Redundant radio frequency network having a roaming terminal communication protocol

  • US 6,714,559 B1
  • Filed: 09/21/2001
  • Issued: 03/30/2004
  • Est. Priority Date: 12/04/1991
  • Status: Expired due to Fees
First Claim
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1. A method of beginning a data exchange over an RF communication link between a polling device and a sending device wherein the polling device has an interpoll gap time, the method comprising:

  • (a) identifying by the sending device that the RF communication link is clear throughout a period which is at least as long as the maximum possible interpoll gap time under conditions solely when the RF communication link is heavily loaded; and

    (b) transmitting a request for poll frame by the sending device.

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