| 摘要 |
PURPOSE: To speedily solve the collision of addresses among plural devices even it occurs by retransmitting a response to which its own device address is added when the address in a reception command does not match all device addresses. CONSTITUTION: The respective devices have no fixed addresses and execute mutual communication by using addresses which are generated at random at the time of starting. In a column where the respective random numbers of devices B, C and D are set to be 2, 4 and 5, a device A requests the address of an opposite device by an XID(0) command with the first frame 1000 among a series of frames. The device B receiving the command makes the response with a response frame 1009 and the device D with a frame 1012. When 1009 and 1012 are transmitted in the same frame by chance, they interfere each other and the address which the device A receives does not match the addresses of all the devices. At that time, the device A retransmits a response frame 1003 to which its own address is added. Thus, the device B makes the response with a frame 1010, the device C with a frame 1011 and the device D with a frame 1013 without collission. |
