Patent ID: 7017072

Claim:
A protective circuit comprising: a first transceiver to connect to a first network section; a second transceiver to connect to a second network section; and a logic isolation circuit to isolate a network section from a bus system network using logic when a fault state is recognized in the network section, the logic isolation circuit comprising a reception multiplexer having a first signal input connected to a first transceiver receiver and a second signal input to receive a logically recessive transmission signal; and a transmission multiplexer having a signal output connected to one of the transceiver transmitters and a first signal input connected to a signal output of the reception multiplexer for the transceiver receiver, wherein a logically recessive transmission signal is applied to a second signal input of the transmission multiplexer; wherein a first transceiver receiver in the first transceiver recognizes a fault state in the first network section, and a second transceiver receiver in the second transceiver recognizes a fault state in the second network section, and the logic isolation circuit includes logic signal inputs to connect to both receivers and logic signal outputs to connect to transceiver transmitters.