Vanderbilt SPC42 Series Installation & Configuration Manual page 77

Star configuration 2
1 SPC Controller
2-4 Expanders
Multi-drop configuration
Vanderbilt
Multi-drop configuration
NOTICE
All expanders/keypads are fitted with a termination jumper by default. In multi-
drop configuration it's imperative to remove these jumpers with exception of last
keypad or expander.
The multi-drop configuration varies in that each expander uses the same
communication channel as it wires onto the next expander, with all expanders
using the same input channel. See multi-drop configuration in the second figure.
In the case of a X-BUS break, all expanders and detectors up to the fault continues
to be supervised. A short in the cable renders all expanders disabled.
Installation & Configuration Manual
Wiring the system
Wiring the X-BUS interface
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