초록 ▼

A power line carrier communication system having a carrier current transceiver (CCT) interface with an electrical power line via a buffer which automatically provides a low output drive impedance while transmitting, and a high receiving impedance when receiving, all with solid state circuitry. The l

A power line carrier communication system having a carrier current transceiver (CCT) interface with an electrical power line via a buffer which automatically provides a low output drive impedance while transmitting, and a high receiving impedance when receiving, all with solid state circuitry. The length of signal transmission by the CCT is monitored and automatically prevented from continuously loading the communication network in the event of a malfunction which causes a signal transmission to exceed normal maximum transmission time. Prevention of continuous loading of the communication circuit is accomplished without adverse affect on the CCT via a crowbar circuit connected to the buffer circuitry.

대표청구항 ▼

A power line carrier communication system for sending and receiving communication signals over an electrical power line, comprising: a carrier current transceiver (CCT), a bi-directional coupling interface disposed between said CCT and the electrical power line, said CCT having an input/output (I/O)

A power line carrier communication system for sending and receiving communication signals over an electrical power line, comprising: a carrier current transceiver (CCT), a bi-directional coupling interface disposed between said CCT and the electrical power line, said CCT having an input/output (I/O) port for receiving serial signals (RX Signals) from the electrical power line, and for applying serial signals (TX Signals) to the electrical power line, via said coupling interface, said coupling interface including impedance means connected to provide a predetermined high receiving impedance, and solid state switching means automatically operative in response to TX Signals to effectively bypass the impedance means which provides the high receiving impedance and provide a predetermined low output drive impedance.