ISO 20794-2:2020 PDF

Name: ISO 20794-2:2020 — Road vehicles — Clock extension peripheral interface (CXPI) — Part 2: Application layer
SKU: ISO 20794-2:2020
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Road vehicles — Clock extension peripheral interface (CXPI) — Part 2: Application layer

Название (английский):

ISO 20794-2:2020

Road vehicles — Clock extension peripheral interface (CXPI) — Part 2: Application layer

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 37
Дата публикации:: 5 февраля 2020 г.
Издание:: ISO IS 20794 edition 1 version 1
ICS:: 43.040.15

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Описание (английский):

This document describes the application layer protocol including the application measurement and control data management, message transfer and fault management. The application and application layer contain the following descriptions: — message structure; — communication method; — network management (optional); — measurement and control data; and — error handling. This document also specifies: — the service interface; and — the service interface parameters.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview - ISO 20794-2:2020 (CXPI Part 2: Application layer)

ISO 20794-2:2020 defines the application layer protocol for the Clock eXtension Peripheral Interface (CXPI), an automotive low‑speed single‑wire in‑vehicle network. This part specifies how applications exchange measurement and control data, manage messages and faults, and interact with lower OSI layers via a defined service interface. CXPI is intended to reduce wiring (and vehicle weight) by connecting simple devices such as switches and sensors over a single wire.

Key topics and technical requirements

Message structure and transfer

Defines application layer message formats and the A_PDU response field.
Specifies message types and PDU (protocol data unit) handling.

Service interface and parameters (SI / SIP)

Standardizes the service interface between application and lower layers (A_Data.req / A_Data.ind).
Lists SIP parameters such as Mtype, ReqId, ReqTypeId, PDU, Length, SCT (sequence count), Result, NMInfo, ev_wakeup_ind, and cmd_wakeup_req.

Communication methods

Supports two selectable node-level methods:
- Event‑triggered (event-driven publisher/subscriber communication)
- Polling (master‑controlled periodic schedule)

Network management (optional)

Node states (normal, standby, sleep), wake‑up/sleep sequences and related parameters.
Optional NM information exchanged via SIP.

Measurement and control data management

Publisher/subscriber model for measurement and control data.
Data types, consistency requirements, ReqId assignment and priority.

Error handling and fault management

Application error handling, CXPI network error reporting, optional SCT error handling, retransmission and transmission prohibition mechanisms.
Error detection features to report faults to the application.

Practical applications and target users

Typical CXPI use cases: door control modules, light switches, HVAC controls, sensors and simple actuators where wiring simplification and low cost are priorities.

Who uses this standard:

Automotive system architects and OEMs designing body and comfort networks.
ECU and microcontroller firmware engineers implementing application‑layer CXPI protocols.
Suppliers of switches, sensors, gateways and diagnostic tools integrating CXPI communication.
Test and validation teams verifying message handling, wake/sleep behavior and error management.

Related standards

Other parts of the ISO 20794 series (transport, network, data link and physical layers) - together they define the complete CXPI stack.

References to OSI models: ISO/IEC 7498‑1 and ISO/IEC 10731 (basic reference for layered communication).

Keywords: ISO 20794-2, CXPI, application layer, clock extension peripheral interface, in‑vehicle network, event‑triggered, polling, service interface parameters, automotive wiring reduction, measurement and control data.

ISO 20794-2:2020 PDF

Abstract

Похожие стандарты

Overview - ISO 20794-2:2020 (CXPI Part 2: Application layer)

Key topics and technical requirements

Practical applications and target users

Related standards

Технические детали

BS ISO 20794-3:2020

Road vehicles. Clock extension peripheral interface (CXPI). Transport and network layer.

ISO/IEC 7498-1:1994

Information technology — Open Systems Interconnection — Basic Reference Model: The Basic Model

ISO/IEC 10731:1994

Information technology — Open Systems Interconnection — Basic Reference Model — Conventions for the definitio…