| 摘要 |
PURPOSE:To release the data transfer packet after data transfer and to make effective use of other communication control unit, by providing the control packet for inquiry/response in one frame. CONSTITUTION:In one frame information taking ahead the synchronizing pattern SYNC3, the inquiry/response control packets 5-0-5-3 (consisting of each field of control information, addressed address, transmission original address and response) together with the data transfer packets 4-0-4-2 are provided. When the communication control unit 2-0 of the data highway linked in ring shape communicates with the communication control unit 2-2 by using the packet 4-1, each address and electric message of the units 2-0 and 2-2 are written in the packet 4-1, the unit 2-2 acknowledges the address itself and receives the message, and next, any one response field of the control packet is used to inform the reception state to the unit 2-0, and the packet 4-1 is released in this stage, allowing to use for other communication control units. |
