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Video door entry system
3.3 VIDEO DOOR ENTRY SYSTEM.
Type of system.
The multimedia video touch screen can be used solely on video door entry systems of the Two Wire digital type;
it will therefore be necessary to use solely power supplies in the Two Wire range (for the specifications see the
relevant manuals). To create the audio and video function the type of connection, both toward the pillar and toward
the speech unit, is made with a "2 wire non-polarized" bus cable.
The Two Wire system enables making types of systems in which the identification of the devices and controls is digital.
Depending on the configuration of the system, each of the connected devices is characterized by a numerical
code between 1 and 200 (the value must be univocal) and is able to receive and send data packets containing all
the information related to the management of the communication; each data packet is composed of the identifica-
tion of the destination device and the command that the latter must actuate.
All the control operations typical of a video door entry system such as, for instance, call, electrical lock opening,
stair lighting, etc., are therefore coded.
The voice unit for the voice communication and the video signal for viewing the images instead are still analogue signals.
Lastly as regards the type of cables to use for the connection between the components of the system, both toward
the pillar and toward the speech unit, it is recommended to use the twisted bipolar BUS cable with a cross-section
of 1 mm² (type art. 732H/100 or the equivalent).
In the case of Due Fili video door entry systems where there are monitors 21550/20550/14550 combined
with the module 01963 and with the presence of By-me home automation modules 01960 (or control pan-
els with video door entry unit 01956), the following applies:
- The maximum number of indoor stations per pillar or after separator 692S, made with art.
21550/20550/14550 + 01960 + 01963, is 4 (that is a maximum of 4 independent home automation subsys-
tems connected to the pillar of the Due Fili system).
- It is possible to connect other Due Fili devices (art. 21553.2, 21554, 01955, 20557, 20577,
21550/20550/14550/+01963, etc.) up to a maximum of 32 total devices per pillar or after separator 692S.
In all the above cases, if you need to exceed the maximum number of devices, it is necessary to expand
the system by using separators 692S and their power supply units creating separate galvanic isolations.
Advantages of the Two Wire system.
The most important advantage offered by the Two Wire system, compared to other video door entry systems
(classic "8 wire + n" analogue or digital with multi-wire DigiBus), is its use in wiring the whole system with just 2
conductors, twisted and not polarized, on which the data, audio signal, video signal and necessary power supply
are conveyed to the connected devices.
Thanks to this characteristic, the system is therefore ideal to be used both in small-medium residential systems
and in large building complexes (up to a maximum of 200 indoor stations) because it considerably simplifies the
wiring operations.
Another advantage of using the Two-Wire system is its extreme flexibility in the case of subsequent system expan-
sion; it is possible, in fact, to add new indoor stations simply with the aid of the pillar without having to wire further
cables toward the power supply.
The digital management of all the commands (call bell duration, type of bell, call time duration, answer time dura-
tion, entry with password or programmed key, etc.) lastly enables programming all the parameters of the devices
according to the different requirements of each user.
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