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GB/T 41590.2-2022Road vehicles - Diagnostic communication over K-Line ((DoK-Line) - Part 2: Data link layer (English PDF)

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

July 11, 2022

Implementation date

February 1, 2023

Scope

GB/T 41590.2-2022 (Road vehicles - Diagnostic communication over K-Line ((DoK-Line) - Part 2: Data link layer) is available as an English-translated PDF.

GB/T 41590.2-2022 is the Chinese standard "Road vehicles - Diagnostic communication over K-Line ((DoK-Line) - Part 2: Data link layer".

Its scope clause reads: This Document specifies data link layer services tailored to meet the requirements of UART- based vehicle communication systems on K-Line as specified in ISO 14230-1.It has been defined in accordance with the diagnostic services established in ISO 14229-1 and ISO 15031- 5, but is not limited to use with them and is also compatible with most other communication needs for in-vehicle networks.

The protocol specifies an unconfirmed communication. The diagnostic communication over K-Line (DoK-Line) protocol supports the standardized service primitive interface as specified in ISO 14229-2.

This Document provides the data link layer services to support different application layer implementations like the following. --- enhanced vehicle diagnostics (emissions-related system diagnostics beyond legislated functionality, non-emissions-related system diagnostics); --- emissions-related OBD as specified in ISO 15031, SAE J1979-DA and SAE J2012-DA; --- in addition, this document clarifies the differences in initialization for K-line protocols defined in ISO 9141 and ISO 14230.This is important since a server supports only one of the protocols mentioned above and the client has to handle the coexistence of all protocols during the protocol determination procedure.

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Document preview — GB/T 41590.2-2022

National Standard of the People's Republic of China

Issued by: SAMR; SAC

Foreword4
Introduction5
1 Scope7
2 Normative References7
3 Terms, Definitions, Symbols and Abbreviated Terms8
3.1 Terms and Definitions8
3.2 Symbols and abbreviated terms8
4 Conventions10
5 Document Overview10
6 Physical Bus Topology11
7 Data Link Layer Overview13
7.1 General13
7.2 Format description of data link layer services13
7.3 Services provided by the data link layer to higher layers13
7.4 Specification of DoK-Line data link layer service primitives15
7.5 Service data unit specification17
8 Protocol Initialization22
8.1 General22
8.2 Timing parameters for 5-BAUD_INIT22
8.3 Protocol determination23
8.4 Protocol specific key bytes32
9 Message Definition34
9.1 Message structure34
9.2 Message header35
9.3 Protocol data unit (PDU)38
9.4 Checksum byte (CS)38
10 Protocol Timing Requirements38
10.1 General timing measurement requirements38
10.2 Protocol timing parameter definition39
10.3 Inter-byte message timing40
10.4 Data link layer timing at T-Data interface41
11 Communication Services44
11.1 StartCommunication service44
11.2 StopCommunication service45
11.3 AccessTimingParameter service47
11.4 SendData service50
12 Data Collisions51
13 Error Handling51
13.1 Error handling during physical/functional 5-BAUD initialization51
13.2 Error handling during physical/functional FAST_INIT52
13.3 Error handling after physical/functional initialization54
Annex A (Normative) Server and Client Addresses for 5-BAUD_INIT56
A.1 Physical addresses56
A.2 Functional addresses56
Annex B (Informative) Recommended Server and Client Addresses57
Annex C (Informative) Protocol Comparison of Initialization Sequence58
Bibliography59

1 Scope

This Document specifies data link layer services tailored to meet the requirements of UART- based vehicle communication systems on K-Line as specified in ISO 14230-1.It has been defined in accordance with the diagnostic services established in ISO 14229-1 and ISO 15031-

5, but is not limited to use with them and is also compatible with most other communication needs for in-vehicle networks. The protocol specifies an unconfirmed communication.

The diagnostic communication over K-Line (DoK-Line) protocol supports the standardized service primitive interface as specified in ISO 14229-2.

This Document provides the data link layer services to support different application layer implementations like the following.

--- enhanced vehicle diagnostics (emissions-related system diagnostics beyond legislated functionality, non-emissions-related system diagnostics);

--- emissions-related OBD as specified in ISO 15031, SAE J1979-DA and SAE J2012-DA;

--- in addition, this document clarifies the differences in initialization for K-line protocols defined in ISO 9141 and ISO 14230.This is important since a server supports only one of the protocols mentioned above and the client has to handle the coexistence of all protocols during the protocol determination procedure.

2 Normative References

The provisions in following documents become the essential provisions of this Document through reference in this Document. For the dated documents, only the versions with the dates indicated are applicable to this Document; for the undated documents, only the latest version (including all the amendments) is applicable to this Document.

ISO 14230-4 ROAD Vehicles - Diagnostic Systems - Keyword Protocol 2000 - Part 4.

Requirements for Emission-Related Systems

NOTE. GB/T 41590.4-2022 Road Vehicles - Diagnostic Communication over K-Line (DoK-Line)

- Part 4.Requirements for Emission-Related Systems (ISO 14230-4.2000, IDT)

GB/T 41588.3 | GB/T 41588.4 | GB/T 41590.3 | GB/T 41588.2 | […]

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — all pages — is available in the English PDF.

Referenced standards

Normative references

GB/T 41590.4-2022Road vehicles - Diagnostic communication over K-Line (DoK-Line) - Part 4: Requirements for emission-related systems

ISO 14230

Cited by

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