Networking and Telecommunication: CAN protocol

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CAN originally developed for the automotive industry is an International Standardization Organization (ISO) defined serial bus standard to replace the complex wiring with a two-wire bus. The specification signifies the high immunity to electrical interference. The ability to self diagnose and repair data errors make it significant. The CAN communication protocol is based on carrier-sense, multiple-access protocol using collision detection and arbitration on message priority (CSMA/CD+AMP). Normally, a logic-high is associated with a one, and a logic-low is associated with a zero – however not so on a CAN bus. A node continues upon the message, without the message getting destroyed or corrupted by another node. The allocation of priority to messages within the identifier is a feature of CAN that makes it significantly attractive for use within a real-time environment. The higher is its priority, if the binary message identifier number is low. The data link and physical signaling layers, which are normally transparent to a system operator, are enclosed in any controller that implements the CAN protocol. Signaling is differential which is where CAN derives its robust noise immunity and fault tolerance. The MCU and bus connectors need solely two pins. Therefore, a CAN network is more reliable and acceptable than other networking schemes that need more wires and connections. CAN is based on a “multiple master, multiple slave” message broadcast topology. Message or information Frames transmitted do not contain the addresses of either the transmitting node or of any intended receiving node. It implies that any node can act as master or slave at any instant of time. Messages can be sent between nodes or can be broadcasted, depending on wh... ... middle of paper ... ... 11, pp. 1589–1595, Nov. 2009 [4] D. G. Senesky, B. Jamshidi, K. Cheng, and A. P. Pisano, “Harsh environment silicon carbide sensors for health and performance monitoring of aerospace systems: A review,” IEEE Sensors J., Vol. 9, no. 11, pp. 1472–1478, Nov. 2009 [5] M. J. Whelan, M. V. Gangone, and K. D. Janoyan, “Highway bridge assessment using an adaptive real-time wireless sensor network,” IEEE Sensors J., Vol. 9, no. 11, pp. 1405–1413, Nov. 2009 [6] K. Sampigethaya, R. Poovendran, L. Bushnell, M. Li, R. Robinson, and S. Lintelman, “Secure wireless collection and distribution of commercial airplane health data,” IEEE Aerosp. Electron. Syst. Mag., Vol. 24, no. 7, pp. 14–20, Jul. 2009 [7] Steve Corrigan, “Introduction to the Controller Area Network”, Published by Texas Instruments Application Report,SLOA101A, August 2002–Revised July 2008

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