9
INTERCOMMUNICATING VIDEO DOOR ENTRY SYSTEM WITH
SWITCHING MODULE TYPE 935A
SYSTEM DESCRIPTION
The diagram shows the connection of one monitor and 7 interphones (all intercommunicating with each other and with the out-
door unit). More or fewer monitors and interphones may be connected, but the total number must not exceed 8 units correspon-
ding to the number of push-buttons. When the total number of units is less than 8, only the terminal blocks of concerned inter-
communicating units must be linked, excluding the call conductors of the other numbers.
Example: In the case of 3 intercom units (one monitor and 2 interphones as illustrated in the diagram above), connect terminal
boards 1 to 11 on the interphones.
The monitors and interphones are fitted with loudspeakers capable of receiving separate electronic call signals both from the
outdoor unit and from other intercommunication devices. The calls from entrance panel (C1) and from the apartment door but-
ton (C2) are generated by the power supply Art. 6680, while the intercommunication call signal (C3) is supplied by the switching
module Art. 935A.
OPERATING PRINCIPLE
The video door entry system consists of one camera entrance panel, one power supply and one or more monitors. When a
push-button of entrance panel is pressed, the ringtone rings in the corresponding apartment. Almost immediately the image of
the caller appears on the monitor. A number of built-in infrared LEDs lights the coverage area when using a B/W camera, or
LED with white light when using a colour camera. If desired, the user may simply raise the interphone, communicate with the
caller and, if appropriate, activate the door lock release. In this case the the door-opening time may be varied from 1 to 30
seconds using potentiomenter P3. The system turns itself off automatically after a preset time, adjustable from 30 to 90 seconds
using potentiometer P1 inside the power supply.
EXTERNAL COMMUNICATIONS:
When the external call signal is heard, pick up the interphone to directly communicate outside. 60 seconds after the start of the
conversation an electronic device within the switching module type 935A switches communication to internal only, and so to
continue the conversation it is necessary to call again from the entrance panel.
IINTERNAL COMMUNICATIONS:
Lift interphone and press push-button corresponding to desired interphone. Speech unit is automatically excluded.
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