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

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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.

Basic Data

Standard ID	GB/T 41590.2-2022 (GB/T41590.2-2022)
Description (Translated English)	Road vehicles - Diagnostic communication over K-Line ((DoK-Line) - Part 2: Data link layer
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	T35
Word Count Estimation	50,529
Issuing agency(ies)	State Administration for Market Regulation, China National Standardization Administration