Abstract
On the adaptation of CAN BUS network for use in the ship electronic systems This paper presents an analysis of application of the CAN - based marine electronics standard NMEA 2000, recently developed one, on board sea-going vessels, especially in the context of small, recreational, sailing and motor craft. The idea and development of the system has been briefly presented. The properties of the CAN network has been described and the use of its functions by the NMEA system, discussed. The discussion has been performed for all layers of the communication protocol, according to the Open Systems Interconnection Reference Model worked out by ISO. All the features have been summarized and analyzed in the context of their possible use in various shipboard systems.
Highlights
In the beginning phase of ship electronics development, each device was an entirely independent unit. Devices such as electronic log, echo sounder or gyrocompass were carrying out their own tasks, being not connected to other instruments
The NMEA0183 standard introduced in 1983 incorporated radical changes in the system which enabled the mutual communication between virtually each device of a vessel’s electronics, and easy exchange of data with PC computer
The progressing strong integration of the on-board systems results in that the modern maritime electronic equipment requires data coming from many sources
Summary
In the beginning phase of ship electronics development, each device was an entirely independent unit. In the data connection layer of the NMEA 2000 network, main functions of the CAN interface are: generating the linear stream of bits, controlling the access to the network as well as controlling errors and automatic transmission of messages in which the errors occurred. The NMEA 2000 standard fully makes use of the described functionality of the CAN network, and in the same time the main tasks it imposes on it in the data connection layer, are the following: ensuring the method of transmitting the data which are too big to be contained in a single 8-bit data frame defining the set of messages in order to issue a command to the network devices (for example: at the data request or the confirmation request). Thanks to the use of CAN protocol, the presented system makes it possible to apply the technology of the most exclusive glass-cockpit solutions, with just a fraction of its traditional cost
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