In the article: “Understanding different protocols – SeaTalk1 & SeaTalkNG” interfacing electronics developer Actisense, specialists in NMEA technologies, sensors and gateways for maritime electronics, explains the difference between both new and legacy SeaTalk connected onboard equipment and the NMEA 0183 and 2000 protocols.
SeaTalk1: The Legacy Protocol
Many boaters mistakenly assume SeaTalk1 (ST1) is identical to NMEA 0183. While both use serial data protocols, ST1 is actually a proprietary system developed by Raymarine with distinct characteristics, and which uses a unique 3-wire connection system:
- 12V Supply
- Ground/Common Supply
- Data (Serial)
While SeaTalk1 devices remain common in 2024, they’re not directly compatible with NMEA 0183. However, conversion solutions exist through specialized ST1 to NMEA 0183 converters.
For those looking to integrate ST1 devices into modern networks, Raymarine offers an ST1 to SeaTalkNG converter, enabling legacy equipment to access NMEA 2000 data.
SeaTalkNG and NMEA 2000: Modern Maritime Networking
NMEA 2000 represents a significant advancement over its predecessor, featuring:
- Binary messaging format
- 250k bits/second transmission speed
- CAN (Controller Area Network) architecture
- Multi-talker/multi-listener capability
A common source of confusion in the marine industry is the relationship between NMEA 2000 and SeaTalkNG (STNG). Here’s what you need to know:
- Protocol Level: NMEA 2000 and STNG are identical, using the same CAN protocol and PGN messages
- Physical Layer: The only difference lies in the connection hardware
- NMEA 2000 uses standard DeviceNet M12 connectors
- SeaTalkNG employs Raymarine’s proprietary cable system
Bridging the Gap
The good news is that connecting STNG and NMEA 2000 networks is straightforward with the right adapter cable. Marine electronics specialists like Actisense offer NMEA 2000 products bundled with the necessary adapter cable for seamless integration.
For expert guidance on marine network solutions and professional-grade NMEA products, visit the Actisense website >>
