New Firmware V2.0 for LUMA™ 100/250/500, and LUMA™ flex Modems

July, 2025 – Lausanne, Switzerland

V2.0

A powerful new firmware release is now available for several LUMA modems, bringing a range of new features to simplify configuration, improve communication reliability, and significantly reduce power consumption.

✨ Adds features

✨ Boosts reliability

✨ Power efficiency

5 New Key Features

1. New ACK Mode

A new Acknowledgement (ACK) mode enables packet retransmission until the receiver confirms delivery. This ensures reliable communication in challenging subsea environments without additional higher-level protocols.

2. Seamless RS232 / RS485 Switching

You can now switch between RS232 and RS485 communication directly using the LumaConf software – there is no need to reflash your device anymore.

3. Advanced Sleep Modes

The latest firmware introduces major improvements to the sleep mode functionality:

Sleep/Wake Optimization: Easily fine-tune your device's sleep mode with more intuitive parameters and greater granularity, making setup faster, simpler, and more precise.
Ultra-Low Power: Power consumption reduced by up to 95% when using cable-triggered wakeup.*
Timer-Based Sleep: New mode allows modems to automatically wake up from sleep, check for incoming communication, establish a connection if another modem is detected, or return to sleep if no communication was found.*

4. SWiG L1 Standard Compliance

The new firmware ensures compliance with the SWiG L1 standard when extended features such as ACK mode or error correction are not in use. This allows seamless integration into standardized subsea communication systems.

The Subsea Wireless Group (SWiG) is an international industry network promoting interoperability and interchangeability for subsea wireless communications. SWiG develops and maintains standards for wireless communication technologies across the subsea industry, including LUMA optical communication.

View SWiG

5. Enhanced LumaConf Integration

The firmware is fully supported by a new version of the LumaConf configuration tool, which offers an improved user experience and automatic firmware detection for streamlined updates.

* Only available on the new hardware revision of the modem.

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Upgrade Notes 📝

Please note that this firmware version is not compatible with the previous LumaConf release. Both the new and legacy versions are available on our website to support backwards compatibility (links in the manual).

Firmware Compatibility Notice 🪧

Firmware updates must be applied to both modems in a communication pair, as updates may introduce protocol changes that can make communication between mismatched firmware versions incompatible.

How to Update ❓

Download the latest version of the manual, then follow the link provided in the manual to download LumaConf and run it. It will detect older firmware versions and guide you through the upgrade process to version V2.0