Technical Paper
A Gateway for CAN Specification 2.0 Non-Passive Devices
1993-03-01
930005
The Controller Area Network (CAN) protocol, developed by ROBERT BOSCH GmbH, offers a comprehensive solution to managing communication between multiple CPUs. In September 1991, the CAN protocol was revised (CAN Specification 2.0) to add an extended message format that increases the number of permitted message identifiers. The CAN protocol now supports 11- and 29-bit message identifiers allowing standard and extended formats, respectively. CAN Specification 2.0 implements a new message bit, the identifier extension bit (IDE bit) which allows CAN devices to differentiate standard and extended formats. However, most existing CAN implementations are based on the previous CAN protocol specification and will not recognize extended format messages and will respond with an error message. These chips are CAN Specification 2.0 non-passive.
