IEC 61162-2:2024

Overview

IEC 61162-2:2024 - "Maritime navigation and radiocommunication equipment and systems - Digital interfaces - Part 2: Single talker and multiple listeners, high‑speed transmission" specifies requirements for one‑way serial data communication between maritime electronic instruments, navigation and radiocommunication equipment. The standard defines a single talker / multiple listeners architecture using printable ASCII sentences (approved or proprietary), supports higher electrical data rates than IEC 61162-1, and is intended for high‑speed transmission scenarios. The 2024 edition is a technical revision (Edition 2.0) that updates hardware alternatives and makes the data transmission rate configurable (default 38 400 bit/s).

Key topics and technical requirements

• One‑way serial transmission: data flows from a single talker to one or more listeners; no multi‑talk/arbiter mechanism.
• Data format: printable ASCII sentences as per approved or proprietary sentence rules; typical messages are about 11 to 79 characters.
• Timing: messages may require repetition rates up to once per 20 ms.
• Configurable data rate: electrical definitions accommodate higher rates than IEC 61162-1; default remains 38 400 bit/s but higher rates may be used.
• Electrical and connector specifications: includes wiring, shielding, connector and isolation guidance to support high‑speed balanced circuits.
• Limited delivery guarantees: there is no guaranteed delivery mechanism and only limited error‑checking - the standard explicitly warns against using it for safety‑critical functions without caution.
• Testing and validation: methods for interface, electrical and protocol testing, including workload and ambient condition tests, are specified.

Practical applications

IEC 61162-2 is used to interconnect maritime instruments and bridge equipment where fast, one‑way data broadcast is needed. Typical applications include:

• High‑speed distribution of navigation sensor data to multiple bridge displays and subsystems
• Interconnection of radiocommunication devices with onboard loggers and monitors
• Integration of proprietary sentence streams between equipment vendors

Because error checking and delivery guarantees are limited, IEC 61162-2 is best applied to non‑safety‑critical data distribution or in architectures where higher‑level redundancy/error handling is implemented.

Who should use this standard

• Manufacturers of maritime navigation and radiocommunication equipment
• System integrators and bridge system designers
• Shipyards and vessel automation teams
• Test laboratories and certification bodies validating interface compliance

Related standards (normative / informative)

• IEC 61162-1 (Part 1: single talker and multiple listeners, baseline data format & protocols)
• IEC 60945 (general requirements and test methods for maritime equipment)
• ITU‑T X.27 / V.11 and EIA‑485 (electrical characteristics for balanced high‑speed circuits)
• NMEA 0183 (widely referenced sentence structure for maritime sensors)

Keywords: IEC 61162-2:2024, maritime digital interfaces, single talker multiple listeners, high‑speed transmission, printable ASCII, serial data transmission, 38 400 bit/s, IEC 61162-1, NMEA 0183.