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INSTALLATION ON AN ESTATE WITH SEVERAL BUILDINGS AND A
SINGLE EXTERNAL POINT OF ENTRY
6+N+COAXIAL SYSTEM
Standard wiring diagram for electronic video door
entry installations on an estate with several estate buil-
dings and a single external point of entry. The external
point of entry and the internal access points to the diffe-
rent buildings have a video system.
Operation
On a functional level this type of installation can be
regarded as the union of several installations each with
two points of entry. There is an entrance panel for each
estate building or apartment block at the external point
of entry to the estate. This panel, together with the entran-
ce panel that is on each building (internal access) are the
two points of entry or access points from where it is pos-
sible to communicate with the flats of this building. As
such, it is a system of two points of entry per building.
One entrance panel must be defined as the main panel
for each building. In this way, when the auto switch-on
system is activated from the monitor, communication
(both visual and audio) is established with this main
panel.
When one of the push-buttons on one of the entrance
panels is pressed, the audio unit activates the video unit
(connector 19) and generates an electronic call signal
(terminal 7) which is sent by the call wire to the corres-
ponding monitor (terminal 5). The loudspeaker of the
handset of the monitor emits a warning sound, informing
the house of the incoming call. At the same time, the visi-
tor hears a sound, produced by the loudspeaker of the
audio unit, which confirms that the call to the house has
been made. The video unit switches on and captures the
image of the visitor and sends the video signal to the
video unit of the internal access point (terminals M, V2)
which then, in turn, sends the signal to the monitors (ter-
minals M, V1). If the call is made from one of the inter-
nal access points, the video unit sends the video signal
to the monitors directly (terminals M, V1).
In addition, the audio unit generates a control signal
(terminal 17) which deactivates the entrance panel asso-
ciated to the entrance panel in use. If the call is made
from the access point outside the estate, then the audio
unit generates a second control signal (terminal 16)
which deactivates all the other panels of the same access
point.
The monitor is activated and connected to the power
supply terminals (terminals -,+) when it receives the call.
The monitor then sends the feed voltage (terminals V1, M)
to the top output of the tap-off to which it is connected, allo-
wing it to receive the video signal of the video unit (termi-
nals V1, M) and to show the image of the visitor.
The monitor is also connected to the common wire (2)
and to the lock release wire (1). If the handset is picked
up the audio wires (3 and 4) of the monitor are connected
to the entrance panel, establishing conversation with the
visitor. When the lock release button of the monitor is pres-
sed, the audio unit detects the closing of the lock release
circuit (terminal 1 to ground). The audio unit then sends an
alternate voltage (terminals 11 and 12) to the electric lock,
permitting the opening of the door.
All the signals are closed through the common wire (ter-
minal 2) of the monitor and of the audio unit.
Time settings established by the audio unit of the entran-
ce panel from which the call is made:
Time limit to answer the call 30 seconds
Time for conversation 60 seconds or until the handset is
replaced.
When either of the two time settings expire the audio unit
eliminates the control signal (17) and (16), and all the
entrance panels return to stand-by status.
Auto switch-on
When the auto switch-on button is depressed and always
providing that another monitor is not active, the monitor is
activated and enters into communication with the entrance
panel defined as the main panel. The audio unit of the
main panel does not generate the control voltage so it is
possible to make a call from any of the panels.
Time settings for the audio unit 30 seconds or until the
handset is replaced
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