Panasonic Corporation

Makoto Nishikawa

Tadashi Matsumoto

Masayuki Amano

Shoji Koise

A communication system has a communication control unit, communication terminal units and communication units. The communication control unit and the communication terminal units communicate according to a first protocol. The communication units mutually communicate according to a second protocol. A specific communication unit of the communication units has a data analyzer and a data transmitter. The data analyzer judges whether or not second monitoring information represents a steady state. The data transmitter transmits the control information corresponding to the second monitoring information to at least one related second communication terminal unit through the communication control unit according to the first protocol if the second monitoring information represents an unsteady state. Thereby, the load connected to the second communication terminal unit is controlled.

Communication system

A communication devicehas a first protocol analysis sectionthat analyzes a status of a transmission signal Vs received at a transmission signal receiver. A transmission controllerdetermines a communication available period and a communication unavailable period based upon the analysis result. When the communication available period is determined, the transmission controllerallows a second protocol signal transmitterto transmit a packet in accordance with a second protocol to a signal line Ls. With this result, it is possible to transmit a relatively large amount of data while suppressing noise influence caused by a varying condition of a carrier, in contrast to a prior system in which the transmission signal is superimposed only by a simple determination of the carrier condition. Thus, it is possible to share the signal line Ls with the time-division multiplexing transmission system and improve reliability of data transmission.

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Ikoma, Japan

Makoto Nishikawa