| 摘要 |
PROBLEM TO BE SOLVED: To reduce an average ID retrieval time in the case of performing anti-collision by making an interrogator successively transmit four specific response requests and to stop a response to a data carrier (slave unit) which does not transmit a response afterwards. SOLUTION: An interrogator transmits a multi ID recognition command and sequentially transmits a response request signal. A slave unit which has HH in the 1st and 2nd bits of a self-ID returns a response signal. It stops a response to slave unit which does not return a response after that. When a response signal does not come back from all slave unit, the interrogator continuously transmits the response request signal. A slave unit which has HL in the 1st and 2nd bits of a self-ID returns a response signal. If a response also does not come here, the response request signal is continuously transmitted and a slave unit having an ID of LH responds. If a response also does not come here, the response request signal is continuously transmitted and a slave unit having an ID of LL responds. |
