Topology Rules For The Internal And External Bus; Audio System: Connection Of Devices On The Internal Bus; Audio System: Looping The Internal Bus; Audio System: Internal Bus Stub Lines - ABB Welcome User Manual

Topology rules for the internal and external bus

Indoor stations, outdoor stations and system devices must
be connected to the system controller according to topology
rules for ABB-Welcome systems.
Topology rules for audio systems Topology rules for
audio systems
Fig. 8 Fig. 9
For planning an ABB-Welcome audio system in which, next
to control information, only one audio signal is transmitted on
a 2-wire bus.

Audio system: Connection of devices on the internal bus

The following devices, aside from the system controller, are
usually connected to the internal bus of an audio system:
» ABB-Welcome audio indoor station with handset
» ABB-Welcome audio indoor station with display
» ABB-Welcome auxiliary power supply
There are two options for wiring the devices: Looping and
branch line connections ("stub lines"). Both versions can be
combined within the one system.
Note: For all devices the terminal resistor should not be
activated – the switch "RC" is always on "OFF".
Fig. 8

Audio system: Looping the internal bus

AUDIO
AUDIO
AUDIO
AUDIO
S
AUDIO
RC – OFF
RC – OFF
RC – OFF
RC – OFF
Audio system: Looping the internal bus
For looping a continuous bus line the incoming and outgoing
2-wire bus is connected at each device as shown in Fig. 8.
A device must be connected to the end of the bus line – so
that the bus line does not remain "open". In all devices of the
audio system the terminal resistor should not be activated –
the switch "RC" is always on "OFF".

Audio system: Internal bus stub lines

As an alternative to looping, the devices can also be
connected at the end of a branch line or stub line:
» ABB-Welcome audio indoor station with handset
» ABB-Welcome audio indoor station with display
» ABB-Welcome auxiliary power supply
An example of this layout: A rising mains in a building
connects the floors and the stub lines branch off on the
floors.
Fig. 9
A topology with a rising mains and several stub lines can
easily be set up in an audio system. Here the bus lines are
switched parallel to the branch connections.
Fig. 9
Audio system: Internal bus stub line
RC – OFF
AUDIO AUDIO
RC – OFF
AUDIO AUDIO
RC – OFF
AUDIO AUDIO
RC – OFF
AUDIO AUDIO
S
AUDIO
User Manual ABB-Welcome | Planning ABB-Welcome systems 19
Fig. 8
RC – OFF
RC – OFF
RC – OFF
RC – OFF