ISO/IEC 14908-1:2012

Overview

ISO/IEC 14908-1:2012 - Information technology - Control network protocol - Part 1: Protocol stack defines a layered communication protocol for local area control networks. The standard specifies peer-to-peer communication services across layers 2 to 7, including the MAC sublayer interface to the physical layer and the message types used by applications for exchanging application and network-management data. It supports multiple transmission media at the physical layer and is suitable for both peer-to-peer and master‑slave control strategies.

Key topics and technical requirements

• Layered protocol stack (layers 2–7): Detailed specifications for the MAC sublayer, link, network, transaction control, transport, session, and presentation/application layers.
• MAC sublayer & data link services: Defines MPDU format, MAC-to-physical interface and access method (including a predictive p‑persistent CSMA overview), optional priority and collision detection features.
• Multiple physical media support: The defined interface enables different transmission media at the physical layer.
• Link and transport mechanisms: Link-layer CRC and transmit algorithms; transport layer TPDU types, state variables, send/receive behavior and retry/timer considerations.
• Network layer functions: Address recognition, routing, router behavior, and subnet learning algorithms to support local-area control topologies.
• Transaction, session and security: Transaction control sublayer, session request–response protocols, authentication and encryption algorithm descriptions (protocol-level security primitives and random number requirements are addressed).
• Application services & network variables: APDU/SPDU/NPDU formats, network variable processing, and offline request‑response messaging semantics.
• Network management & diagnostics: Node states, management services, NMPDU/DPDU formats, router management commands and procedures for configuration, download, diagnostics and error handling.

Practical applications and users

ISO/IEC 14908-1:2012 is used where reliable, deterministic local control networking is required, including:

• Building and facility automation (HVAC, lighting, access control)
• Industrial local control systems and device networks
• Smart-building and IoT device manufacturers implementing control protocols
• System integrators and network engineers designing control-area topologies and routers
• Firmware and embedded software developers implementing protocol stacks for control devices

Users adopt this standard to ensure interoperable, peer-to-peer control messaging, robust network management and support for multiple physical media.

Related standards

• ISO/IEC 14908-1:2012 is part of the ISO/IEC 14908 family (control network protocol series). Refer to other parts of the 14908 series for media- and application-specific guidance and complementary specifications.

Keywords: ISO/IEC 14908-1:2012, control network protocol, protocol stack, local area control networks, MAC sublayer, transport layer, network management, peer-to-peer control.