Specifications

HYDROLOGICAL SERVICES
DL3 100-014 IMP
Issue 2: 15/11/2005
4.1.2 Alarms (AL, CLA, DUA, RALx, RVALx)
Alarm messages are generated when rainfall and river height conditions meet user defined alarm
criteria. An alarm will cause the following sequence of events to occur:-
1. An alarm message is constructed at the time of the alarm and saved.
2. A CLEAR sequence is performed to get the modem into a known state.
3. A CALL sequence is performed to cause the modem to dial a phone number. (If "N" appears
in the CALL sequence then a CALL NUMBER is substituted)
4. After a successful connection the previously constructed Rain or River alarm message is
transmitted. Unsuccessful connection will cause a 60 sec timeout and then return to step 2.
(This will reoccur depending on the value of RETRY)
5. A CLEAR sequence is performed again to get the modem back into a known state.
6. If there is more than one CALL NUMBER defined then return to step 2.
The logger retains a historical log of twelve alarm messages. As a new alarm is generated, the log
file is updated with the new message while the oldest message within the log is discarded. A dump
ofthe alarm log always provides the twelve most recent alarms in the order theywere generated with
the most recent message first.
The alarm flag enables or disables all alarmchecking. Each of the 3 Rain and 3 River alarms mayalso
be enabled or disabled individually. (See RALx and RVALx in this section)
On-line Help
AL?
Alarm On/Off: En or dis the alarm checking (rain & river)
Syntax: AL<CR> Displays current alarm checking state
AL=ON<CR> En
AL=OFF<CR>Dis
On-line Help
DUA?
Dump Alarm Log: Dumps Time, Date & Alarm type of last 12 alarms
Syntax: DUA<CR>
On-line Help
CLA?
Clear Alarm Log: Totally erases the alarm log
Syntax: CLA<CR> (OK when complete)