Vanderbilt SPC4 Series Installation & Configuration Manual page 79

SPC4xxx/5xxx/6xxx – Installation & Configuration Manual
Star configuration
NOTICE: 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
Star configuration 2
© Vanderbilt 2018 79
Wiring the system
A6V10276959-d
12.09.2018