| 摘要 |
Devices for the remote transmission of controls in security constituted by a remote control device comprising a microprocessor equipped with EPROM and programmed in such a way to be suitable to code the output messages according to a fixed base code and a dynamic code, determined for any message performing a predetermined algorithm on the dinamic code employed in the previous transmitted message, and by a receiver connected to the means to control, comprising a microprocessor equipped with an EPROM and programmed in such a way to be suitable to check the code of the received messages on the ground of the same fixed base code of the remote control device and of the dynamic code, which it determines automatically performing the same algorithm of the remote control device on the stored dynamic code of the previous received message, and to transmit a control signal of the means to control after the positive comparison of the two codes of the input message with the base code and the new dynamic code, calculated by itself, taken toghether, being the base codes and part of the instructions for performing the algorithm, as the other instructions are comprised in the program, storable upon assembling of the devices in the EPROMs while the dynamic codes are stored and erased progressively during the various operations of the devices. |
