GB/T 42691.2-2023: Road vehicles - Local Interconnect Network(LIN) - Part 2: Transport protocol and network layer services

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Scope

This document specifies a transport protocol and network layer services tailored to meet the
requirements of LIN-based vehicle network systems on local interconnect networks. The
protocol specifies an unconfirmed communication.
The LIN protocol supports the standardized service primitive interface as specified in ISO
14229-2.
This document provides the transport protocol and network layer services to support different
application layer implementations like
— normal communication messages, and
— diagnostic communication messages.
The transport layer defines transportation of data that is contained in one or more frames. The
transport layer messages are transported by diagnostic frames. A standardized API is specified
for the transport layer.
Use of the transport layer is targeting systems where diagnostics are performed on the backbone
bus (e.g., CAN) and where the system builder wants to use the same diagnostic capabilities on
the LIN sub-bus clusters. The messages are in fact identical to the ISO 15765-2 and the PDUs
carrying the messages are very similar.
The goals of the transport layer are
— low load on LIN master node,
— to provide full (or a subset thereof) diagnostics directly on the LIN slave nodes, and
— targeting clusters built with powerful LIN nodes (not the mainstream low cost).
A typical system configuration is shown in Figure 1.
receiver/sender, a timeout mechanism allows detection of a transmission failure (see 7.6.2).
7.4 Transport layer protocol data units
7.4.1 Protocol data unit types
The communication between the peer protocol entities of the network layer in different nodes
is done by means of exchanging N_PDUs.
This document specifies three different types of transport layer protocol data units:
— SingleFrame (SF N_PDU);
— FirstFrame (FF N_PDU);
— ConsecutiveFrame (CF N_PDU);
which are used to establish a communication path between the peer network layer entities, to
exchange communication parameters, to transmit user data and to release communication
resources.
7.4.2 SF N_PDU
The SF N_PDU is identified by the SingleFrame protocol control information (SF N_PCI). The
SF N_PDU shall be sent out by the sending network entity and received by all network entities.
Only the one entity that is addressed by the N_AI shall proceed this request for the duration of
the segmented message transmission. Other nodes which are not addressed shall reject already
pending connections. It shall be sent out to transfer a service data unit that can be transferred
via a single service request to the data link layer, and to transfer unsegmented messages.
7.4.3 FF N_PDU
The FF N_PDU is identified by the FirstFrame protocol control information (FF N_PCI). The
FF N_PDU shall be sent out by the sending network entity and received by all network entities.
Only the one entity that is addressed by the N_AI shall proceed this request for the duration of
the segmented message transmission. Other nodes which are not addressed shall reject already
pending connections. It identifies the first N_PDU of a segmented message transmitted by a
network sending entity and received by a receiving network entity. The receiving network layer
entity shall start assembling the segmented message on receipt of an FF N_PDU.
7.4.4 CF N_PDU
The CF N_PDU is identified by the ConsecutiveFrame protocol control information (CF
N_PCI). The CF N_PDU transfers segments (N_Data) of the service data unit message data
(< MessageData>). All N_PDUs transmitted by the sending entity after the FF N_PDU shall be
encoded as CF N_PDUs. The receiving entity shall pass the assembled message to the service
user of the network receiving entity after the last CF N_PDU has been received. The CF N_PDU

Basic Data

Standard ID	GB/T 42691.2-2023 (GB/T42691.2-2023)
Description (Translated English)	Road vehicles - Local Interconnect Network(LIN) - Part 2: Transport protocol and network layer services
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	T36
Classification of International Standard	43.040.15
Word Count Estimation	73,724
Date of Issue	2023-05-23
Date of Implementation	2023-12-01
Issuing agency(ies)	State Administration for Market Regulation, China National Standardization Administration