Boots – shoes – and leggings
Patent
1990-09-26
1992-08-25
Smith, Jerry
Boots, shoes, and leggings
364187, 364132, G06F 1120, G06F 1546
Patent
active
051424703
ABSTRACT:
Data bases of a first and second input output processor (IOP), which are primary and secondary slave IOPs, respectively, are sychronized, and communications by a master controller is made only to the first IOP. Each IOP is executing the same tasks utilizing their own clocking systems. A method for maintaining synchronization between the first and second IOP comprises the steps of transmitting a message addressed to the first IOP by the master controller. The first IOP receives the message for subsequent execution. Receipt of the message is acknowledged by a transmission back to the master controller the acknowledge message including a message number. The second IOP eavesdrops on the transmissions between the master controller and any of the IOPs on the network. Upon recognizing that the message is addressed to the corresponding first IOP and that the message is of a predetermined type, the second IOP receives the message for subsequent execution. The second IOP verifies the message number in the acknowledge message, the message number being determinable by the second IOP, such that when both the first and second IOP complete execution of the received message which results in an update of the respective data bases, both data bases continue to contain the same information thereby maintaining synchronization.
REFERENCES:
patent: 4141066 (1979-02-01), Keiles
patent: 4607256 (1986-08-01), Henzel
patent: 4958270 (1990-09-01), McLaughlin et al.
patent: 4959768 (1990-09-01), Gerhart
patent: 5008805 (1991-04-01), Fiebig et al.
patent: 5088021 (1992-02-01), McLaughlin et al.
Bristow Robert W.
McLaughlin Paul F.
Gordon Paul
Honeywell Inc.
Lenkszus D.
Sapelli A. A.
Smith Jerry
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