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
Number Description
1 Controller
2-4 Expanders
10.1.3 Star and multi-drop configuration
NOTICE:See Examples of correct wiring on page81, Examples of incorrect wiring on page82 and
Shielding on page83 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:
SPC42xx/SPC43xx SPC52xx/SPC53xx/SPC63xx
Max. expanders/keypads 8 16 (8 per X-BUS port)
Total cable length 200 m 200 m
NOTICE: 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).
SPC4xxx/5xxx/6xxx – Installation & Configuration Manual Wiring the system
© Vanderbilt 2018 78 A6V10276959-d
11.2018
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