Wiring the X-BUS interface
Installation & Configuration Manual
Star configuration
All expanders/keypads are fitted with a termination jumper by default. In star
configuration it’s imperative to remove these jumpers.
A star configuration is established when multiple expanders are wired back to the
same X-BUS port on the SPC controller. Depending on controller type 2 ports may
exist (1A/1B, 2A/2B), however only one port (1A/1B) is to be used on each keypad
or expander.
In the case of a X-BUS break the single will be disconnected, all other expanders
and detectors continue to be supervised. A short in the cable renders all expanders
disabled.
Star configuration
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