| 摘要 |
<p>PROBLEM TO BE SOLVED: To execute delivery acknowledgement of transmission data and resending of data and to certify the transmitting order of data in the case of simultaneously transmitting data such as command information to plural commanding destinations. SOLUTION: A transmitter 1-1 simultaneously transmits data such as command information to plural receivers 1-2 by an IP multicast communicating procedure. Each receiver 1-2 receiving data by the IP multicast communicating procedure sends the message of delivery acknowledgement back to the transmitter 1-1 by a TCP/IP communicating procedure. The transmitter 1-1 resends data to the receiver from which the message of delivery acknowledgement is not sent back by the TCP/IP communicating means. In addition, the transmitter 1-1 adds a sequence number to transmission data and transmits it, and the receivers 1-2 are provided with a function of rearranging received data based on the sequence number.</p> |
