The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 11, 2006
Filed:
May. 16, 2003
Moises A. Delacruz, Cottage Grove, MN (US);
Daniel E. Vande Vusse, Savage, MN (US);
Kun Yang, Eden Prairie, MN (US);
Alan R. Dewey, Plymouth, MN (US);
Gregory J. Opheim, St. Paul, MN (US);
Moises A. DelaCruz, Cottage Grove, MN (US);
Daniel E. Vande Vusse, Savage, MN (US);
Kun Yang, Eden Prairie, MN (US);
Alan R. Dewey, Plymouth, MN (US);
Gregory J. Opheim, St. Paul, MN (US);
Fisher-Rosemount Systems, Inc., Austin, TX (US);
Abstract
A method for preventing unsafe transmission on an incompatible network with a multi-protocol intrinsically safe handheld field maintenance tool as provided. The method preferably includes checking voltage levels on two sets of network connections when a network connection is detected or indicated on one set. If incompatible voltage levels are detected, the field technician is warned. If voltage levels are appropriate on a selected set of network terminals, the method continues by listening for network traffic of the selected network type. In this manner, a multi-protocol intrinsically safe handheld field maintenance tool is operable with multiple process control communication protocols while minimizing the risk of incompatible data/signal transmission upon process communication loops.