A star-shaped physical distribution CAN bus device with bus topology

Abstract

The invention provides star physical distribution CAN (Controller Area Network) bus equipment with a daisy-chain topology structure. The star physical distribution CAN bus equipment comprises exchange point equipment, a peripheral and a cable, and is characterized in that the exchange point equipment is provided with a plurality of CAN bus interfaces; two points are selected on a socket of each CAN bus interface and a corresponding plug; two points of the same plug are connected through the cable, and are connected with the peripheral; and the two points of the same socket are respectively connected with one point of an adjacent socket through cables. The invention is applied to the CAN bus equipment which cannot be connected to form a bus form due to space limitation, and the CAN bus equipment bus type topology structure and hot plug design of the equipment are realized through a star physical connection manner.

Description

technical field [0001] The invention belongs to the technical field of electronic information and relates to a CAN bus device. Background technique [0002] CAN (Controller area Network) bus has been widely used in my country's aviation and other fields because of its good environmental adaptability and high reliability. In recent years, it has been used more and more in aerospace fields such as small satellites and Shenzhou spacecraft. According to the regulations in ISO / CD 11898 (Road Vehicles-Controller area Network), the CAN bus has two topologies: bus topology and hub-spoken topology. Specific as figure 1 and figure 2 shown. ISO / CD 11898 imposes strict constraints on the star topology, as follows: [0003] 1) Each peripheral can be connected to a star switching point, but the star switching points must be connected through a bus topology; [0004] 2) The shorter the length of the connection from the peripheral to the star switching point, the better; [0005] 3)...

AI Technical Summary

Problems solved by technology

[0009] However, in some special environments, limited by the size of the space and application requirements, the CAN bus peripherals are physically distributed in a star shape, and the devices on the bus need to be hot-swapped.

At this time, the bus topology cannot be realized according to the traditional connection method, and the star topology will bring a certain degree of application risk to the system

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