ISO 14229-8:2020

INTERNATIONAL ISO
STANDARD 14229-8
First edition
2020-02
Road vehicles — Unified diagnostic
services (UDS) —
Part 8:
UDS on Clock eXtension Peripheral
Interface (UDSonCXPI)
Véhicules routiers — Services de diagnostic unifiés (SDU) —
Partie 8: Partie 8: SDU sur l’interface périphérique d’extension
d’horloge (UDSonCXPI)
Reference number
ISO 14229-8:2020(E)
©
ISO 2020

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ISO 14229-8:2020(E)

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ISO 14229-8:2020(E)

Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Abbreviated terms . 2
5 Conventions . 2
6 SIP – Service interface parameters . 2
6.1 SIP – General . 2
6.2 SIP — Data type definitions . 2
6.3 SIP — A_Mtype, message type . 3
6.4 SIP — A_TAtype, target address type . 3
6.5 SIP — A_TA, target address . 3
6.6 SIP — A_SA, source address . 3
6.7 SIP — A_Length, length of A_PDU . 4
6.8 SIP — A_Data, protocol data unit . 4
6.9 SIP — A_SCT, sequence count . 4
6.10 SIP — A_Result, result. 4
6.11 SIP — ev_wakeup_ind, event wake-up indication (optional) . 4
6.12 SIP — cmd_wakeup_req, command wake-up request . 5
6.13 SIP — NMInfo, network management information . . 5
7 APP – Application . 5
7.1 APP – General . 5
7.2 APP – Definition of diagnostic classes . 6
7.2.1 APP – Overview . 6
7.2.2 APP – Diagnostic class I . 6
7.2.3 APP – Diagnostic class II. 6
7.2.4 APP – Diagnostic class III . 6
7.3 APP – CXPI master node requirements – Master node fault management, sensor
reading, I/O control . 7
7.4 APP – CXPI slave node requirements . 7
7.4.1 APP – General . 7
7.4.2 APP – Error indications . 7
7.5 APP – CXPI measurement and control data diagnostics . 7
7.5.1 APP – Master handling of slave failure status measurement and control data . 7
7.5.2 APP – Slave node current failure status support . 7
7.6 APP – Network management (optional) . 8
7.7 APP – CXPI master node gateway application . 8
7.7.1 APP – General . 8
7.7.2 APP – CXPI master gateway number of subnets . 8
7.7.3 APP – CXPI master gateway address routing table . 8
7.7.4 APP – CXPI master gateway all nodes request message handling . 9
7.7.5 APP – Round trip of all node addressing with functional NAD . 9
7.7.6 APP – Round trip of all node addressing with node-specific NADs .10
8 AL – Application layer .11
8.1 AL – Client to CXPI slave node(s) communication .11
8.2 AL – Overview of UDSonCXPI services and applicability to diagnostic classes .11
8.3 AL – CommunicationControl (28 ) service .12
16
8.4 AL – UDSonCXPI services .13
8.4.1 AL – Supported functions .13
8.4.2 AL – Master node receive buffer length .14
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ISO 14229-8:2020(E)

8.4.3 AL – Message length is exceeded .14
8.5 AL – Protocol .14
8.6 AL – Timing .14
8.6.1 AL – General .14
8.6.2 AL – Timing parameter values .14
8.6.3 AL – Server timing performance requirements .14
8.6.4 AL – SuppressPosRspMsgIndicationBit .15
8.7 AL – Response pending .15
8.8 AL – CXPI slave node configuration services .16
8.8.1 AL – CXPI node configuration .16
8.8.2 AL – Slave node model .16
8.8.3 AL – WriteDataByIdentifier – AssignNodeAddress.20
8.8.4 AL – WriteDataByIdentifier – NodeDataDump .22
8.8.5 AL – ReadDataByIdentifier – NodeProductIdentification .23
8.8.6 AL – ReadDataByIdentifier – NodeSerialNumberIdentification .24
8.8.7 AL – ReadDataByIdentifier – NodeConfigurationFileAvailability .25
8.8.8 AL – WriteDataByIdentifier – SaveConfiguration .27
8.8.9 AL – WriteDataByIdentifier – AssignFrameIdentifierRange .28
9 PL – Presentation layer .29
10 SL – Session layer.29
10.1 SL – General .29
10.2 SL – A_Data and T_Data service interface parameter mapping.29
11 TL – Transport layer .30
11.1 TL – Service primitive interface adaptation – General information.30
11.2 TL – CXPI transport layer interface adaptation .30
11.2.1 TL – Mapping of session layer to transport layer service primitives .30
11.2.2 TL – Mapping of T_Data service primitive interface parameters .30
12 NL – Network layer .31
12.1 NL – Service primitive interface adaptation .31
12.1.1 NL – General information .31
12.1.2 NL – CXPI network layer interface adaptation .31
12.2 NL – CXPI master node .32
12.2.1 NL – Network layer .32
12.2.2 NL – Dynamic NAD assignment.32
12.2.3 NL – NodeIdentificationNumber .32
12.3 NL – Master message routing .32
12.3.1 NL – General .32
12.3.2 NL – Diagnostic request message routing .33
12.3.3 NL – Diagnostic response message routing .33
12.3.4 NL – Master node transport protocol support .33
12.4 NL – CXPI slave node .33
12.4.1 NL – General .33
12.4.2 NL – Node configuration handling .33
12.4.3 NL – Slave node diagnostic class II .34
12.4.4 NL – Slave node diagnostic class II – Fixed node address .34
12.4.5 NL – Slave node diagnostic class II – Ignore NAD 7E as broadcast.34
16
12.4.6 NL – Slave diagnostic class III – Network layer .34
12.4.7 NL – Slave diagnostic class III – Fixed node address .34
12.4.8 NL – Slave diagnostic class III – Accept NAD 7E as broadcast .34
16
13 DLL – Data link layer .34
Annex A (normative) DID parameter definitions .35
Annex B (informative) Guideline for P2 setting .36
CAN_Client
Bibliography .43
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ISO 14229-8:2020(E)

Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
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ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
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expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso .org/
iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 31,
Data communication.
A list of all parts in the ISO 14229 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
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ISO 14229-8:2020(E)

Introduction
This document has been created in order to enable the implementation of unified diagnostic services,
as specified in ISO 14229-1, on the clock extension peripheral interface (CXPI) networks (UDSonCXPI).
To achieve this, it is based on the Open Systems Interconnection (OSI) Basic Reference Model specified
in ISO/IEC 7498-1 and ISO/IEC 10731, which structures communication systems into seven layers.
Figure 1 illustrates the document references from ISO 14229-1, ISO 14229-2 and ISO 20794 (all parts).
This document uses only a subset of the diagnostic services defined in ISO 14229-1 (see Table 2).
Figure 1 — UDSonCXPI documents reference according to OSI model
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INTERNATIONAL STANDARD ISO 14229-8:2020(E)
Road vehicles — Unified diagnostic services (UDS) —
Part 8:
UDS on Clock eXtension Peripheral Interface (UDSonCXPI)
1 Scope
This document specifies the implementation of a common set of unified diagnostic services (UDS) on
clock extension peripheral interface networks in road vehicles. The UDSonCXPI diagnostics defines
methods to implement diagnostic data transfer between a client and the CXPI slave nodes via the CXPI
master node.
This document specifies support of three different diagnostic classes for CXPI slave nodes.
This document references ISO 14229-1 and ISO 14229-2 and specifies implementation requirements of
the UDSonCXPI communication protocol for mainly HMI (Human Machine Interface), but not limited to,
electric/electronic systems of road vehicles. UDSonCXPI defines how to implement the diagnostic data
transfer between a client and CXPI slave nodes via CXPI master node.
NOTE UDSonCXPI does not specify any requirement for the in-vehicle CXPI bus architecture.
This document refers to information contained in ISO 14229-1, ISO 14229-2 and ISO 20794 (all parts).
This document does not include any redundant information of the above-mentioned documents.
It focuses on
— additional requirements specific to the implementation of UDSonCXPI network, and
— specific restrictions in the implementation of UDSonCXPI network.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 7498-1, Information technology — Open Systems Interconnection — Basic Reference Model: The
Basic Model
ISO 14229-1, Road vehicles — Unified diagnostic services (UDS) — Part 1: Application layer
ISO 14229-2, Road vehicles — Unified diagnostic services (UDS) — Part 2: Session layer services
ISO 14229-3, Road vehicles — Unified diagnostic services (UDS) — Part 3: Unified diagnostic services on
CAN implementation (UDSonCAN)
ISO 20794 (all parts), Road vehicles — Clock extension peripheral interface (CXPI)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 14229-1, ISO 14229-2,
ISO 20794 (all parts), ISO/IEC 7498-1 apply.
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ISO 14229-8:2020(E)

ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
4 Abbreviated terms
AE address extension
APP application
C conditional
Cvt convention
GW gateway
M mandatory
ID identifier
N/A not applicable
NAD node address for slave nodes
P2 server response time
SA source address
SF single frame
TA target address
U user optional
5 Conventions
This document is based on the conventions discussed in the OSI Service Conventions
(ISO/IEC 10731:1994) as they apply for diagnostic services.
6 SIP – Service interface parameters
6.1 SIP – General
The following subclauses specify the service interface parameters and data types, which are used by
the application and application layer services.
6.2 SIP — Data type definitions
This requirement specifies the data type definitions of the UDSonCXPI service interface parameters.
REQ 0.1 SIP – Data type definitions
The data types shall be in accordance to:
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REQ 0.1 SIP – Data type definitions
— Enum = 8-bit enumeration
— Unsigned Byte = 8-bit unsigned numeric value
— Unsigned Word = 16-bit unsigned numeric value
— Byte Array = sequence of 8-bit aligned data
— 2-bit Bit String = 2-bit binary coded
— 8-bit Bit String = 8-bit binary coded
— 16-bit Bit String = 16-bit binary coded
6.3 SIP — A_Mtype, message type
This requirement specifies the message type parameter values of the CXPI service interface.
REQ 0.2 SIP – A_Mtype, message type
The A_Mtype parameter shall be of data type Enum and shall be used to identify the message type and range of
address information included in a service call.
Range: [NormalCom, DiagNodeCfg]
6.4 SIP — A_TAtype, target address type
This requirement specifies the target address type parameter values of the CXPI service interface.
REQ 0.3 SIP – A_TAtype, target address type
The A_TAtype parameter shall be of data type Enum and shall be used to encode the communication model used
by the communicating peer entities. Two communication models are specified: '1 to 1' communication, called
physical addressing, and '1 to n' communication, called functional addressing.
Range: [physical, functional]
6.5 SIP — A_TA, target address
This requirement specifies the target address parameter values of the CXPI service interface.
REQ 0.4 SIP – A_TA, target address
The A_TA parameter shall be of data type Unsigned Byte and shall be used to identify the target address of the
information to be transmitted.
Range: [0116 to FF16]
6.6 SIP — A_SA, source address
This requirement specifies the source address parameter values of the CXPI service interface.
REQ 0.5 SIP – A_SA, source address
The A_SA parameter shall be of data type Unsigned Byte and shall be used to identify the source address of the
received information.
Mtype = DiagNodeCfg: Range = [00 to FC ]
16 16
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6.7 SIP — A_Length, length of A_PDU
This requirement specifies the length of PDU parameter value of the CXPI service interface.
REQ 0.7 SIP – A_Length, length of PDU
The A_Length parameter shall be of data type Unsigned Byte and shall contain the length of the A_PDU to be
requested transmission/notified reception.
6.8 SIP — A_Data, protocol data unit
This requirement specifies the protocol data unit parameter values of the CXPI service interface.
REQ 0.8 SIP – A_Data, protocol data unit
The A_Data parameter shall be of data type Byte Array and shall contain the packet data (A_Data) content of
the request or response packet to be transmitted/received.
Range: [00 to FF ]
16 16
6.9 SIP — A_SCT, sequence count
This requirement specifies the sequence count parameter values of the CXPI service interface.
REQ 0.9 SIP – A_SCT, sequence count
The A_SCT parameter shall be of data type 2-bit Numeric and shall contain the sequence count information in
the response field to be transmitted/received.
Range: [0 to 1 ]
02 12
6.10 SIP — A_Result, result
This requirement specifies the result parameter values of the CXPI service interface.
REQ 0.10 SIP – A_Result, result
The A_Result parameter shall be of data type 16-bit Bit String and shall contain the status relating to the
outcome of a service execution. If two or more errors are discovered at the same time, then the transport or
network layer entity shall set the appropriate error bit in the Result parameter.
Range: [OK, DLL_Arb_Lost, Err_DLL_Byte, Err_DLL_CRC, Err_DLL_DLC,
   Err_DLL_DLCext, Err_DLL_Parity, Err_DLL_Framing, Err_NL_TIMEOUT_A,
   Err_TL_Ptype, Err_TL_PCI_DL_Value, Err_APP_SCT]
Range: [0 to 1 ] (1-bit per result)
2 2
6.11 SIP — ev_wakeup_ind, event wake-up indication (optional)
This requirement specifies the event wake-up indication parameter values of the CXPI service interface.
REQ 0.11 SIP – ev_wakeup_ind, event wake-up indication (optional)
The ev_wakeup_ind parameter shall be of data type Enum and shall include the event wake-up indication infor-
mation. Table 1 describes the network management values.
Range: [ev_wakeup_pulse_detect, ev_dominant_pulse_detect, ev_clk_detect, ev_clk_loss]
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Table 1 — ev_wakeup_ind, event wake-up indication (optional)
Enum values Descript
...