ISO 15765-2:2024 PDF

Road vehicles — Diagnostic communication over Controller Area Network (DoCAN) — Part 2: Transport protocol and network layer services

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Title (English):

ISO 15765-2:2024

Road vehicles — Diagnostic communication over Controller Area Network (DoCAN) — Part 2: Transport protocol and network layer services

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 47
Publication date:: April 5, 2024
Edition:: ISO IS 15765 edition 4 version 1
ICS:: 43.040.15

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Description (English):

This document specifies a transport and network layer protocol with transport and network layer services tailored to meet the requirements of CAN-based vehicle network systems on controller area networks as specified in ISO 11898-1. The diagnostic communication over controller area network (DoCAN) protocol supports the standardized abstract service primitive interface as specified in ISO 14229-2 (UDS). This document supports different application layer protocols such as: — enhanced vehicle diagnostics (emissions-related system diagnostics beyond legislated functionality, non-emissions-related system diagnostics); — emissions-related on-board diagnostics (OBD) as specified in the ISO 15031 series and SAE J1979 series; — world-wide harmonized on-board diagnostics (WWH-OBD) as specified in the ISO 27145 series; and — end of life activation of on-board pyrotechnic devices (the ISO 26021 series). The transport protocol specifies an unconfirmed communication. NOTE This document does not determine whether CAN CC, CAN FD or both are recommended or required to be implemented by other standards referencing this document.

Technical details

Technical committee: ISO/TC 22/SC 31 - Data communication
SKU: ISO 15765-2:2024

Abstract

Overview

ISO 15765-2:2024 - Road vehicles - Diagnostic communication over Controller Area Network (DoCAN) - Part 2: Transport protocol and network layer services - defines the transport and network layer protocol and services for CAN-based vehicle networks (as per ISO 11898-1). The standard provides the DoCAN mechanisms used to carry diagnostic application messages (for example UDS) across Controller Area Network frames. The 2024 fourth edition updates and replaces the 2016 edition and clarifies mapping, timing and addressing behavior for modern CAN usage.

Key topics and technical requirements

Transport and network layer services: Defines abstract service primitives (T_Data) and how they map to lower-layer TL_Data, including parameter mapping and service data unit structure.
PDU types and protocol control information: Specifies Single Frame (SF), First Frame (FF), Consecutive Frame (CF) and Flow Control (FC) TL_PDU formats and TL_PCI fields used for segmented message transport.
Addressing formats: Covers normal, normal fixed, extended and mixed addressing for CAN identifiers and how address information (AI) is encoded in the NL_PDU.
Frame mapping and DLC handling: Describes mapping of transport/network attributes to CAN frame contents, CAN data length code (DLC) handling and TX_DL/RX_DL configuration.
Timing and flow control: Defines transport-layer timing parameters, timeouts, flow-control behavior (including WFTmax wait-frame limits), wait frame error handling and interleaving rules for concurrent transfers.
Unconfirmed communication: The transport protocol is specified as unconfirmed communication (no guaranteed end-to-end acknowledgement).
Compatibility notes: Supports both CAN Classical (CAN CC) and CAN FD features conceptually; the document does not mandate whether referencing standards require CAN CC, CAN FD or both.

Applications and who uses it

ISO 15765-2:2024 is essential for:

Vehicle OEM system architects and ECU designers implementing diagnostic communication over CAN
Tier-1 suppliers and embedded software engineers developing transport layer stacks
Diagnostic tool and OBD scan-tool manufacturers implementing UDS/OBD message transport
Test labs, conformance testers and integrators verifying timing, addressing and flow control Practical use cases include UDS-based diagnostics (ISO 14229-2), emissions-related OBD (ISO 15031, SAE J1979), WWH-OBD (ISO 27145), and end-of-life pyrotechnic activation (ISO 26021 series).

Related standards

ISO 11898-1 (CAN data link layer)
ISO 14229-2 (UDS - abstract service primitive interface)
ISO 15031 series / SAE J1979 (OBD)
ISO 27145 (WWH-OBD)
ISO 26021 (pyrotechnic device activation)

Keywords: ISO 15765-2:2024, DoCAN, diagnostic communication, CAN transport protocol, network layer services, UDS, OBD, CAN FD, ISO 11898-1.

Related standards

Standards mentioned in the description

Abstract

Overview

Key topics and technical requirements

Transport and network layer services: Defines abstract service primitives (T_Data) and how they map to lower-layer TL_Data, including parameter mapping and service data unit structure.
PDU types and protocol control information: Specifies Single Frame (SF), First Frame (FF), Consecutive Frame (CF) and Flow Control (FC) TL_PDU formats and TL_PCI fields used for segmented message transport.
Addressing formats: Covers normal, normal fixed, extended and mixed addressing for CAN identifiers and how address information (AI) is encoded in the NL_PDU.
Frame mapping and DLC handling: Describes mapping of transport/network attributes to CAN frame contents, CAN data length code (DLC) handling and TX_DL/RX_DL configuration.
Timing and flow control: Defines transport-layer timing parameters, timeouts, flow-control behavior (including WFTmax wait-frame limits), wait frame error handling and interleaving rules for concurrent transfers.
Unconfirmed communication: The transport protocol is specified as unconfirmed communication (no guaranteed end-to-end acknowledgement).
Compatibility notes: Supports both CAN Classical (CAN CC) and CAN FD features conceptually; the document does not mandate whether referencing standards require CAN CC, CAN FD or both.

Applications and who uses it

ISO 15765-2:2024 is essential for:

Vehicle OEM system architects and ECU designers implementing diagnostic communication over CAN
Tier-1 suppliers and embedded software engineers developing transport layer stacks
Diagnostic tool and OBD scan-tool manufacturers implementing UDS/OBD message transport
Test labs, conformance testers and integrators verifying timing, addressing and flow control Practical use cases include UDS-based diagnostics (ISO 14229-2), emissions-related OBD (ISO 15031, SAE J1979), WWH-OBD (ISO 27145), and end-of-life pyrotechnic activation (ISO 26021 series).

Related standards

ISO 11898-1 (CAN data link layer)
ISO 14229-2 (UDS - abstract service primitive interface)
ISO 15031 series / SAE J1979 (OBD)
ISO 27145 (WWH-OBD)
ISO 26021 (pyrotechnic device activation)

Keywords: ISO 15765-2:2024, DoCAN, diagnostic communication, CAN transport protocol, network layer services, UDS, OBD, CAN FD, ISO 11898-1.

ISO 15765-2:2024 PDF

Technical details

Abstract

Overview

Key topics and technical requirements

Applications and who uses it

Related standards

Related standards

Abstract

Overview

Key topics and technical requirements

Applications and who uses it

Related standards

Related standards

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