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What are the differences between the CAN 2.0A and CAN 2.0B specifications of the CAN protocol?

April 26, 2017Engineering NetworkingEngineering networking

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Ali Khakpour Posted

What are the differences between the CAN 2.0A and CAN 2.0B specifications of the CAN protocol?

1 Answer

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shivam dixit Posted

hi

Version 1.0 and 1.2 defined CAN with an 11-bit message identification giving a possible 2048 message identifiers. Version 2.0 has allowed an 18-bit message ID extension allowing for an effective 29-bit message ID. To keep new CAN devices compatible with older implementations, the CAN 2.0 specification is defined in two parts, 2.0A and 2.0B. In CAN 2.0A, the message format is consistent with older versions of CAN that use only an 11-bit message ID. In CAN 2.0B the 18-bit message ID extension is allowed. CAN 2.0B can then be implemented in either the passive or active mode.
CAN version 1.0, 1.2 and 2.0A are called “standard CAN” because they all use an 11-bit message ID. CAN 2.0 B is called “Extended CAN” as it uses the extended 29-bit message ID.