IEC 62386-105:2024

Overview

IEC 62386-105:2024 - Digital addressable lighting interface (DALI) - Part 105: Firmware transfer defines particular requirements for firmware transfer in control gear and control devices used in digitally controlled lighting systems. This second edition (2024) revises the 2020 edition and establishes a firmware update framework for bus-connected lighting units (bus units). The standard focuses on safe, interoperable in-field firmware updates primarily for bug fixes, while acknowledging controlled use for feature extensions - with attention to risks to the overall lighting system.

Key topics and technical requirements

• Scope and purpose: Applies to control gear and control devices managed via digital signals on the IEC 62386 bus. Targets firmware update of bus units after production or shipping.
• Transmission protocol and framing: Defines the transmission structure (including 32‑bit forward frame encoding) and timing requirements for firmware transfer.
• Commands and variables: Several commands have been modified, renamed, and added; variables have been changed and extended to support robust update control.
• Data transfer and block management: Specifies block definitions (including Block 0 and subsequent blocks), block acceptance rules, CRC16 integrity checking and error recovery mechanisms.
• Update process and lifecycle: Describes start, data transfer, finish, cancel, restart and power‑on behaviors; includes requirements for restart and power‑on handling during/after updates.
• Security and safety guidance: Requires consideration of risks, especially where updates could negatively affect system-wide operation; includes recommendations for emergency control gear implementations.
• Documentation and examples: Adds example process-flow diagrams and normative annexes (update file description, CRC calculation) plus informative annexes with process examples and management checklists.

Practical applications and who uses it

• Device manufacturers: Control gear and control device OEMs implement compliant firmware transfer mechanisms to enable field fixes and controlled updates while preserving interoperability.
• Lighting system integrators / installers: Use firmware update procedures to maintain deployed lighting networks, apply bug fixes, and manage version control across bus units.
• Facility managers / building operators: Benefit from safe update practices to minimize downtime and maintain emergency lighting compliance.
• Test labs and certification bodies: Validate firmware transfer behavior against IEC 62386-105 requirements.

Related standards

• IEC 62386-101 - General requirements for system components
• IEC 62386-102 - General requirements for control gear
• IEC 62386-103 - General requirements for control devices
• IEC 62386-104 - Wireless and alternative wired system components

Keywords: IEC 62386-105:2024, firmware transfer, firmware update, digital addressable lighting interface, DALI, control gear, control devices, bus unit, CRC16, update protocol.