08049361 is referenced by 4 patents and cites 306 patents.

A wireless adapter for use with a two-wire process control loop is configured to couple to a process field device in an industrial process control system. The wireless adapter is coupled to the two-wire process control loop and provides wireless communication to the process field device. The adapter includes first and second loop terminals configured to couple in series with the two-wire process control loop. Wireless communication circuitry is coupled to the first and second loop terminals and is adapted to provide wireless communication to the process field device. Loop current bypass circuitry is electrically connected between the first and second loop terminals and is configured to provide a loop current path therebetween in response to an open circuit in wireless communication circuitry.

Title
RF adapter for field device with loop current bypass
Application Number
12/486253
Publication Number
8049361 (B2)
Application Date
June 17, 2009
Publication Date
November 1, 2011
Inventor
Brian L Westfield
Victoria
MN, US
John A Kielb
Eden Prairie
MN, US
Agent
Westman Champlin & Kelly P A
Assignee
Rosemount
MN, US
IPC
H02J 3/00
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