SAE SAE J2284-1 Issued MAR2002
-4-
2.2 Related Publications—The following publications are for information purposes only and are not a required
part of this specification.
2.2.1 SAE PUBLICATIONS—Available from SAE, 400 Commonwealth Drive, Warrendale, Pa. 15096-0001
SAE J1930—Electrical/Electronic Systems Diagnostic Terms, Definitions, Abbreviations and Acronyms
SAE J2190—Enhanced Diagnostic Test Modes
SAE 970295—CAN Bit Timing Requirements
2.2.2 ISO P UBLICATIONS—Available from ANSI, 25 West 43rd Street, New York, NY 10036-8002.
ISO 7498—Data processing systems, Open systems interconnection standard reference manual
ISO 7637/1—Road vehicles, Electrical disturbance by conduction and coupling
ISO 14229—Road vehicles, Diagnostic systems, Specification of diagnostic services
2.2.3 OTHER PUBLICATIONS
CISPR 25 - Limits & Methods of Measurement of Radio Disturbance Characteristics for the Protection of
Receivers Used On-Board Vehicles
3. Definitions—The definitions provided in SAE J1213-1 apply to this document. Additional or modified
definitions, acronyms, and abbreviations included in this document or relevant to the communication of
information in a vehicle are catalogued in this section.
3.1 CAN_H—The CAN_H bus wire is fixed to a mean voltage level during the recessive state and is driven in a
positive voltage direction during the dominant bit state.
3.2 CAN_L—The CAN_L bus wire is fixed to a mean voltage level during the recessive state and is driven in a
negative voltage direction during the dominant bit state.
3.3 Data Link Layer—Provides the reliable transfer of information across the Physical Layer. This includes
message qualification and error control.
3.4 Data Link Connector (DLC)—Provides the electrical connection between Off-Board and On-Board ECUs. For
some vehicles, the DLC is the SAE J1962 connector.
3.5 Dominant State—The dominant state is represented by a differential voltage greater than a minimum
threshold between the CAN_L and CAN_H bus wires. The dominant state overwrites the recessive state and
represents a logic “0” bit value.
3.6 Electronic Control Unit (ECU)—A On- or Off-vehicle electronic assembly from which CAN SAE J2284-1
messages may be sent and/or received.
3.7 Media—The physical entity which conveys the electrical (or equivalent means of communication) transmission
between ECUs on the network. (e.g., unshielded twisted pair wires)
3.8 Physical Layer—Concerns the transmission of an unstructured bit stream over physical media: deals with the
mechanical, electrical, functional and procedural characteristics to access the physical media.
3.9 Protocol—Formal set of conventions or rules for the exchange of information between ECUs. This includes the
specification of frame administration, frame transfer and physical layer.
3.10 Radiated Emissions—Radiated Emissions consists of energy that emanate from the CAN bus wires. Electric
field strength in dbmV/m is the typical measure of radiated emissions.