BIDIRECTIONAL BUS AND TRANSMITTING, RECEIVING AND COMMUNICATION METHODS THEREFOR.

摘要

There is disclosed a communication system using a bi-directional bus, which includes a plurality of devices (e.g., TV image receiver or video tape recorder, etc.) connected to each other. Each device comprises a transmit signal formation unit adapted to form a transmit signal having a frame structure consisting of an address field for specifying addresses of devices between which communication is carried out, a control field for specifying a data communication command indicating communication of data or a control command communication command indicating communication of control command, whereby, in transmitting data, the device specifies the content of the control field of the leading frame as the data communication command to form the transmit signal; a bus output unit for outputting the transmit signal formed by the transmit signal formation unit to the bi-directional bus; a bus input unit adapted to receive the bi-directional bus; and a control unit for detecting on the basis of the content of the control field of the leading frame of the transmit signal received by the bus input unit whether current communication is communication of data or communication of control command, whereby when communication of data is detected, the control unit recognizes that the content of the data field of this frame is specified as data to carry out a control to receive data. In addition, there are also disclosed a transmitting method, a receiving method and a communication method which can be applied to such a bi-directional bus system.