Gira 1287 00, Руководство по эксплуатации

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Door communication bus coupler
The flush-mounted versions of the door and home stations are
connected to the 2-wire bus via door-communication bus cou-
plers.
The bus coupler has the following connections:
BUS
The devices are connected to the 2-wire bus via the BUS ter-
minals. Polarity need not be taken into account during connec-
tion, as the polarity of the door communication bus is neutral.
Floor-call button (ET)
With home stations, any push button (NO contact) can be con-
nected to the ET terminals as the floor-call button.
With the door stations, for example, a mechanical bell button
(NO contact) can be connected. This then acts like a call but-
ton from the Gira door communication system during start-up
and later operation.
The maximum cable length between the mechanical button
and the door-communication bus coupler is 20 m.
BUS
System
Video System
ET
ZV