SAE J2799-2024 PDF

Full title and description

SAE J2799-2024 — Hydrogen Surface Vehicle to Station Communications Hardware and Software. Specifies the hardware, protocol and software requirements for optional vehicle-to-station communications used during compressed hydrogen refueling of surface vehicles (light- and heavy-duty fuel cell vehicles, buses and industrial trucks). The 2024 edition updates the communications protocol and hardware geometry to support higher-flow fueling protocols and expanded data capability.

Abstract

SAE J2799 defines the vehicle-side and station-side communications hardware and message formatting used to support communications-enabled hydrogen refueling. The standard describes the physical interface options, infrared communications geometry and electrical/firmware requirements, a structured data field and protocol versioning (including a 2.00 protocol update in the 2024 edition) that enable exchange of vehicle tank and fueling parameters with dispensers operating to SAE fueling protocols.

General information

• Status: Current (revised).
• Publication date: June 10, 2024.
• Publisher: SAE International.
• ICS / categories: Automotive and hydrogen fueling systems (example classifications cited for related listings: ICS 43.060 — Internal combustion engines for road vehicles; ICS 71.100 — Products of the chemical industry).
• Edition / version: 2024 edition — product code J2799_202406; communications protocol version 2.00 (introduced in the 2024 revision).
• Number of pages: 39 (2024 edition).

Scope

This standard covers the hardware and software requirements for optional vehicle-to-station communications for compressed hydrogen surface vehicle refueling. It is intended for use alongside SAE fueling and connector standards (notably SAE J2601 fueling protocols and SAE J2600 nozzle/receptacle geometry). The scope includes message structure and data fields, timing and range requirements, infrared hardware geometry and mechanical considerations needed to reliably exchange fueling and vehicle tank information to support communications-enabled fueling strategies, including higher-flow (high‑flow) fueling protocols.

Key topics and requirements

• Definition of vehicle- and dispenser-side communications hardware (physical and electrical interface requirements).
• Infrared (IrDA-style) geometry and alignment requirements for receptacles/nozzles to ensure reliable data transfer.
• Message and data-field structure (OD fields, TV ranges) and formatting rules to carry vehicle tank, sensor and fueling parameters.
• Protocol versioning and backward-compatibility guidance — introduction of protocol 2.00 to support high-flow fueling use cases.
• Timing, handshaking and error handling for communications during fueling operations.
• Operational guidance for integration with SAE J2601 fueling protocols and optional use cases where communications are not available.
• Requirements to support both 35 MPa and 70 MPa refueling classes where applicable, and adaptations for heavy-duty applications.

Typical use and users

Used by automotive OEMs, hydrogen-station designers and dispenser manufacturers, fueling system integrators, test laboratories, regulators and infrastructure planners to implement and validate optional vehicle-to-station communications. Typical activities include integrating IrDA/optical communication hardware into vehicle receptacles, implementing station-side receiver/transceiver firmware, ensuring compatibility with SAE J2601 fueling algorithms, system testing and conformance checks, and permitting/inspection referencing for hydrogen refueling installations.

Related standards

Commonly used alongside SAE J2601 (Fueling Protocols for Light Duty Gaseous Hydrogen Surface Vehicles), SAE J2600 (Compressed Hydrogen Surface Vehicle Fueling Connection Devices / nozzle and receptacle geometry), SAE J2719 (Hydrogen Fuel Quality) and relevant ISO/IEC and national standards for hydrogen fueling stations (for example ISO 19880‑1 for gaseous hydrogen fueling station requirements). It forms part of the SAE hydrogen fueling standards family addressing connectors, fueling protocols and fuel quality.

Keywords

hydrogen fueling, FCEV, vehicle-to-station communication, IrDA, infrared communications, receptacle geometry, SAE J2799, J2601, J2600, high-flow fueling, 70 MPa, 35 MPa, fueling protocol.

FAQ

Q: What is this standard?

A: SAE J2799-2024 is an SAE technical standard that specifies optional vehicle-to-station communications hardware and software for hydrogen surface vehicle refueling, including physical interface characteristics and the message/protocol rules used during communications-enabled fueling.

Q: What does it cover?

A: It covers the physical and electrical requirements for communications hardware (commonly optical/infrared), the geometry/alignment requirements for receptacle/nozzle communications, message formats and data-field rules, timing and handshaking procedures, and versioning to support higher‑flow fueling protocols and expanded data payloads.

Q: Who typically uses it?

A: Automotive OEMs, hydrogen dispenser and station manufacturers, system integrators, test labs, infrastructure planners and permitting authorities use the standard to design, implement and validate vehicle–station communications for hydrogen refueling.

Q: Is it current or superseded?

A: The 2024 edition published June 10, 2024 is the current/revised edition. Earlier editions include 2019, 2014 and the original 2007 versions; those older editions have been superseded by the 2024 revision for users seeking the latest protocol and hardware updates.

Q: Is it part of a series?

A: Yes — J2799 is part of the SAE hydrogen fueling standards family that includes SAE J2601 (fueling protocols), SAE J2600 (nozzle/receptacle geometry), SAE J2719 (fuel quality) and other related documents that together define the technical ecosystem for hydrogen refueling.

Q: What are the key keywords?

A: Hydrogen fueling, vehicle-to-station communication, IrDA, receptacle, nozzle, SAE J2799, J2601, J2600, high-flow fueling, compressed hydrogen, fuel cell vehicle.