TEMA TELECOMUNICAZIONI SRL
Doorphone AA-539
MAS-AA539-REV02EN
Page 18 of 57
It is finally possibile to force the activation of the camera entering a special DTMF code stored in parameter 177.
When the camera is set on in this way, it will remain active for the duration of the conversation.
6.11. External contacts acquisition for special services
AA-539 has the possibility to monitor and acquire the status of 3 external contacts 3 to make reports released from
the normal operation as doorphone.
In the following descriptions of the associated services with the acquisition of these external contacts, the reference
to them will be as generic "alarms".
For each available input it is possible to associate a phone number that will be called when the input is triggered. It
has a maximum of three separate acquisition inputs, and then up to three different numbers. The parameters in
which to store the telephone number are the 251, 252, 253 respectively for input 1, 2, 3. It is possible, for each
input, to determine the condition of the activation of it.
Normally, the closing of an external contact connected to the corresponding input triggers the signal sequence but
it is also possible to reverse this logic, the trigger can be done following the opening of the contact connected to the
input. The parameters that define how to activate the triggering of the alarm are the 188, 189, 190 respectively for
input 1, 2, 3.
AA-539 continuously monitors the status of the 3 contacts and when a triggering condition is detected, will be
stored it in a nonvolatile memory (EEPROM). AA-539 will begin to call the person who will manage the situation at
the programmed telephone number and plays, for the time set in parameter 101, a variable number of beeps based
on the fact that the triggering event has been generated from input 1 (1 beep), input 2 (2 beeps) or from the input 3
(3 beeps).
For each input it is possible to define a code acquisition / acknowledgment of the alarm signal that the called
person must type to inform AA-539 of taking charge of the alarm as notified. These codes are defined in the
parameters 192, 193, 194 respectively for input 1, 2, 3.
If the called number is busy or does not answer, or in any other case in which AA-539 still does not receive the
code acquisition / acknowledgment, at the end of each call attempt AA-539 returns in stand-by and prepares itself
for a new alarm notification.
The number of times in which the alarms are notified and the time between one notification attempt and the next
are common for all 3 contacts and are defined in the parameters 186 regarding the number of attempts and 187 as
regards the interval of time between the single attempts.
At the end of the notification attempts or if during notification AA-539 receives the correct code of acquisition /
acknowledgment for the alarm in progress, the alarm signaling condition stops and no further notification calls will
be carried.
In order to be re-triggered the notification phase of activation, it is necessary that the condition that had triggered
the earlier notification was cleared. Only at the occurrence of a new condition of activation of the contact AA-539
stores it, and the cycle of alert notification calls restarts again.
In practice: if a contact connected to one of its inputs is closed and it is detected as active, AA-539 begins to make
warning calls. If the person called by the system answers and correctly insert the acquisition code, the calls will be
terminated. If the contact that had triggered the alert remain closed (this obviously depends from the device that
controls the external contact) it will NOT be triggered another cycle of warning! To have new alerts for this contact it
is necessary that it come back in stand-by (reopening) and then, on its new possible subsequent closure, will be re-
detected by the AA-539 system with new telephone notification attempts.
