| 摘要 |
PROBLEM TO BE SOLVED: To suppress interference more by adding dummy data on the front side of the transmission data of respective interrogators to respective responders based on synchronizing signals, turning them to a maximum data length, transmitting them within the same period, and after the respective interrogators receive response data from the respective responders within the same period, restarting transmission. SOLUTION: The respective interrogators and the respective responders of a portable type which are these non-contact data transmitter-receivers transmit and receive the data without contacting by a transmission part, a reception part, a data processing part and a control part. Based on the periods TL and TH of the synchronizing signals, the respective interrogators 1-1 to 1-4 add the dummy data on the front side of prescribed data to be transmitted and attain a prescribed maximum data length. Thus, the transmission of the data of the respective interrogators is ended within the period TL, the respective responders transmit the response data to the respective interrogators within the period TH and thereafter, the respective interrogators start the transmission of the data. Thus, even when the number of the interrogators is increased, data transmission time hardly increases, the interference is suppressed and the antenna interval of the interrogators is narrowed. |
