| 摘要 |
<p>The device comprises a reading head, a writing head, and a serialising module which receives parallel information from the reading head and converts it into series information, inverting start, parity and end bits. The signal thus created is transmitted to the writing head to control a static interrupter (8) of the writing head. The interrupter opens and closes, at a frequency set by the received signal, on active loop formed by a printed circuit coil (9) tuned to the frequency of the reading head oscillator. The tuned circuit can either absorb or not absorb the oscillator energy, the absorption appearing at the oscillator output. The information is then translated into parallel information which appears at the reading head only if the information is valid, otherwise a fault signal is generated.</p> |
