Options 1250 Frequency Response Analyzer
15-10 AMK/1250/2
Remote Control Messages
Page 1 of the Status information can be interrogated externally by sending the Code
"?SN". The 1250 will reply with a number. as shown in Chapter 13, Section 7.4. The
meanings assigned to the numbers are as defined for the messages in the Display. The
additional message "0", i.e. "ready", means that the Synchroniser is ready for, but has
not yet received, the first input trigger pulse.
The fault numbers are not available externally.
Status Display Page 2
Each of the four titles on Page 2 refers to a specific soft key in the Synchroniser Menu.
All the parameters can also be set by remote control.
Status Display Pages 3 and 4
These pages contain data on the incoming trigger signal frequency, under the six
headings given below. The data is also available externally by means of the "?SF”
Command. The maximum frequency that can be displayed in 65535Hz.
Heading Meaning
INPUT FREQ The value of the current input frequency.
MAX FREQ The maximum frequency measured since lock was achieved.
MIN FREQ The minimum frequency measured since lock was achieved.
START FREQ The first frequency measured since lock was achieved.
STOP FREQ The last frequency measured.
AVGE FREQ The average of all the frequencies that have been measured,
updated four times per second.
All these parameters are updated eight times per second for input trigger frequencies
greater than 8 Hz. For trigger frequencies below 8 Hz they are updated once for every
trigger pulse.
The information available from the Status registers is only valid whilst the Synchroniser
is “on", as the last readings will be retained even when the "off” state is asserted. The
registers are automatically cleared when SYNC is turned off then on again; also by
INITialise, RESET, and by Power-Up reset.
Note that although the data in the Status registers is automatically updated, the Status
Display only changes when the Page is re-called; it does not provide a continuous
monitor.
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