The is a specialized device—typically a low-voltage transformer or binary interface module —used in building automation and electrical control systems.

The is a hybrid approach where multiple star-configured groups are linked together by a central backbone.

Requires more wiring than other methods, as every device needs its own dedicated line to the center. 2. Bus (Daisy-Chain) Topology

In a , every LT20BIN module is directly connected to a central controller or main power hub.

For long bus runs, ensure the 24V AC output is sufficient to power the last LT20BIN in the chain.