| 摘要 |
A system arranged to control the internal environment of a building includes a data network. The network comprises a plurality of networked devices associated with control of the building's internal environment and a network-address server for supplying a network address to each networked device. A first device of the plurality of networked devices is configured to request from the network-address server a network address for said first device, and if no network address is supplied, supply itself with a fail-over network address. The first device is configured to broadcast to other networked devices within the network, if no network address is supplied, a signal or signals indicating that the network-address server has failed. A second device of the plurality of networked devices is configured to respond to the signal or signals broadcast by the first device by acquiring a fail-over network address compatible with the network address supplied by the first device to itself.
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