ISO/DIS 15765-5

Road vehicles -- Diagnostic communication over Controller Area Network (DoCAN)

Véhicules routiers -- Communication de diagnostic sur gest ionnaire de réseau de communication (DoCAN)

Standards Content (sample)

DRAFT INTERNATIONAL STANDARD
ISO/DIS 15765-5
ISO/TC 22/SC 31 Secretariat: DIN
Voting begins on: Voting terminates on:
2019-10-18 2020-01-10
Road vehicles — Diagnostic communication over
Controller Area Network (DoCAN) —
Part 5:
Specification for an in-vehicle network connected to the
diagnostic link connector

Véhicules routiers — Communication de diagnostic sur gest ionnaire de réseau de communication

(DoCAN) —

Partie 5: spécification pour un réseau véhicule connecté sur la prise de diagnostic

ICS: 43.040.15; 43.180
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ISO/DIS 15765-5:2019(E)
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ISO/DIS 15765-5:2019(E)
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ISO/DIS 15765-5:2019(E)
Contents Page

14 Foreword ......................................................................................................................................................................... iv

15 Introduction ..................................................................................................................................................................... v

16 1 Scope ....................................................................................................................................................................1

17 2 Normative references ....................................................................................................................................2

18 3 Terms and definitions ....................................................................................................................................4

19 4 Symbols and abbreviated terms .................................................................................................................4

20 4.1 Symbols .................................................................................................................................................................. 4

21 4.2 Abbreviated terms ............................................................................................................................................. 4

22 5 In-vehicle network to external test equipment connection .............................................................5

23 5.1 Overview ................................................................................................................................................................ 5

24 5.2 Transport layer (TL) ......................................................................................................................................... 6

25 5.2.1 TL – Data interface primitive parameter mapping ........................................................ 6

26 5.2.2 TL – Message segmentation .......................................................................................... 7

27 5.3 Network layer (NL) ........................................................................................................................................... 7

28 5.3.1 NL – Data interface primitive parameter mapping ........................................................ 7

29 5.3.2 NL – ISO 15765-2 network layer services ...................................................................... 8

30 5.3.3 NL – ISO 15765-2 network layer timing parameters ..................................................... 8

31 5.3.4 NL – ISO 15765-2 network layer segmentation flow control ........................................ 8

32 5.3.5 NL – ISO 15765-2 network layer functional and physical addressing ............................ 8

33 5.4 Data link layer (DLL) ..................................................................................................................................... 10

34 5.4.1 DLL – Protocol entity requirements ............................................................................. 10

35 5.4.2 DLL – Device interface requirements ........................................................................... 10

36 5.4.3 DLL – Network system requirements .......................................................................... 10

37 5.5 Physical layer (PHY) ...................................................................................................................................... 10

38 5.5.1 PHY – Physical signalling (PS) requirements ................................................................ 10

39 5.5.2 PHY – Physical Medium Attachment (PMA) requirements ......................................... 13

40 5.5.3 PHY – Physical Media Dependent (PMD) sub-layer requirements .............................. 14

41 Annex A (informative) Compatibility between test equipment and in-vehicle network

42 connected to diagnostic link connector ................................................................................................ 16

43 Bibliography ................................................................................................................................................................. 17

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iii
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ISO/DIS 15765-5:2019(E)
Foreword

46 ISO (the International Organization for Standardization) is a worldwide federation of national

47 standards bodies (ISO member bodies). The work of preparing International Standards is normally

48 carried out through ISO technical committees. Each member body interested in a subject for which a

49 technical committee has been established has the right to be represented on that committee.

50 International organizations, governmental and non-governmental, in liaison with ISO, also take part in

51 the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all

52 matters of electrotechnical standardization.

53 The procedures used to develop this document and those intended for its further maintenance are

54 described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the

55 different types of ISO documents should be noted. This document was drafted in accordance with the

56 editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).

57 Attention is drawn to the possibility that some of the elements of this document may be the subject of

58 patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

59 any patent rights identified during the development of the document will be in the Introduction and/or

60 on the ISO list of patent declarations received (see www.iso.org/patents).

61 Any trade name used in this document is information given for the convenience of users and does not

62 constitute an endorsement.

63 For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and

64 expressions related to conformity assessment, as well as information about ISO's adherence to the

65 World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see

66 www.iso.org/iso/foreword.html.

67 This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 31,

68 Data communication.
69 A list of all parts in the ISO 15765 series can be found on the ISO website.

70 Any feedback or questions on this document should be directed to the user’s national standards body. A

71 complete listing of these bodies can be found at www.iso.org/members.html.
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ISO/DIS 15765-5:2019(E)
Introduction

72 This document has been established in order to define common requirements for vehicle diagnostic

73 systems implemented on a Controller Area Network (CAN) communication link, as specified in

74 ISO 11898 series documents. Although primarily intended for diagnostic systems, it also meets

75 requirements from other CAN based systems.

76 This document has been structured according to the Open Systems Interconnection (OSI) Basic

77 Reference Model, in accordance with ISO/IEC 7498-1 [1] and ISO/IEC 10731 [2], which structures

78 communication systems into seven layers. When mapped on this model, the application protocol and

79 lower OSI layers framework requirements specified/referenced in ISO 15765 series standard are

80 structured according to Figure 1.

81 Figure 1 illustrates a standards-based documentation concept, which consists of the lower OSI layers

82 framework, which specifies requirements related to the transport layer, network layer, data link layer,

83 and physical layer standards of the OSI layers 4, 3, 2 and 1.
85 Figure 1 — CAN lower OSI layers framework
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DRAFT INTERNATIONAL STANDARD ISO/DIS 15765-5:2019(E)
87 Road vehicles — Diagnostic communication over Controller
88 Area Network (DoCAN) — Part 5: Specification for an in-
89 vehicle network connected to the diagnostic link connector
90 1 Scope

91 This document specifies requirements for controller area networks (CAN) between the in-vehicle

92 network and the diagnostic link connector of the vehicle.

93 The network presumes the use of external test equipment for inspection, diagnostics and repair, and

94 other possible use cases. This document does not specify any requirements related to the in-vehicle

95 CAN network architecture. This document defines the requirements to enable the in-vehicle CAN

96 network to successfully establish, maintain, and terminate communication with the devices externally

97 connected to the diagnostic link connector.

98 Two CAN network configurations are described in this document. In-vehicle networks connected to the

99 diagnostic link connector running with a bit rate up to 500 kbit/s can comprise multiple CAN nodes. In-

100 vehicle networks connected to the diagnostic link connector running with a bit rate >500 kbit/s can

101 comprise only one CAN node.

102 This document is the entry point for DoCAN (Diagnostic communication over CAN) and specifies OSI

103 layers 4 to 1.
104 The document describes the following content and is structured accordingly
105 ⎯ Transport layer (TL) related requirements with reference to ISO 15765-2,
106 ⎯ Network layer (NL) related requirements with reference to ISO 15765-2,
107 ⎯ Data link layer (DLL) requirements, which are composed of:
108 ⎯ DLL protocol entity requirements,
109 ⎯ DLL device interface requirements,
110 ⎯ DLL network system requirements.
111 ⎯ Physical signalling (PS) requirements, which are composed of:
112 ⎯ PS entity requirements,
113 ⎯ PS device interface requirements,
114 ⎯ PS network system requirements.
115 ⎯ Physical medium attachment (PMA) requirements, which are composed of:
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ISO/DIS 15765-5:2019(E)
116 ⎯ PMA protocol entity requirements,
117 ⎯ PMA device interface requirements.
118 ⎯ Physical medium dependent (PMD) requirements, which are composed of:
119 ⎯ PMD entity requirements,
120 ⎯ PMD device interface requirements,
121 ⎯ PMD network system requirements.

122 The physical signalling sub-layer is implemented in the CAN protocol controller. The physical medium

123 attachment sub-layer is implemented normally in the CAN transceiver or the System Base Chip (SBC).

124 Optionally it may comprise also additional protection circuitry. The media-dependent sub-layer

125 comprises the connectors and the cabling.

126 Figure 2 shows an implementation example of the data link and physical layers block diagram.

127
128 Figure 2 — Implementation example of lower OSI layers block diagram

129 Above structure is chosen to provide the following implementers with relevant requirements:

130 ⎯ Transceiver developers,
131 ⎯ Device (e.g., electronic control unit) developers,
132 ⎯ System network developers.

133 All requirements are numbered and headlined uniquely, so that each implementer can reference them.

134 2 Normative references

135 The following documents are referred to in the text in such a way that some or all of their content

136 constitutes requirements of this document. For dated references, only the edition cited applies. For

137 undated references, the latest edition of the referenced document (including any amendments) applies.

138 ISO 11898-1:2015, Road vehicles — Controller area network (CAN) — Part 1: Data link layer and physical

139 signalling

140 ISO 11898-2:2016, Road vehicles — Controller area network (CAN) — Part 2: High-speed medium access

141 unit
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142 ISO 15031-3:2016, Road vehicles — Communication between vehicle and external equipment for

143 emissions related diagnostics — Part 3: Diagnostic connector and related electrical circuits, specification

144 and use

145 ISO 15765-2:2016, Road vehicles — Diagnostic communication over Controller Area Networks

146 (DoCAN) — Part 2: Transport protocol and network layer services
147 SAE J1962, Diagnostic Connector
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ISO/DIS 15765-5:2019(E)
148 3 Terms and definitions

149 For the purposes of this document, the terms and definitions given in ISO 15765 and ISO 11898 series

150 apply.
151 4 Symbols and abbreviated terms
152 4.1 Symbols
153 f nominal bit rate
154 f data bit rate

155 L length of cable between in-vehicle network CAN interface and diagnostic link connector

CABLE
156 SP nominal arbitration bit sample point position a
157 SP nominal data bit sample point position a
158 t arbitration bit time
159 t data bit time
160 t nominal arbitration bit time quantum length
161 t nominal data bit time quantum length
162 t arbitration bit resynchronisation jump width
SJWa
163 t data bit resynchronisation jump width
SJWd
164 4.2 Abbreviated terms

165 For the purposes of this document, the abbreviations given in ISO 15765 and ISO 11898 series apply.

166 AL application layer
167 DLL data link layer
168 LSb least significant bit
169 MSb most significant bit
170 Mtype message type
171 NL network layer
172 PDU protocol data unit
173 PHY physical layer
174 SA source address
175 SP sample point
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176 TA target address
177 TL transport layer
178 Ttype target type
179 5 In-vehicle network to external test equipment connection
180 5.1 Overview

181 Table 1 provides an overview about the technical requirements and associated requirement number.

182 Table 1 — Technical requirements overview
REQ # Technical requirement title
4 Transport layer (TL)
4.1 TL – TL_Data interface primitive parameter mapping
4.2 TL – ISO 15765-2 Classical CAN
4.3 TL – ISO 15765-2 CAN Flexible Data Rate
3 Network layer (NL)
3.1 NL – NL_Data interface primitive parameter mapping
3.2 NL – ISO 15765-2 network layer services
3.3 NL – ISO 15765-2 network layer timing parameters
3.4 NL – Definition of Flow Control parameter values
3.5 NL – 29-bit CAN identifier functional and physical addressing
3.6 NL – Uniqueness of device diagnostic address
3.7 NL – Maximum number of device CAN identifiers
3.8 NL – Addressing formats (11-bit CAN identifier)
3.9 NL – Addressing formats (29-bit CAN identifier)
3.10 NL – Functional addressing
3.11 NL – Physical addressing
3.12 NL – Device acceptance of CAN identifier
2 Data link layer (DLL)

2.1 DLL – Protocol entity requirements – Mapping of upper OSI layer service interface parameters

2.2 DLL – Protocol entity requirements – ISO 11898-1 compliance
2.3 DLL – Network system requirements
1 Physical layer (PHY)
1.1 PHY – PS entity requirements – ISO 11898-1 compliance

1.2 PHY – PS device interface requirements – Classical CAN bit timing parameters

1.3 PHY – PHY – PS device interface requirements – CAN FD sampling method
1.4 PHY – PS device interface requirements – CAN FD bit timing parameters
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REQ # Technical requirement title

1.5 PHY – PS device interface requirements – CAN FD transmitter delay compensation

1.6 PHY – PS device interface requirements – Termination resistance
1.7 PHY – PMA entity requirements – ISO 11898-2 compliance
1.8 PHY – PMA entity requirements – Qualification
1.9 PHY – PMD entity requirements – Diagnostic link connector

1.10 PHY – PMD entity requirements – DoCAN pin assignment on diagnostic link connector

1.11 PHY – PMD entity requirements – Cable characteristics between vehicle network connected to

the diagnostic link connector for bit rates >500 kbit/s

1.12 PHY – PMD network system requirements – Cable length between single CAN node a

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