| 摘要 |
PROBLEM TO BE SOLVED: To normally communicate with one responder without interference even when plural responders come into a communication range by making an interrogator to the identification number of a responder, sending a communication command with the identification number attaching to it and communicating with only the responder having the identification number. SOLUTION: A responder 2 adds an inherent identification number that never overlaps to response, and an interrogator 3 detects that the responder 2 which has the identification number proceeds into the range of its own communication and stores the identification number in memory. The interrogator 3 reads data to which the identification number is attached and sends a command from the acquired identification number so that only the responder 2 having the identification number can return response. The responder 2 receives it and returns designated data that is stored in its own memory as response. When the responder 2 gets out of the communication range A, the interrogator 3 eliminates the identification number stored in the memory and notifies it to a controller 4 and a host control device 5. |
