Übertragungssystem und Übertragungsvorrichtungen mit Verriegelungsfunktion

摘要

There is disclosed a communication system using a bi-directional bus, which comprises 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 having a frame structure consisting of an address field for specifying addresses of devices between which communication is to be carried out, a control field for specifying whether communication is to be carried out in the state where device on the receiving side is locked or in the state where that device is not locked, and a data field for specifying data to be transmitted. In transmitting data to be transmitted having a data quantity greater than data capacity of the data field in a manner divided into a plurality of frames, an indication to lock device on the receiving side is given to control field of a frame transmitted first, and an indication not to lock that device is given to control field of a frame transmitted last. The transmit signal thus indicated is transmitted through the bi-directional bus by a bus output unit. 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.