Remote control security system

Abstract

A remote control keyless security system for remotely controlling the locking and unlocking control functions of a lock mounted on a vehicle or the like. A receiver is mounted on a vehicle proximate to the lock to be controlled. A transmitter is located remote from the receiver and includes a plurality of selectively actuatable switches each representative of a control function to be performed by the lock and circuitry responsive to actuation of one of the switches for transmitting a digital signal including a first portion having a multi-bit security code uniquely identifying the transmitter from that of a plurality of similar transmitters, a multi-bit sequence control code adapted to be sequentially changed in response to each actuation of a switch and a multi-bit function code identifying one of a plurality of control functions to be performed by the lock. The transmitter changes the sequence control code after each operation with the change being dependent upon information contained in the security code identifying the transmitter. The receiver stores a multi-bit receiver security code identifying a specific transmitter from which the receiver may validly receive a digital signal. The received security code is compared with the stored receiver security code to determine whether the security codes match. The receiver also stores a multi-bit sequence control code.