Siemens SPCK421 Dokumentacja Strona 43

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Wiring the system
9
Wiring the X-BUS interface
43
Siemens AB
A6V10276959
Security Products
18.11.2011
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
1
Controller
2-4
Expanders
9.1.3 Star and multi-drop configuration
NOTICE
Please read the section for wiring examples [47] and the section Shielding [
48] 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).
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