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COMMUNICATIONS PROTOCOLS IN AERONAUTICS

by George Novacek

Start ý Data Bus Systems ý Timing is the Secret ý ARINC 429 ý CSDB and ASCB ý MIL-STD-1553B ý ARINC 629 and Beyond ý ARINC 429 Implementation ý Data Format ý Wrap Up ý Sources and PDF

CSDB AND ASCB

The CSDB by Collins and the ASCB by Honeywell are proprietary protocols. They are most often found in smaller business and private general aviation (GA) aircraft. Collins and Honeywell are two major suppliers of cockpit electronic suites, and their respective protocols were developed with the primary intent of interfacing their components in mind.

Like ARINC 429, CSDB is a unidirectional data bus that can also be run both slow and fast. The slow mode is 12.5 kbps and the fast mode is 50 kbps. Up to 10 receivers can be connected to one transmitter. Honeywellýs ASCB, on the other hand, is a centrally controlled, bidirectional bus. The basic configuration is comprised of a BC running two isolated buses, which allows for separation of critical and noncritical subsystems. Each bus can support up to 48 individual members.

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