Wiring the X-BUS interface
Installation & Configuration Manual
Wiring expander
Most expanders are equipped with additional terminals 3A/3B and 4A/4B for
branch expander wiring. See page [âž™ 81] for instructions on branch expander
wiring.
10.1.1 Loop configuration
The SPC42xx/43xx doesn’t support loop configuration (only 1 X-BUS
port).
All expanders/keypads are fitted with a termination jumper by default. In loop
configuration it’s imperative to have these jumpers fitted.
The loop (or ring) cabling method offers the highest security by providing fault
tolerant communications on the X-BUS. All keypads and expanders are supervised
and in case of a X-BUS fault or break, the system continues to operate and all
2A
2B
1A
1B
2A 2B 1A 1B
1A 1B 2A 2B
1
2
3
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