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Techniques for Interbus Communication in a Multibus Avionic System,
BRITISH AEROSPACE AIRCRAFT GROUP BROUGH (ENGLAND) KINGSTON-BROUGH DIV
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While studying the design of Total Aircraft Systems using MIL-STD-1553 Data Buses the need for interbus communication protocols in multibus architectures was established. Two types of interbus communication were identified as necessary Cyclic message transfers and Acyclic message transfers. Cyclic messages are handled by assigning specific subaddresses in the Bus Controller Remote Terminals which receive and pass on these messages to the appropriate destination on a cyclic basis as preprogrammed in the relevant Bus Controllers. Acyclic messages are handled by a special protocol based on the use of the Service Request Bit in the status word, the Transmit Vector Word Mode Code, a specially formulated Vector Word, special Data Words which are used an Interbus Transmit and Interbus Receive Command Words, together with the use of reserved subaddresses, one for each bus on the network. This protocol is explained in detail together with the measures taken in the Subsystem to Remote Terminal Interface to ensure orderly transmission of data and effective error recovery with lost or corrupt messages. Author
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