General Requirements for the Trunk Serial Interface Communication Protocols

Abstract

The paper presents results of analyzing abnormal situations that appear in data transmission via the trunk serial interface during the flight design testing on a number of spacecraft developed at present, and proposes also general requirements for the interaction protocols. It shows that abnormal situations could be caused by the absence in the onboard computer systems of the following functions: setting the "Subscriber is busy" identifier, checking the command word for admissibility, working with the control commands "Transmit the response word", "Set the terminal device to the initial state", verifying checksums, collection and accumulation of the diagnostic data, and localizing the failure position. The paper considers failures arising in interaction of the onboard computing systems and the central onboard computer via the trunk serial interface, and describes their manifestations. It provides a list of messages of interaction via the trunk serial interface required in localizing and correcting a malfunction, as well as requirements for collection and accumulation of the diagnostic information, and interaction of the central onboard computer with the onboard computer systems of the onboard control system. The paper notes that during control at the onboard computing systems manufacturer, it is necessary to check at the threshold values stability of the signals and interaction of the onboard computer systems and the central onboard computer in the presence of the unfavorable factors (malfunctions and failures) arising in operation via the trunk serial interface

Please cite this article in English as:

Treshchetkin А.Yu., Gamzatov N.G., Nakhaev S.A., et al. General requirements for the trunk serial interface communication protocols. Herald of the Bauman Moscow State Technical University, Series Instrument Engineering, 2025, no. 3 (152), pp. 49--63 (in Russ.). EDN: MYYPCS

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