Importance

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Abstract

A point to multipoint has a single transmission device and multiple remotely located receivers. Each remote receiver receives a transmitted signal via a satellite and extracts information in the form of data bytes. A microprocessor assemblies and interprets the data bytes according to a predefined protocol and then executes the desired action by affecting an appropriate device. The protocol enables the transmitter to direct commands to some sets of remote receivers other than all of the remote receivers and can switch channels and frequency at will to improve flexibility and security. The protocol defines a special way of packeting asychronously encoded bytes of data so that common software in remote receiving units may detect packet boundaries, detect one or two bit errors in a packet and correct single bit errors. The common software may also determine if a packet is targeted or addressed to the remote and may parse and execute the implied command of the packet. The length of a packet frame varies from a minimum of seventeen bytes to a practical maximum of two hundred fifty bytes. There are nine data fields in each frame that contain identification, data and command istructions.

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First Claim