Method and apparatus for monitoring and switching over to a back

Details Method and apparatus for monitoring and switching over to a back Method and apparatus for monitoring and switching over to a back

1993-03-10

1995-04-04

Harvey, Jack B.

Excavating

371 81, 371 201, 371 681, 364DIG1, 3642304, 364240, 3642402, 3642407, G06F 1300, G06F 1100

Patent

active

054044650

ABSTRACT:
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.

REFERENCES:
patent: 4245344 (1981-01-01), Richtey
patent: 4527271 (1985-07-01), Haller
patent: 4912633 (1990-05-01), Schweizer et al.
patent: 4967344 (1990-10-01), Scavezze
patent: 5086499 (1992-02-01), Mutone
patent: 5210756 (1993-05-01), Kummer et al.
patent: 5247522 (1993-09-01), Reiff
ISO 4335, Third Edition, "Information Processing Systems Data Communication--High-Level Data Link Control Elements of Procedures," International Organization for Standarization, Jan. 8, 1987.
Draft DIN 43322 German Standard specification, Parts 1, 2, 4 and 5 dated Jun. 1988 and Part 3 dated Jul. 1988, Parts 1-5 in English and Part 3 in German also.

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