System for establishing a code and controlling operation of equipment

A system for establishing codes and controlling operation of at least two pieces of equipment, such as a garage door operating mechanism and a security device, by transmitting radio frequency signals carrying said codes, said system comprising:

• a first transceiver;
• a second transceiver substantially identical to said first transceiver, each said transceiver comprising:
• means for randomly generating codes,
• means for receiving a radio frequency signal carrying a code,
• memory means having a first location for storage of a first code and a second location for storage of a second code,
• means for selecting one of said locations for storage of a code,
• means for selecting whether the code is to be stored in the selected location is a code from said means for randomly generating codes or is a code from said means for receiving, the last-mentioned means for selecting including means for disabling said means for randomly generating codes in response to reception of a radio frequency signal carrying a code, and
• means for transmitting a radio frequency signal carrying the first code and for transmitting a radio frequency signal carrying the second code, said system further comprising:
• a first receiver for positioning remote from said transceivers and for connection to one of said pieces of equipment which is a garage door operating mechanism;
• and
• a second receiver for positioning remote from said transceivers and for connection to the other of said pieces of equipment, each said receiver comprising:
• means for receiving radio frequency signals transmitted by said transceivers,
• memory means storing the code of only one memory location of said first transceiver, the memory means of the other receiver storing the code of the other memory location of said first transceiver,
• means for comparing a code carried by a radio frequency signal with the code stored in the last-mentioned memory means, and
• means responsive to the means for comparing to cause actuation of the corresponding piece of equipment whereby the codes of the memory locations of the transceivers can be identical with either transceiver establishing the codes, either transceiver can actuate either piece of equipment, and in the event of loss of the first transceiver, the second transceiver can be used to program into the memory locations of a third transceiver the codes randomly generated by the first transceiver so that there is no need to change the codes stored in the memories of the receivers.