The xl-gps responds in the following format, The xl-gps clears alarm latches and responds, F73 latch – Symmetricom XL-GPS User Manual
Page 79: F73 clear alarm latch

997-01530-01, Rev. C-25, Jan 2008
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To display the latched faults, enter:
F73 LATCH
The XL-GPS responds in the following format:
F73
The values in <123456789ABCDEFGHIJ> field indicate the latched faults, if any, which have occurred
since the last time Alarm Latch was cleared.
To clear the Alarm Latch, enter:
F73 CLEAR ALARM LATCH
The XL-GPS clears Alarm Latches and responds:
OK
The user can enable or disable the alarm indicators using the MASK command. To display the current
mask, enter:
F73 MASK
The XL-GPS responds in the following format:
F73
A
=
'-' DAC OK
'X' DAC Fault
B
=
'-' First time lock OK
'a' Clock has locked since power on but still within the user defined power on time out
'A' Clock has not locked since power on
C
=
'-' Time error OK
'U' Time error Fault
D
=
'-' Timeout OK
'T' Timeout Fault
E
=
'-' NTP OK or option not enabled
'N' NTP Fault
F
=
'-' Future Use
G
=
'-' Future Use
H
=
'-' Future Use
I
=
'-' Future Use
J
=
'-' Future Use