David Justin Holmes

US Patent:

20100077111, Mar 25, 2010

Filed:

Sep 23, 2008

Appl. No.:

12/236165

Inventors:

David Holmes - Georgetown TX, US
Gary Keith Law - Georgetown TX, US

International Classification:

G06F 13/00

US Classification:

710 33

Abstract:

Example apparatus and methods to communicatively couple field devices to controllers in a process control system are disclosed. An example method of changing a communication protocol of a first field device in a process control system includes decoupling from the first field device a first removable communication module configured to communicate using a first communication protocol. The example method also includes coupling to the first field device a second removable communication module configured to communicate using a second communication protocol. After coupling the second removable communication module, the first field device is configured to communicate using the second communication protocol. In addition, the first field device is coupled to a first communication channel on an input/output card when communicating using the first communication protocol and the first field device is coupled to the first communication channel on the input/output card when communicating using the second communication protocol.

US Patent:

57607311, Jun 2, 1998

Filed:

Dec 19, 1995

Appl. No.:

8/574617

Inventors:

David W. Holmes - Georgetown TX

Assignee:

Fisher Controls International, Inc. - Clayton MO

International Classification:

G01S 1300

US Classification:

342118

Abstract:

A sensor for sensing a displacement in a mechanical system using radar utilizes a miniaturized radar transceiver formed, typically, on a silicon chip. The transceiver is mounted to a fixed surface that senses a displacement of a moving surface. The moving surface is typically located in mechanical communication with a system to be sensed. By using appropriate translating circuitry, an accurate determination of the nature of displacement of the mechanical system can be made. Mechanical systems sensed can include rotating and sliding components such as motors, valves and pressure gauges. Sensors according to this invention are highly accurate and reliable.