| 摘要 |
PURPOSE:To judge reception depending on the state of a reception buffer, or the state of a data processing section or a data content in an information packet by providing 2 kinds of reply return modes at the time of receiving the information packet. CONSTITUTION:A 1st data processing module 11-1 is provided with a packet header detection section 21 connecting to a loop transmission line 12-M. An information packet reception section 22 and a reply packet reception section 23 to output a packet upon the receipt of the packet addressed to its own module connect to the detection section 21. Moreover, a packet passing section 25 connects to the detection section 12 to pass a packet not relating to itself. A packet output section 26 is used to send a packet to a loop transmission line 12-1, and a reply packet A transmission section 27, a reply packet B transmission section 28, and an information packet transmission section 29 are connected to the section 26. The transmission section 29 sends an information packet read from a packet transmission buffer section 31. |
