Source: http://www.google.com/patents/US5404465?ie=ISO-8859-1&dq=5,758,352
Timestamp: 2014-10-25 23:36:09
Document Index: 382430595

Matched Legal Cases: ['arts 1', 'art 3', 'arts 1', 'art 3', 'arts 1', 'art 3', 'arts 1', 'art 3']

Patent US5404465 - Method and apparatus for monitoring and switching over to a back-up bus in a ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsA method A and apparatus for monitoring and switching over from a primary bus to a back-up bus in a network having a master node and at least one slave node, the primary bus and the back-up bus each interconnecting the master node and the at least one slave node. The method includes periodically sending...http://www.google.com/patents/US5404465?utm_source=gb-gplus-sharePatent US5404465 - Method and apparatus for monitoring and switching over to a back-up bus in a redundant trainline monitor systemAdvanced Patent SearchPublication numberUS5404465 APublication typeGrantApplication numberUS 08/029,348Publication dateApr 4, 1995Filing dateMar 10, 1993Priority dateMar 18, 1992Fee statusLapsedPublication number029348, 08029348, US 5404465 A, US 5404465A, US-A-5404465, US5404465 A, US5404465AInventorsMichael R. Novakovich, Joseph S. MajewskiOriginal AssigneeAeg Transportation Systems, Inc.Export CitationBiBTeX, EndNote, RefManPatent Citations (7), Non-Patent Citations (4), Referenced by (24), Classifications (11), Legal Events (4) External Links: USPTO, USPTO Assignment, EspacenetMethod and apparatus for monitoring and switching over to a back-up bus in a redundant trainline monitor systemUS 5404465 AAbstract A method A and apparatus for monitoring and switching over from a primary bus to a back-up bus in a network having a master node and at least one slave node, the primary bus and the back-up bus each interconnecting the master node and the at least one slave node. The method includes periodically sending via the back-up bus from the master node to each of the slave nodes a master test packet containing a master address of the master node on the back-up bus and sending on the back-up bus from the at least one slave node to the master node and in response to receiving the master test packet, a slave test packet containing a slave address of the at least one slave node on the back-up bus. The method further includes indicating failures on the primary and back-up bus and disconnecting the primary bus from the master node and the at least one slave node and resuming communications between the master node and the at least one slave node via the back-up bus when a failure occurs on the primary bus and no failures occur on the back-up bus.
What is claimed is: 1. A method for monitoring and switching over from a primary train bus to a back-up train bus in a serial communications network having a master node and at least one slave node, the primary train bus and the back-up train bus each serially interconnecting the master node and the at least one slave node, the master node and the at least one slave node having respective addresses on the primary train bus and the backup train bus, addresses of slave nodes on the primary train bus and the backup train bus being accessible to the master node, the method comprising the steps of:communicating over the primary train bus; indicating during communication over the primary train bus an occurrence of a failure on the primary train bus; periodically sending on the back-up train bus from the master node to each of the slave nodes, a master test packet containing the address of the master node on the back-up train bus; sending on the back-up train bus from the at least one slave node to the master node and in response to receiving the master test packet, a slave test packet containing the address of the at least one slave node on the back-up train bus; indicating an occurrence of a failure of communication on the back-up train bus between the master node and the at least one slave node when no slave test packet is received by the master node via the back-up train bus, or when the slave test packet received via the back-up train bus contains an incorrect address of the at least one slave node on the back-up train bus, otherwise indicating occurrence of no failures on the back-up train bus; and disconnecting the primary train bus from the master node and the at least one slave node and thereafter communicating between the master node and the at least one slave node via the back-up train bus when said indicating steps determine an occurrence of a failure on the primary train bus and no failures on the back-up train bus. 2. The method as claimed in claim 1, wherein the serial communications network operates with bus cycles, and wherein said step of periodically sending on the back-up train bus comprises sending during every bus cycle on the back-up train bus, from the master node to each of the slave nodes, a master test packet containing an address of the master node on the back-up train bus.
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microcontrollersCN101330421BMay 23, 2008May 18, 2011株式会社东芝Transmission system for rail vehiclesEP1067036A1 *Jul 6, 2000Jan 10, 2001DaimlerChrysler AGCommunication and control system for railbound vehiclesEP1995148A1 *May 23, 2008Nov 26, 2008Kabushiki Kaisha ToshibaTransmission system for rail vehicles using two redundant bus systemsWO2004004180A1 *Jun 27, 2003Jan 8, 2004Harris CorpSoftware fault tolerance between nodesWO2010016985A1 *Jul 2, 2009Feb 11, 2010General Electric CompanySystem, method, and computer software code for providing an auxiliary communication path when a primary communication path is unavailable* Cited by examinerClassifications U.S. Classification710/110, 714/43, 714/712, 714/4.11International ClassificationG06F11/20Cooperative ClassificationH04L12/40189, B61L15/0063, G06F11/2007, H04L2012/40293European ClassificationG06F11/20C4, B61L15/00ELegal EventsDateCodeEventDescriptionJun 15, 1999FPExpired due to failure to pay maintenance feeEffective date: 19990404Apr 4, 1999LAPSLapse for failure to pay maintenance feesOct 27, 1998REMIMaintenance fee reminder mailedApr 22, 1996ASAssignmentOwner name: ABB DAIMLER-BENZ TRANSPORTATION (NORTH AMERICA) INFree format text: CHANGE OF NAME;ASSIGNOR:AEG TRANSPORATION SYSTEMS, INC.;REEL/FRAME:007894/0959Effective date: 19960102RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services©2012 Google