TEMA TELECOMUNICAZIONI SRL
Doorphone AA-539
MAS-AA539-REV02EN
Page 13 of 57
5. OPERATION
When, in standby condition, someone press the call button on the AA-539 base system or is dialed a number on
the AA-539K numeric keypad, the doorphone automatically generates a telephone call through the connected
internal extension of the PBX.
In systems equipped with video camera, this is activated at the beginning of the call and the images made available
on the connected monitor, until the end of the conversation. There are other operating modes available, such as to
keep it always on or off.
The visitor begins to listen from the louspeaker of AA-539 the result of his access request whether or not
accompanied by a voice message. The visitor will then hear the first ringing control tone, then the reply from the
operator who was called by AA-539.
The operator who answered may then decide to activate the electric lock directly typing the correct sequence of
programmed DTMF digits (door opener code). After the opening pulse, the audio connection can be automatically
closed or the operator himself can type on the keyboard of his phone the hang up code or simply hang up (AA-539
will detect the reorder tone). In addition, a programmable conversation time-out provides to limit the maximum
duration of the call. When there are less than 30 seconds after the expiry of timeout, AA-539 will play a warning
tone. It is possible to extend the duration of the call by typing the recharge time code.
It is also possible for the operator or other extensions, to reach the telephone number where AA-539 is connected
for example to make a programming, to change the operating mode or to directly activate the two integrated relays.
It is possible, within certain limits, to adjust the loudspeaker output level and the microphone sensitivity of AA-539
in order to better adapt to the acoustic characteristics of the area or environment where it is installed. It may be the
case that when AA-539 is installed in particular area or gates, the audio conditions are particularly "difficult" and
you hear the typical Larsen effect due to feedback during the conversation. The characteristics and the
loudspeaker level and microphone adjustments of AA-539 are made at the factory and normally allows to
overcome these situations without having to take other special precautions. Finally, there is the possibility to enable
the noise reduction to improve the calls audio quality.
AA-539 allows to manage the two built-in electromechanical relays in two different modes, active with normally
closed contact and active with normally open contact. In the first case, when the operator gives the activation
command, the relay is activated while in the second case, the exchange of the relay (normally activated) is
deactivated at the reception of the command.
AA-539 and its expansion modules AA-539K, AA-539R have the possibility to activate an internal heating circuit
that can be inserted via an internal jumper. AA-539 and its expansion modules also have the possibility to activate
the label holder backlighting or keyboard backlighting in a fixed way or in some cases also automatically when
switching between Day and Night mode. The backlight is activated permanently via an internal jumper and
automatically through the built-in second relay (by properly connecting power supply and contacts).
5.1.
Numeric keypad expansion
Adding the AA-539K expansion it is possible to have the telephone keypad that allows some additional services.
There is for example the possibility for the visitor to directly call a phone number, or to call the numbers
(appropriately pre-programmed in the parameters) of the Speed Dial operating. See for example the case of a
possible visitor who goes to the entrance of a building site and among the dozens of companies on the job site
must conctat one in particular: just provide a legend in the proximity of the device that has the instructions and the
various numbers to call to get in touch with the person of each company. The same operation mode may be
applicable in public facilities, large buildings and other environments. The calls (if allowed by the appropriate class
of service of the extension number assigned to AA-539 on the PBX) can also be made to mobile phones or trunks
and not only just to the extensions of PBX to which it is connected.
It is also possible to compose only the final part of the number using the operation mode with a root number. In this
case the system prepends to the dialed number on the keypad a pre-programmed prefix. For example, if the root
number is "3" and the user types on the keyboard "14", the system will associate the prefix and dial the number
"314". This service is also found useful to mask the true extension number of the person to contact.
In addition, this field or service may be used to avoid to make calls directly from the system, when equipped with a
AA-539K keypad, engaging the external lines of the connected PBX. In fact, if a visitor will try to make dial
02123456, the system will call 302-123456 preventing the external call. The direct dialing mode is NOT an
alternative to the speed dialing mode and can both work.
