| 摘要 |
An add-on apparatus is provided for allowing pre-installed access control systems to act as asset management systems. This apparatus can make use of existing access control panels, networks, and sometimes access control system readers and other infrastructure. The readers receive periodic signals from active tags associated with particular assets. When an asset moves to a new location, the associated active tag emits a signal (one of the continual stream of periodic signals that it emits). That signal is detected by a nearby reader for the first time. The reader transmits information derived from the signal to the apparatus, which then changes state to indicate that the asset is now in its domain. This information is repackaged and sent to another component of the access/asset management system for appropriate action. Note that the apparatus continues to receive signals generated from the active tag while the asset is in close proximity to the reader. However, the apparatus does not transmit this information to other components of the system. The apparatus changes state once while the asset is under its jurisdiction. When it undergoes that state change, the apparatus sends an initial message to the access/asset management system. Thereafter it sends no updated message until the asset moves out of reach of its reader. Asset movement may be detected by a cessation of signals detected by the reader or by receipt of a new signal from a different reader (located at a door for example).
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