| 摘要 |
<p>Data communication apparatus enables data devices DD1-DD10 to communicate via electronically conductive cabling (2) and comprises a master unit MU adapted for connection to the cabling and a plurality of slave units SU1-SU10 corresponding in number to the number of data devices DD1-DD10 enabled to communicate, the slave units being adapted for connection to the cabling and to the data devices. The master device MU is an electronic data processing device adapted to transmit via the cabling (2) in accordance with a protocol respective signals both identifying the individual slave units SU1-SU10 and enabling transmission therefrom as appropriate and to receive signals via the cabling from the slave units indicative of their state. Each slave unit SU1-SU10 is an electronic data processing device adapted to receive the identity signals via the cabling (2) and to respond uniquely to its own signal by transmitting signals via the cabling indicative of its state, by transmitting information data signals from its data device to the cabling and/or by receiving data signals from the cabling for its data device.</p> |
