SEALINK-OEM | COMPACT SUBSEA MULTIMODE RADIO-ACOUSTIC NETWORK MODEM

Sealink-OEM Subsea Acoustic Modem

The DiveNET Sealink-OEM is a compact, high-reliability underwater acoustic modem designed for professional subsea communication, ranging, and IoT applications. Produced by DiveNET Subsea Wireless (Beringia Enterprises LLC), it delivers long-range acoustic data links in an extremely compact 73.5 mm × 44 mm OEM PCB footprint.

Key Features

• Ultra-compact form factor — 73.5 mm × 44 mm PCB for tight integration into ROV/AUV hulls and diver equipment
• Long-range acoustic communication — up to 3,000 m slant range with depth ratings to 1,000 m (transducer-dependent)
• Built-in Time-of-Flight ranging — ~0.15 m resolution acoustic distance measurement
• Multi-mode operation — Transparent channel, Command mode, and Packet mode for flexible deployment
• Logical addressing — 255 addresses (0–254) across 20 code channels for networked subsea fleets
• NMEA0183 protocol — Industry-standard text-based command interface with proprietary $PUWV sentences
• Expansion headers — Integrated support for external pressure/temperature sensors (I²C), GNSS positioning, and RF surface gateway modules
• Tx/Rx strobe output — Hardware timestamp capture for precise synchronization (firmware ≥1.2.0)

Applications

The Sealink-OEM is designed to power subsea IoT and professional underwater operations:

• ROV & AUV telemetry — Real-time command, status, and sensor data exchange between surface and submerged vehicles
• Diver communications — Wireless acoustic messaging and ranging for dive teams
• Subsea sensor networks — Meshed underwater monitoring with multi-node logical addressing
• Positioning & navigation — Acoustic ranging for relative positioning between submerged assets
• Environmental monitoring — Integrated pressure, temperature, and depth data collection with configurable output intervals

Quick Start

Connect power (+12 V nominal) to XP2 and a compatible transducer to XP1. Interface via UART at 9600 8N1 using any serial terminal (PuTTY, Tera Term, CoolTerm, minicom). Send $PUWV2,0,0,0*2A to ping a remote unit and receive an acknowledgement response with propagation time for instant ranging.

Transducer Options

The Sealink-OEM supports interchangeable transducers for different mission profiles:

• SW-T100 — ~1,000 m range / 600 m depth — ideal for moderate-range deeper operations
• SW-T200 — ~3,000 m range / 300 m depth — balanced range and depth
• SW-T300 — ~3,000 m range / 1,000 m depth — maximum range and maximum depth

Integration & Developer Resources

The Sealink-OEM ships with comprehensive developer documentation, including pinout and interface specifications, a full communication protocol reference, basic and advanced ranging guides, a Windows utility app, and integration examples for Arduino and Raspberry Pi. CAD files (STEP and STL) and a technical drawing PDF are available for mechanical integration.