| 摘要 |
PURPOSE:To process many data at a high speed by selecting one of carrier waves received a communication permitting signal at the time of communication request to start transmission and retransmitting a signal immediately after a communication permitting signal is received when no communication is requested. CONSTITUTION:When data transmission is started, each communication node receives a data transmission request signal RS and a token is supervised by token receiving detection circuits TKNCHK0; TNKCHK1. A carrier wave receiving the token at first is selected by a selecting circuit SEL. The token of the selected carrier wave is fetched once by the node, and after the end of data transmission from the node, the token is transmitted onto the bus by the carrier wave after a logical preceding tone address is provided. A carrier not selected and a token having no data transmission request are transmitted immediately onto the bus after being provided with the logical preceding node address. |
