Initial Considerations

PHYTEC America




Initial considerations for *CAN Technology:

(*Control Area Networking)

Dave Funk - Consultant – PHYTEC- 06/17/1999

Like many things in the technology spectrum, CAN is an open technology that can be best thought of as the usual combination of (1) hardware devices, (2) interfacing methods, and (3) software control, for advanced serial communications. By placing an initial emphasis on the interface, as a mental pivot point, the other two considerations become easier to relate to, and to deal with their complexities. For those who are familiar with the standard 7-layer ISO/OSI model for Networking, the CAN Network is based on the same principle from the Applications Layer down to the Hardware Layer. It would also be well to remember that the difference between passive and intelligent systems, is that intelligent systems are "hardware controlled by software".

The two CAN protocol versions are "Standard" (11-bit ID) and "Extended" (29-bit ID).


These termination resistors are necessary to reduce noise and echoing of signals on the data-bus, where it would impact the reliability of data messaging between devices on the bus.



The higher-priority devices arbitrate at the earlier part of the ID, thereby allowing those devices to assume their proper role for messaging.



The complexity of the CAN Network technology is not in the voltage levels, but in the considerable optimization of the Collision-Detection, Messaging Protocols, and the "Multiple-Master" capability of the CAN Network.



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