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Dual protocol handheld field maintenance tool with radio-frequency communication

  • US 7,426,452 B2
  • Filed: 11/08/2005
  • Issued: 09/16/2008
  • Est. Priority Date: 12/06/2001
  • Status: Expired due to Term
First Claim
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1. A dual-protocol handheld field maintenance tool comprising:

  • terminals selectively coupling to a process communication loop having a communication protocol;

    first and second media access units coupled to the terminals, wherein the first media access unit is adapted to communicate in accordance with a first communication protocol, and wherein the second media access unit is adapted to communicate in accordance with a second protocol that is different than the first protocol;

    a processor coupled to the first and second media access units;

    a wireless transceiver coupled to the processor; and

    wherein at least one of the first and second communication protocols requires superimposing digital signals on a 4-20 mA analog signal.

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