Wiring the X-BUS interface
Installation & Configuration Manual
All expanders/keypads are fitted with termination jumpers, as default, allowing
termination on all the devices. This is imperative for the spur (chain) configuration,
as the jumper acts as a resisting terminator cancelling echoes on the line.
Within the loop wiring configuration all expanders/keypads are fitted with a jumper,
as default, allowing termination on the device.
Spur configuration
10.1.3 Star and multi-drop configuration
Please read the section for wiring examples [âž™ 79] and the section Shielding
[âž™ 80] before starting the installation.
The star and multi-drop cabling methods enables takeover of existing wirings with
four-core cables in small buildings (typically homes) with low electrical noise
environment. These wiring methods are limited to the specifications below:
The performance in star or multi-drop configuration wiring is limited due to non-
optimal conditions of the RS-485 bus specification (reduced signal quality due to
multiple receivers/transmitters in parallel with unbalanced terminating resistors).
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