Access control using serial discretely coded RF transmissions in

Communications: electrical – Continuously variable indicating – With meter reading

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34082534, 327261, 327276, 455126, G06F 704

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active

059261064

ABSTRACT:
Apparatus and methods for entryway access control using serial discretely coded radio frequency transmissions initiated by a single user access request signal. The control apparatus is battery operated and includes a user actuatable input selectively generating a single electrical initiation signal. Circuitry provides first and second conditioned output signals responsive to receipt of the single electrical initiation signal, the output signals enabling first and second transmission channels, respectively, of an RF transmitter or transmitters. A signal delaying circuit delays output of the second conditioned output signal relative to output of the first conditioned output signal.

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patent: 5751224 (1998-05-01), Fitzgibbon
"Multi-Code" Installation Instructions; Stanley Electronics; Date of Original Publication Unknown. (no month, no date).

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