Audio System: Connection Of Devices To The External Bus; Topology Rules For Video Systems; Video System: Connection Of Devices On The Internal Bus; Video System: Looping The Internal Bus - ABB Welcome User Manual

Audio system: Connection of devices to the external bus

Fig. 10
The following devices, aside from the system controller, are
usually connected to the external bus of an audio system:
» ABB-Welcome audio outdoor station
» Switch actuator, door/light
Up to four outdoor stations can be connected. For each of
these, two switch actuators for opening doors and switching
lights can be used. When installing only one outdoor station,
the door opening or light function of the system controller can
be used.
The connection is made directly on their external bus. With
two or more outdoor stations, star-shaped wiring is to be
selected. The star point is to be located as close to the
system controller as possible.
It is irrelevant whether the external bus is terminated from an
audio outdoor station or a switch actuator.
Note: Neither the ABB-Welcome audio outdoor station nor
the switch actuator have a switch for the terminal resistor.
20 Planning ABB-Welcome systems | User Manual ABB-Welcome
Fig. 10

Topology rules for video systems

An ABB-Welcome video system with transmission of the
control information, of the audio signal as well as the video
signal is planned as follows:

Video system: Connection of devices on the internal bus

The devices used for setting up an audio system can also be
used for setting up a video system. This means system
controller, ABB-Welcome audio outdoor station and audio
indoor station. And, depending on the layout, the following
devices are additionally connected to the internal bus.
» ABB-WelcomeTouch
» ABB-Welcome IP gateway
» Video indoor distributor

Video system: Looping the internal bus

The 2-wire bus for a video system can be looped from device
to device similar to an audio system. This results in a continuous
bus line.
The terminal resistor must be activated on the last device of
the bus line – the switch "RC" is set to "ON". For all other
devices the switch is set on "OFF".
Video system: Internal bus stub lines
As an alternative to looping, the devices can also be
connected at the video system via stub line. In this case a
video distributor is to be used on all branch connections.
The video indoor distributor exist as MDRC unit for mounting
in a sub-distribution or as built-in device for flush-mounted
installation in a branch box. The terminal resistor must be
activated on the last device of each stub line and at the end
of the riser main – the switch "RC" is set to "ON".
Fig. 11
Fig. 12