TEMA TELECOMUNICAZIONI SRL
Doorphone AA-514
MAS-AA514-REV03EN
Page 12 of 56
5. OPERATION
When, in standby condition, someone press one of the call buttons on the AA-514 base system or on the AA-516P
expansion or is dialed a number on the AA-516K 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-514 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-514.
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-514
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 before the expiry of timeout, AA-514 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-514 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-514
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-514 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-514 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-514 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-514 and its expansion modules AA-516P, AA-516K, AA-516R have the possibility to activate an internal heating
circuit that can be inserted via an internal jumper. AA-514 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 connecting power supply and contacts).
5.1.
Buttons and numeric keypad expansions
Adding the AA-516P expansion, it is possible to have 8 extra buttons, to get up to 12 call buttons in total. Adding
instead the AA-516K 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-514 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.
