| 摘要 |
<p>PURPOSE:To remarkably improve possibility of communication by constituting a write/read control unit to repeatedly send out commands to a data carrier at unattended error of the data carrier and to send out access commands until the re-try counter reaches a prescribed value. CONSTITUTION:A write/read control unit 6 sends out commands to a data carrier 4 through data transmitting means 5,3, repeatedly sends out commands at unattended error of the data carrier 4, and comprises a re-try counter to count up every access error to unstable territory. Further, it is provided with an auto-command sending means 7 to send out access commands until the re-try counter reaches a prescribed value. Hereby, when the data carrier 4 approaches the write/read control unit 6 and reaches the unstable territory, even if a transmitting error is generated, data communication can be performed in stable territory, because of sending out of the access commands again. Consequently, possibility of communication can be remarkably improved.</p> |
