Section 4: Software Commands
8197 Instruction Manual
Page 4-31
4.4.2
ALARM EVENT HISTORY
This command is to read
Alarm Events
. The 8197 will respond with the most
recent alarm event not yet returned by this command. When all events have
been read, the most recent event is returned with the valid entry indicator set to
‘n’ (event already read).
raeh
raeh VHHMMSSsHHMMDDMMYYYYtNTFOCsssAOGBss
where V = y or n
indicating if this entry is a valid entry, HHMMSS= time of event, sHHMM= time
zone offset of the unit, DDMMYYY= date of event, t(y/n) = 10 MHz out of
specification (AT3), N(y/n) = 9.6 kHz out of spec (AT2), T(y/n)= in test mode,
F(y/n)= in Free Run, O(y/n)= Oscillatory Failure (Frequency Alarm), C(y/n)= CPU
alarm, sss= three spares, A(y/n)= Adjust Oscillator, O(y/n)= Output fault, G(y/n)=
GPS out of spec (AT1), B(y/n)= replace battery, ss= two spares.
4.4.3 ALARM
STATUS
This command read
Alarm Status
. This is a short command designed to let the
controller know if there are any alarms present.
rast
rastC
where C = y or n indicating if there are alarm conditions present.
4.4.4 ALARM
TIMEOUTS
This command is to read or set the three
Alarm Time outs
individually. Each
time-out controls the status of an alarm relay. If the GPS receiver stops tracking
satellites, these timers start counting down. If the timer reaches 0 before the
receiver begins to track satellites again, the alarm relay is activated. In addition,
if Alarm Time out 1 occurs, this is a minor alarm. Alarm Time out 2 and Alarm
Time out 3 are Major alarms. Defaults are: AT1 = 1 minute, AT2 = 2½ hours,
AT3 = 30 days.
watXDDDHHMMSS
where X = 1,2, or 3 indicating which time out.
watXDDDHHMMSS
ratX
ratXDDDHHMMSS
4.4.5
CLEAR ALARM HISTORY
This command is to
Clear the Alarm History
. This command accompanies the
raeh
command and is used to “erase” the alarm history. After this is issued,
subsequent use of the
raeh
command will respond with the valid entry character
set to ‘n’, until a new alarm event occurs.
wcah
wcah
