X
X
L
L
D
D
C
C
M
M
A
A
N
N
.
.
d
d
o
o
c
c
3
3
-
-
4
4
8
8
R
R
E
E
V
V
E
E
Sample request:
F13<CR>
Response: F13
40.000000000<CR><LF>
3-214 SERIAL FUNCTION F14 - EXTERNAL OSCILLATOR PARAMETER ENTRY/REQUEST
(OPTION)
Use Serial Function F14 to set or determine the external oscillator parameters. These parameters are
used to properly configure the input circuitry and to calculate the control coefficients for disciplining the
external oscillator. The settings on power-up will be the same as they were on power-down. To
request the present values send F14<CR> to the Serial Port. The port will respond with the following
ASCII character string:
F14<SEP><FREQUENCY><SEP><TUNESLOPE><SEP><DACNOMINAL><SEP><TEMPSTAB><CR><LF>
where:
F
=
ASCII character F
14
=
the function number
<SEP>
=
one or more separator characters: space, comma or tab
<FREQUENCY>
= the external oscillator frequency in MHz, either 1, 5, or 10 signed
<TUNESLOPE>
= fractional frequency offset/volt sensitivity of the external
oscillator
frequency control input in scientific format:sX.XXEsXX
<DACNOMINAL>
= decimal fraction of DAC full scale voltage for nominal DACsetting
which corresponds to center frequency of the external
oscillator: XX
<TEMPSTAB>
=
unsigned peak-peak change in fractional frequency offset of the
external oscillator over the range of 0 C to +60 C in scientific
format: X.XXEsXX
<CR>
=
ASCII carriage return character (HEX 0D)
<LF>
=
ASCII line feed character (HEX 0A)
Sample request:
F14<CR>
Response:
F14 1 -2.12E-11 .50 3.00E-09<CR><LF>
To enter the external oscillator parameters send a character string with the following format:
Sample entry:
F14 5 1.00E-09 .25 5.00e-08<CR>
Response:
OK<CR><LF>
3-215 SERIAL FUNCTION F15 - EXCLUSIVE USE ENABLE
At times, it is advisable to prevent entry of data via the front panel or the IEEE port. When the
exclusive use function is enabled by the Serial Port, data entries may be made only via the Serial Port.
The front panel display and the optional IEEE port will still respond to requests for data even if the
Serial Port has exclusive use. Use Serial Function F15 to enable or disable or request the state of the
Содержание 151-600
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