Importance

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Abstract

The present invention is a communications system comprising a host device and an external device or product having a 4 byte Product ID. The host device is adapted to poll the external device to determine the Product ID of the external device. The external device is adapted to transmit its 4 byte Product ID to the host device in response to the Product ID Request from the host device. The host device is adapted to generate a packet having an authentication command 0.times.1 F followed by a pair of CRC bytes having a CRC_HI byte and a CRC LO byte. The pair of CRC bytes take into account the 4 byte Product ID and the authentication command 0.times.1 F when generating an overall value. The 4 byte Product ID is not contained in the packet. The host device 12 is further adapted to transmit the packet to the external device 14. The external device is further adapted to authenticate the packet, and if authenticated, provide the host device with full command and control of the external device 14. When authenticating, the external device knows and includes the fact that the value generated by the pair of CRC bytes has taken into consideration the value represented by the 4 byte Product ID.

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First Claim