| 摘要 |
<p>The title device has a simple and inexpensive structure and can reliably execute a writing process only once even when receiving write signals repeatedly in communication between an antenna unit and a response unit provided in the mobile object. Receiving a write signal from a write antenna unit, the tag unit (response unit) executes a process of writing the data in the data memory on condition that the completion flag is cleared by a control circuit. When the writing process is executed, the control circuit sets the completion flag. After this, even if write signals are repeatedly received in the same communication area of the same write antenna unit, the control circuit nullifies the writing proces because the completion flat is set, hence preventing multiple writing.</p> |
