ISO IEC 24740-2008 PDF

Full title and description

Information technology — Responsive Link (RL). This International Standard specifies the communications protocol and interface for Responsive Link (RL), a real‑time communications method intended for parallel and distributed control applications; it corresponds to functions specified in layers 1 through 4 of the OSI reference model.

Abstract

ISO/IEC 24740:2008 defines the protocol, interface and functional behaviour of the Responsive Link (RL) real‑time communications method used for coordination and control in parallel/distributed systems. The document focuses on the lower OSI layers (physical, data link, network and transport) required to achieve deterministic or timely exchange of control information.

General information

• Status: Published (International Standard; confirmed on review).
• Publication date: 2008 (ISO record lists publication as January 2008 / edition 1).
• Publisher: International Organization for Standardization / International Electrotechnical Commission (ISO/IEC).
• ICS / categories: 35.200 (Information technology — interconnection of information technology equipment).
• Edition / version: Edition 1 (2008).
• Number of pages: 18 (ISO bibliographic listing); some national/adopted documents and reseller catalogues report longer page counts (reports range from ~28 to 40 pages).

Scope

This standard specifies the communications protocol and interface for Responsive Link (RL) to enable real‑time exchange of control data in parallel and distributed control systems. It addresses the behaviour and message exchange relevant to OSI layers 1–4 (physical, data link, network and transport) so that devices and systems can interoperate for timing‑sensitive control functions. The scope is focused on protocol and interface definitions rather than higher‑level application semantics.

Key topics and requirements

• Definition of the Responsive Link (RL) protocol stack covering OSI layers 1–4.
• Specifications for physical and data‑link behaviour required to support real‑time control messaging.
• Network and transport layer message formats and procedures to ensure timely delivery for parallel/distributed control.
• Interface definitions for device interconnection and message exchange to promote interoperability among implementations.
• Normative requirements that enable implementers to test and verify conformance to the RL protocol (behavioural and timing constraints implied).

Typical use and users

Primary users include systems and network engineers, device and equipment manufacturers, integrators of parallel or distributed control systems (for example industrial automation or specialized control networks), and standards developers who need a lower‑layer protocol for timely control message exchange. National standards bodies and organizations adopting ISO/IEC standards for interconnection may also use the document when creating national adoptions.

Related standards

ISO/IEC 24740:2008 was developed within ISO/IEC JTC 1/SC 25 (standards for interconnection and related equipment). Related SC25 standards and other JTC 1 documents covering interconnection, cabling and device interfaces are typically relevant when integrating RL‑based systems. Implementers often consider adjacent SC25 documents and national adoption texts when planning deployment.

Keywords

Responsive Link; RL; real‑time communications; parallel control; distributed control; protocol; interface; OSI layers 1–4; ISO/IEC 24740:2008.

FAQ

Q: What is this standard?

A: ISO/IEC 24740:2008 is an International Standard titled "Information technology — Responsive Link (RL)" that specifies the RL communications protocol and interface for real‑time control in parallel/distributed systems.

Q: What does it cover?

A: It covers the protocol definitions and interface behaviour corresponding to OSI layers 1 through 4 (physical, data link, network and transport) necessary to achieve timely, interoperable exchange of control messages for RL implementations.

Q: Who typically uses it?

A: Systems and network engineers, device manufacturers, integrators of real‑time control systems, and standards bodies or test labs that need to ensure interoperability at lower protocol layers.

Q: Is it current or superseded?

A: ISO records list ISO/IEC 24740 as published in 2008 and confirmed as the published edition; users should check national standards bodies or ISO for any later revisions or withdrawal notices when planning adoption. The ISO bibliographic record is the authoritative starting point for current status.

Q: Is it part of a series?

A: The standard was produced under ISO/IEC JTC 1/SC 25 (interconnection standards). While not explicitly a multi‑part series, it is related by subject matter to other SC25 interconnection and device interface standards; implementers often review nearby SC25 documents when integrating RL.

Q: What are the key keywords?

A: Responsive Link (RL), real‑time communications, protocol, interface, OSI layers 1–4, parallel control, distributed control, ISO/IEC 24740:2008.