Raymarine hsb2 PLUS Series Owner's Handbook Manual page 199

Chapter 8: Installation
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Figure 8-14: Integrated System with Repeater Display and NMEA Instruments
SeaTalk
The SeaTalk standard was originally developed by Autohelm (part of
Raymarine), and allows compatible instruments to be connected by a single
cable carrying power and data in/out. This means that additional instruments
and functions can be added to a SeaTalk system, simply by plugging them into
the network.
SeaTalk is a precise, high-speed, bi-directional protocol which is flexible
enough to adapt to any number of instruments, without a central processor.
SeaTalk equipment can also communicate with non-SeaTalk equipment via
the NMEA standard.
2
Series Display
hsb
GPS
NMEA
Gyro
Plus 2
Unit
NMEA
12/24V Supply
SeaTalk
2
Series Display
hsb
SeaTalk
2
hsb
NMEA Out
Non SeaTalk
Pilot
12/24V Supply
NMEA
SeaTalk
8-25
Distribution
Panel
12/24V
Supply
D4287-3