| 摘要 |
Apparatus for automatic and semiautomatic remote control of an antitheft protection device of a property is provided. In the automatic embodiment, the apparatus includes a portable transmitter actuated through an encoder, which is programmed for controlling the continuous transmission of message signals timed one from the other at much longer intervals than the message length. The apparatus further includes a receiver having a decoder for matching the signals sent by the transmitter, and as a consequence, controlling the disconnection of the protection device when the message is received and to control connection of the device upon stopping of the reception of the programmed codified signals. The device is thereby operated automatically when a person carrying the transmitter moves away from or approaches the property. In the semiautomatic embodiment, the decoder is reprogrammed upon connection of the protection device, so that thereafter the decoder must receive a matching modified message signal in order to disconnect the protection device. The transmitter itself can be reprogrammed by manually pressing a button thereon to transmit such a modified message signal. In the semiautomatic embodiment the transmitter must be within said range of the receiver and must be reprogrammed to generate a modified message signal before the transmitter can disconnect the device.
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