Deferred acknowledgment communications and alarm management
2 Assignments
0 Petitions
Accused Products
Abstract
A communication technique enables the efficient transmission of data through a low bandwidth and/or time delayed communication link and minimizes the idle time of the communication link by using a deferred acknowledgment of message bundles to temporally pack the communication link. The transmitting system stores messages to be transmitted in a pending message queue and applies a dynamic window to the pending message queue to define a message bundle to be sent through the slow communication link. The transmitting system requests an acknowledgment for at least one message within the bundle, but does not require an acknowledgment for every message within the bundle. Transmitted messages are temporarily stored as outstanding messages in a retransmission queue until the transmitted messages are acknowledged or until a time-out period associated with the messages has lapsed. When the transmitting station receives a timely acknowledgment in response to a requested acknowledgment, the transmitting station removes all outstanding messages associated with that acknowledgment from the retransmission queue.
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Citations
80 Claims
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1-71. -71. (cancelled)
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72. A method of communicating application information in a process control system having a first portion that is communicatively coupled to a second portion via a communication link, the method comprising the steps of:
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establishing an application client process within the first portion of the process control system;
establishing an application server process within the second portion of the process control system;
sending a first application message from the application server process to the application client process defining a set of application information to be sent periodically to the client process; and
sending periodic application update messages from the application server process to the client process, wherein the update messages include information pertaining to the set of application information specified by the first application message. - View Dependent Claims (73, 74, 75, 76, 77, 78, 79, 80)
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Specification