| 摘要 |
<p>A communication system (10) including a transmitting unit (13) and a receiving unit (14), the transmitting unit (13) having a keypad (16) and a signal generator (21) which generates signals for transmission as a coded message in accordance with actuation of particular keys (17) of the keypad (16). The receiving unit (14) includes a memory which stores a coded message and a comparator which compares the transmitted message with the stored message so that an output from the receiving unit (14) is generated when the stored message compares correctly with the transmitted message. In a second mode of the receiving unit (14), the memory can be reprogrammed with the message transmitted by the transmitting unit so that the transmitted message required to generate the receiving unit output can be varied. The output of the receiving unit (14) can be used to actuate a solenoid of a lock (11) or any other device.</p> |
