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Simrad ST90
System units
Processor Unit – description
A dedicated maritime computer is provided. In this publication, the computer can also be referred to as the Processor Unit, and vice versa.

About this manual
The purpose of this publication is to provide the descriptions, procedures and detailed parameter explanations required to allow for safe and efficient use of the ST90 system. The publication also provides you with a thorough understanding of the parameters and adjustments provided by the ST90 system.
Simrad ST90
- Important
  The ST90 is an advanced product. It is used with other advanced products. There is important information that you need to know.
- System description
  The Simrad ST90 is a low-frequency fish-finding sonar with 360-degree coverage and long range. The ST90 system is designed for medium and large sized fishing vessels.
- System diagram
  The system diagram identifies the main components of a basic ST90 system. Only the main connections between the units are shown. Detailed interface capabilities and power cables are not shown.
- System units
  - Display – description
    A display is a required part of the ST90 system. For best readability, the display must be protected from glare and have the correct height and angle.
  - Processor Unit – description
    A dedicated maritime computer is provided. In this publication, the computer can also be referred to as the Processor Unit, and vice versa.
  - Operating panel – description
    The optional Operating Panel contains all necessary control functions for normal operation of the ST90 system.
  - Transceiver Unit – description
    The Transceiver Unit is provided to transmit acoustic energy through water. After each transmission, the transceiver receives the echoes from the seabed and/or the water column. These echoes are filtered, amplified and finally converted into digital format. This transmission and reception sequence is commonly referred to as a ping.
  - Hull Unit – description
    The hull unit is used to lower the transducer down below the ship’s hull when the ST90 system shall be used. When the ST90 system is turned off, the transducer is hoisted for protection. The hull unit is large and crucial part of the sonar system.
  - Transducer – description
    The cylindrical transducer allows the sonar beam to provide a full 360 degrees coverage of the water volume.
- General safety rules
  Safety is important. Observe and follow these safety precautions during all installation and maintenance work.
- Network security
  If a ST90 system is connected to a local area network, data security is important.
- Support information
  If you need technical support for your ST90 system you must contact your local dealer, or one of our support offices. A list of all our offices and dealers is available on our website. You can also contact our main support office in Norway.
Operating procedures
Maintenance procedures
User interface
Menu system
Functions and dialog boxes
Concept descriptions
Technical specifications
The technical specifications summarize the main functional and operational characteristics of the ST90 system. They also provide information related to power requirements, physical properties and environmental conditions.
Datagram formats
The ST90 system can send and receive information to and from several different peripherals. All transmissions take place as datagrams with data sentences. Each datagram has a defined format and length.
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Processor Unit – description

A dedicated maritime computer is provided. In this publication, the computer can also be referred to as the Processor Unit, and vice versa.

The Processor Unit is a rugged and powerful computer. It is designed for long life in a demanding maritime environment. The Processor Unit contains the operational software, and offers the user interface that allows you to control the ST90 system. Furthermore, it offers a number of serial and Ethernet lines for communication with external devices. The Processor Unit is normally mounted on the bridge.

HT20470

The HT20470 Processor Unit is available in two versions. The DC version operates on +24 VDC while the AC version operates on 100 to 240 VAC. A suitable power supply may be provided with the ST90 system delivery.

Power supply:

Manufacturer: Mean Well
Manufacturer’s website: https://www.meanwell.com

Type designation: SDR-240-24
Kongsberg Discovery part number: 488156

Note:

The Processor Unit does not contain any fans. It will be very warm, even during normal operation. This is by design.