Communications: electrical – Selective – Interrogation response
Patent
1994-06-13
2000-10-10
Zimmerman, Brian
Communications: electrical
Selective
Interrogation response
455343, H04Q 100
Patent
active
061306037
ABSTRACT:
An electronic price display system uses an RF communications channel between a central computer and a multiplicity of electronic price display labels. Each label is powered by a voltaic cell ("battery") such as a lithium cell. The receiver-on time, which in other RF-linked systems contributes heavily to the overall battery drain, here does not contribute appreciably to battery drain because a passive RF transceiver is used to receive and address-decode the address portion of received packets. Upon an address match, the passive RF transceiver generates an interrupt to the controller of the display label, and the interrupt prompts the controller to go to a higher-power-drain state to process the received data. If the received command requires a response, the controller of the label generates a response which is transmitted via RF from the label back to the central computer.
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ERS International, Inc.
Zimmerman Brian
LandOfFree
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