| 摘要 |
The electronic key for disabling or enabling operation of an electrical apparatus, especially for preventing theft of a hand-held power tool, includes a transmitter and antenna for wireless transmission of a release signal to enable operation of the electrical apparatus. For passive current supply the electronic key is provided with a current supply circuit connected electrically with its antenna, in order to obtain electrical energy from an electromagnetic interrogation signal received by its antenna from the electrical apparatus. The electronic key can include a memory for one or more enabling signals for enabling operation of one or more different electrical units. The electrical apparatus includes a receiver with an antenna for receipt of the release or enable signals and a transmitter for the interrogation signal. |
