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3.6.9 LO FREQUENCY = FRQ
The SET command requires one parameter which is twelve digits in length representing the LO
frequency in Hz. Leading zeros must be used with frequencies below 10 GHz. If no alarms
exist, this command also unmutes the output.
Remote Command Sequence: $FRQffffffffffff
Unit Response: $FRQ
The QUERY command requires no parameters. The reply will consist of twelve digits indicating
LO frequency in Hz. Leading zeros will be used for frequencies less than 10 GHz.
Remote Command Sequence: ?FRQ
Unit Response: ?FRQffffffffffff
FRQ: Frequency indicator
ffffffffffff: Twelve-digit ASCII numeric characters indicating frequency in Hz.
3.6.10 ALARM LOG = LOG
The only SET command clears the unit log of its contents.
Remote Command Sequence: $LOG00
Unit Response: $LOG
The QUERY command requires a two-digit parameter indicating the log entry to be examined.
If entry 00 is queried, the unit returns the number of log entries currently in the log, otherwise
the unit responds with the date, time and a code indicating the event which has occurred.
Remote Command Sequence: ?LOGnn
Unit Response: ?LOGnnCyyyymmddhhnnssEeee
nn: Two digit ASCII numeric characters, MSD transmitted first, LSD last.
Indicating the log entry queried.
C: Calendar / Clock indicator.
yyyy: Year, four digit ASCII numeric characters
mm: Month, two digit ASCII numeric characters
dd: Day, two digit ASCII numeric characters
hh: Hour, two digit ASCII numeric characters
nn: Minute, two digit ASCII numeric characters
ss: Second, two digit ASCII numeric characters
E: Alarm indicator.
eee: Event Code 001 to 255 represents the following:
Event Indicator
Event
001
Unit startup
002
+15.3V power supply fault
003
+15.3V power supply fault recovery
004
-15.3V power supply fault
005
-15.3V power supply fault recovery
006
+5.3V ‘A’ power supply fault