Reconfigurable universal trainable transmitter

DETAILED DESCRIPTION The present invention provides a re-configurable trainable transmitter including a removable plug-in data module which contains a cryptographic algorithm and the other information necessary for generating a wireless signal containing a code associated with a specific security system.
The trainable transmitter generally comprises a transmitter and code-generation circuitry, such as a microprocessor.
The microprocessor generates a digital code based upon the data in the data module, including the cryptographic algorithm.
The microprocessor determines a digital code based upon the cryptographic algorithm and the transmitter generates a wireless signal including the digital code at a frequency also specified by the data module.
Preferably, the data module is associated with a security system from a certain manufacturer or of a specified model or models.
Initially, a user would obtain the correct data module necessary to operate the user's security system, such as garage door opener or home security system, either from the manufacturer of the security system or the manufacturer of the vehicle.
By providing the correct plug-in data module, no learning mode would be required.
Further, it would not be necessary to store the cryptographic algorithms from the many manufacturers on the trainable transmitter.
Only the cryptographic algorithm to be used would be stored on the trainable transmitter.