
Wiring the X-BUS interface
2A
2B
1A
1B
2A 2B 1A 1B
1A 1B 2A 2B
1
2
3
Wiring expander
Most expanders are equipped with additional terminals 3A/3B and 4A/4B for
branch expander wiring. See page [➙ 49] for instructions on branch expander
wiring.
9.1.1 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.
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