Data Processing Unit; System Data Inputs; Get-You-Home Mode - Raymarine ST290 Owner's Handbook Manual

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Data Processing Unit

The Data Processing Unit (DPU) performs all system calculations and
coordinates the overall operation of the ST290 system. The DPU also
provides:
• The interfaces between the various system components.
• The power input connections for the entire ST290 system.
• A means of interfacing with equipment from other manufacturers.
The DPU is splash proof but not waterproof, so must therefore be fitted
below decks. It has a removable clip-on cover to allow easy access to
terminals.
Connections
The DPU connects to the SeaTalk and SeaTALK
ST290 to communicate with external systems via the following
internationally-accepted protocols:
• NMEA0183.
• NMEA2000.
• Universal Serial Bus (USB).
A connector for an external alarm is also provided.

System data inputs

Basic speed, depth and wind data for the system are provided by
transducers. The data from each transducer is fed via a dedicated
interface Pod, to SeaTALK
Heading information is provided by a Raymarine Smart Heading
System.
Other system data is obtained from external systems, such as a
Raymarine autopilot or GPS, when available.

Get-you-home mode

In the unlikely event that a fault occurs with the DPU, the digital
instruments are able to independently decode the speed, depth and wind
information to provide emergency navigation information until the DPU
can be restored to full operation.
Section 1: An Introduction to ST290
2
buses. It also enables
2
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ST290 Instrument System Owner's Handbook