 = function number
<SEP>= one or more separator characters; either space, comma or tab
<TT> = Time Type. Either STANDARD, LOCAL, GPS or UTC
<LT> = line terminator, either a carriage return and line feed for output strings or
a carriage return only for input strings
Sample request: F69 STANDARD<CR>
Response: OK<CR><LF>
Sample request: F69 UTC<CR>
Response: OK<CR><LF>
3-270 reserved
3-271 SERIAL FUNCTION F71 - OSCILLATOR STATISTICS REQUEST
Use Serial Function F71 to request the internal or optional external (when operating in External
Oscillator enabled mode, see Function F07) oscillator's phase, frequency offset, drift rate and DAC
value. The phase is the instantaneous error in seconds between the oscillator and the control loop zero
servo point. The frequency offset is computed using an averaging time that is equal to the effective
averaging time of the oscillator controller. The oscillator drift rate is computed using a 24-hour average
and is the daily drift rate of the oscillator. The oscillator DAC value is the signed 16 bit integer which
controls the DAC output voltage. It ranges from 32767 to -32768. Send the string F71<CR> to the
Serial Port and it will respond with the following continuous string:
F71<SP>phase=<SIGN><MULT>E<SIGN><EXP><SP>s<SP><SP>offset=<SIGN><MULT>E<SIGN><EXP><SP><SP>
drift=<SIGN><MULT>E<SIGN><EXP>/DAY<SP><SP>DAC=<SIGN><INT><CR><LF>
where:
F = ASCII character F
71 = function number
<SP> = ASCII space character
<MULT> = multiplier, 4 digits with decimal point
E = ASCII character E for exponent
s = ASCII character s for seconds abbreviation
<SIGN> = - for negative or <SP> for positive
<EXP> = 2 digit exponent
/DAY = ASCII characters, units of drift rate
<INT> = integer, 5 digits
<CR> = carriage return
<LF> = line feed
Sample request: F71<CR>
Response: F71
phase=-5.678E-09 s offset=-1.986E-07 drift= 6.013E-08/DAY DAC=
24567<CR><LF>
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