Method of mapping refrigerated containers in a power line carrier based monitoring system
First Claim
1. A method of mapping addresses of a plurality of refrigerated containers having uniquely addressable remote monitoring units (RMUs) connected to a power line carrier based monitoring system which includes a master monitoring unit (MMU), wherein the MMU includes computer based means for mapping the RMUs with predetermined mapping commands, and the RMUs include computer based means for responding to the mapping commands, including means for generating a random number and means for preparing mapping response messages, comprising the steps of:
- mapping the RMUs of the refrigerated containers by the MMU with a predetermined first mapping command applied to the power line,responding to the first mapping command by the RMUs connected to the power line communication system,said mapping step including the steps of;
selecting a modulo having a range determined by the number of containers expected to be mapped,and inserting the selected modulo into the first mapping command,said responding step including the steps of;
generating a random number within the range of the modulo in the first mapping command,inserting the container'"'"'s address into a mapping response message,and applying the mapping response message to the power line at a time responsive to the magnitude of the random number.
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Abstract
A method of mapping addresses of a plurality of refrigerated containers having remote monitoring units (RMUs) connected to a power line carrier based monitoring system which includes a master monitoring unit (MMU). The method adapts to the size of the expected number of containers to be mapped by any mapping command, to reduce the overall time to map either a large or small number of containers. The method includes the MMU selecting a modulo having a magnitude determined by the number of containers expected to be mapped, and the RMUs generating a random number within the range responsive to the modulo. The RMUs apply response messages to the power line, which include the addresses of the associated containers, at a time responsive to the magnitude of the random number.
120 Citations
20 Claims
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1. A method of mapping addresses of a plurality of refrigerated containers having uniquely addressable remote monitoring units (RMUs) connected to a power line carrier based monitoring system which includes a master monitoring unit (MMU), wherein the MMU includes computer based means for mapping the RMUs with predetermined mapping commands, and the RMUs include computer based means for responding to the mapping commands, including means for generating a random number and means for preparing mapping response messages, comprising the steps of:
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mapping the RMUs of the refrigerated containers by the MMU with a predetermined first mapping command applied to the power line, responding to the first mapping command by the RMUs connected to the power line communication system, said mapping step including the steps of; selecting a modulo having a range determined by the number of containers expected to be mapped, and inserting the selected modulo into the first mapping command, said responding step including the steps of; generating a random number within the range of the modulo in the first mapping command, inserting the container'"'"'s address into a mapping response message, and applying the mapping response message to the power line at a time responsive to the magnitude of the random number. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification