| 摘要 |
A management system for tracking elements through steps and stages of a chain employing fixed tags permanently attached to elements that progress through the steps and stages. The elements are tracked by the fixed tags from an initial stage, through multiple work-in-process stages to a final stage of the chain. The fixed tags include radio-frequency (RF) communication units that have wireless communication with RF communicators in one or more of the stages of the supply chain. The wireless communications between the RF tags and the RF communicators operate with a tag communication protocol that defines the operations and sequences for storing information into and retrieval of information from tags. The hierarchy of data storage in RF tags, in RF communicators and otherwise in storage locations in the system is controlled to operate within the memory hierarchy.
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