Moog Tritech Seanet SCU v5 User manual

Seanet SCU v5
0581-SOM-00002, Issue: 05 1 © Tritech International Ltd.
Seanet SCU v5
Product Manual
0581-SOM-00002, Issue: 05

Seanet SCU v5
0581-SOM-00002, Issue: 05 2 © Tritech International Ltd.
© Tritech International Ltd
The copyright in this document is the property of Tritech International Ltd. The document is supplied by Tritech International Ltd on
the understanding that it may not be copied, used, or disclosed to others except as authorised in writing by Tritech International Ltd.
Tritech International Ltd reserves the right to change, modify and update designs and specifications as part of their ongoing
product development programme.
All product names are trademarks of their respective companies.

Seanet SCU v5
0581-SOM-00002, Issue: 05 3 © Tritech International Ltd.
Table of Contents
Help & Support ........................................................................................................... 4
Warning Symbols ........................................................................................................ 5
1. Introduction ............................................................................................................. 6
2. Specification ........................................................................................................... 7
2.1. Dimensions .................................................................................................. 7
2.2. Computer and Electrical ............................................................................... 8
2.3. Physical ....................................................................................................... 8
2.4. SCUv5 Front Panel ...................................................................................... 9
2.5. Seanet SCU (v5) Rear Panel Layout ............................................................. 9
2.6. Major differences between SCUv4 and SCUv5 ............................................ 10
3. Installation ............................................................................................................ 12
3.1. Connections ............................................................................................... 12
3.2. Communication Configuration ..................................................................... 13
4. Operation .............................................................................................................. 15
5. System Software Configuration .............................................................................. 16
5.1. Seanet System Re-Installation .................................................................... 16
5.2. Repair of Seanet Pro .................................................................................. 16
5.3. Full Disk Re-Installation using Boot Recovery .............................................. 17
6. Maintenance ......................................................................................................... 18
A. Data and Control Ports ......................................................................................... 19
B. SCUv5 Communications Setup .............................................................................. 24
C. ARCNET Termination ........................................................................................... 29
D. Setting the computer IP address in Windows® 7 or Windows® 10 ........................... 30
Glossary ................................................................................................................... 32

Seanet SCU v5
0581-SOM-00002, Issue: 05 4 © Tritech International Ltd.
Help & Support
First please read this manual thoroughly (particularly the Troubleshooting section, if present).
If a warranty is applicable, further details can be found in the Warranty Statement, 0080-
STF-00139, available upon request.
Tritech International Ltd can be contacted as follows:
Mail Tritech International Ltd
Peregrine Road
Westhill Business Park
Westhill, Aberdeenshire
AB32 6JL, UK
Telephone ++44(0)1224 744 111
Fax ++44(0)1224 741 771
Email [email protected]
Website www.tritech.co.uk
Prior to contacting Tritech International Ltd please ensure that the following is available:
1. The Serial Numbers of the product and any Tritech International Ltd equipment connected
directly or indirectly to it
2. Software or firmware revision numbers
3. A clear fault description
4. Details of any remedial action implemented
Contamination
If the product has been used in a contaminated or hazardous environment you
must de-contaminate the product and report any hazards prior to returning the
unit for repair. Under no circumstances should a product be returned that is
contaminated with radioactive material.
The name of the organisation which purchased the system is held on record at Tritech
International Ltd and details of new software or hardware packages will be announced at
regular intervals. This manual may not detail every aspect of operation and for the latest
revision of the manual please refer to www.tritech.co.uk
Tritech International Ltd can only undertake to provide software support of systems loaded
with the software in accordance with the instructions given in this manual. It is the customer's
responsibility to ensure the compatibility of any other package they choose to use.

Seanet SCU v5
0581-SOM-00002, Issue: 05 5 © Tritech International Ltd.
Warning Symbols
Throughout this manual the following symbols may be used where applicable to denote any
particular hazards or areas which should be given special attention:
Note
This symbol highlights anything which would be of particular interest to the reader
or provides extra information outside of the current topic.
Important
When this is shown there is potential to cause harm to the device due to
static discharge. The components should not be handled without appropriate
protection to prevent such a discharge occurring.
Caution
This highlights areas where extra care is needed to ensure that certain delicate
components are not damaged.
Warning
DANGER OF INJURY TO SELF OR OTHERS
Where this symbol is present there is a serious risk of injury or loss of life. Care
should be taken to follow the instructions correctly and also conduct a separate
Risk Assessment prior to commencing work.

Seanet SCU v5
0581-SOM-00002, Issue: 05 6 © Tritech International Ltd.
1. Introduction
The Seanet Surface Control Unit SCU (v5) incorporates the very latest in electronics and PC
technology including readers for memory cards and a built-in factory restore mode. The latest
v5 model of the SCU has again been designed with reliability and robustness in mind. The
SCU is housed in a rugged 3U rack mount chassis and incorporates a front panel Remote
Access Terminal (RAT) which enables all functions to be controlled by a combination of
pointer and function button operations.
The Seanet SCU (v5) is designed to control and display the complete range of Tritech
International Ltd sonars and subsidiary subsea sensors,
Features:
• The SCU can simultaneously run combinations of (amongst others) Imaging Sonar,
Profiling Sonar, Bathymetric & Oceanographic package and Sidescan together
• Uses a fast ARCNET communications to the subsea devices allowing a standard data rate
of 156kbps (max cable length 1200m) with options for fibre-optic interfaces and other Baud
rates available for longer cable lengths
• Simultaneous connection and operation of Gemini heads via Ethernet
• Built-in factory restore disk, for simple diskless restoration to original settings, also contains
a minimum of 32GB SSD (10GB reserved for Operating System)
• Compact Flash and SD slot in front panel
• As well as data from Tritech devices, other data including NMEA 1083, Pipetracker, Turns
Counter and Compass data may be recorded
• A range of interface ports is provided including DA-15 ARCNET, USB, DE-9 serial and
Ethernet RJ45
• Data export capability via the 5 x DE-9 connectors using RS232, RS485 or RS422
• Rack-mountable in racks of depth 330mm or greater
Note
A range of factory fit options are available on request, such as video capture
cards, please contact Tritech International Ltd for more information.

Seanet SCU v5
0581-SOM-00002, Issue: 05 7 © Tritech International Ltd.
2. Specification
2.1. Dimensions
All dimensions are in mm. Not to scale.
375.5
432.4
482.6
325.0
132.5
465.9
57.2
All dimensions are in mm. Not to scale.

Specification Seanet SCU v5
0581-SOM-00002, Issue: 05 8 © Tritech International Ltd.
2.2. Computer and Electrical
Item Details
Processor Intel™ Dual Core (or better)
Operating System Microsoft Windows® Embedded
Primary Control PS/2 Remote Access Terminal (RAT)
Video Output SVGA, XGA, SXGA, and Display Port
HDMI and DVI available via Display Port adaptors
ARCNET Link 1 x 156kbit·s-1 (1200m) or 78kbit·s-1 (2500m)
Storage Media 64GB SSD
Interface Ports 4 x 9-pin DE-9 ports (configurable RS-232, RS-485, RS-422,
ARCNET)
1 x 15-pin DA-15 port for ARCNET or RS232
1 x 24VDC at 36VA Output (for equipment test purposes)
Front and rear USB ports (3.0 or better)
Multi-card reader (CF Type 1 & SD card)
Ethernet
Input Voltage Universal 100-240VAC 50/60Hz
Note
Any connectors on the motherboard are not part of the SCU specification and
may be used as part of the normal operation of the unit but their use is not
covered by this manual.
2.3. Physical
Item Details
Weight ~10kg
Material Aluminium, Stainless Steel
Operating Temperature 5 to 35°C
Storage Temperature -20 to 50°C

Specification Seanet SCU v5
0581-SOM-00002, Issue: 05 9 © Tritech International Ltd.
2.4. SCUv5 Front Panel
1. The RAT can be de-coupled from the main unit completely or operated from an RS232
extension cable. The function of the RAT controls depend on which subsea sensors are
fitted, and the user should refer to the appropriate section of each product manual for full
details.
2. The AUX Power Switch toggles the DC Voltage Output on the rear of the SCU. This DC
voltage is accessible on the DC OUT banana plugs on the rear.
3. The memory card reader is compatible with Compact Flash I/II and SD cards. The restore
disk on earlier Seanet SCUs is no longer used as there is an in-built factory restore option
for system recovery.
4. The port activity LEDs indicate the state and configuration of the DE-9 COM ports (A - D)
accessible on the rear
2.5. Seanet SCU (v5) Rear Panel Layout
1. Power supply with DC Out ports
2. Motherboard connectors
3. Expansion slots for PCI based cards (including PCI-E)
4. (from left to right) Earth mounting point, DE-9 (top row) and DA-15 (bottom row) ports for
RS232, RS422, RS485, ARCNET and RAT, system restore button

Specification Seanet SCU v5
0581-SOM-00002, Issue: 05 10 © Tritech International Ltd.
Note
The exact rear panel layout of the SCUv5 is subject to change and may not be
identical to the layout shown above.
For detailed pin-out diagrams and wiring options for the DE-9 and DA-15 connectors refer to
Appendix A, Data and Control Ports and Appendix B, SCUv5 Communications Setup.
Note
The motherboard connectors are subject to change in line with Tritech
International Ltd policy of continual product improvement, however, this will not
affect ordinary operation of the SCU. Generally the motherboard will have USB
ports (conforming to at least the USB2.0 standard), 1 or 2 PS/2 keyboard/mouse
ports and RJ45 Ethernet.
Caution
If a DE-9 port is present on the motherboard it may only work with RS232 signals
but is not fitted with over-current protection. To avoid potential damage to the
motherboard it is recommended that this port is not used to connect sensor
equipment. Contact Tritech International Ltd with details of your SCU if more
information or assistance is required.
2.6. Major differences between SCUv4 and SCUv5
Feature SCU (v4) SCU (v5)
RAM 256Mb 512Mb (minimum)
Data Storage Zip Drive, optional HDD SSD Drive, optional HDD
(instead of SSD)
ARCNET Sonar Ports 1 x AIF card interface 2 x SCU5 Main Board Ports
Serial Sonar Ports 3 x RS232 4 x RS232/RS485 or 2 x
RS422
USB Ports 2 front, 2 rear 4 front plus rear ports
ARCNET Ports PCI AIF, Node 255 V5 Main Board, Node 252
Ethernet LAN Port Optional Normally 1, more can be
added.
Port Activity LED Display No Yes
Aux Power Supply 24V 1A, non-switchable 24V 2.4A switchable, 33V
1.8A option, LED on warning
External Storage Floppy Disk Drive, ZIP Drive Compact Flash Card, SD
Card, Memory Stick
System Recovery Device ZIP Disk – stored internal to
SCU. SCU Lid needs to be
removed to access
Internal flash memory –
switched system restore. No
internal access required.
Caution
If a DE-9 port is present on the motherboard it may only work with RS232 signals
but is not fitted with over-current protection. To avoid potential damage to the

Specification Seanet SCU v5
0581-SOM-00002, Issue: 05 11 © Tritech International Ltd.
motherboard it is recommended that this port is not used to connect sensor
equipment. Contact Tritech International Ltd with details of your SCU if more
information or assistance is required.

Seanet SCU v5
0581-SOM-00002, Issue: 05 12 © Tritech International Ltd.
3. Installation
The Seanet SCU (v5) should be carefully removed from its transit case and checked to see
that the control unit is undamaged. The unit may be inverted to check for any parts that may
have been loosened during transit. If so, remove the unit cover and investigate further. The
unit should be firmly mounted in a clean dry installation such as a rack system.
If fitted in a confined space such as a rack, then an adequate supply of cool air should be
available to keep the unit from overheating. The front and back of the unit must have a clear
space for air venting, cooling and cable access. If the unit is mounted on a desk or bench,
then it should be secured against movement when powered on. Again leave space for air
circulation and cable access.
The SCU is supplied with the screen display and output and communications already
configured. The user should not have to change the screen display layout or comm’s set-up
unless it is not suited to their use (contact Tritech International Ltd for more details).
3.1. Connections
Caution
The power should be turned off before making a connection between the sonar
head and surface controller (SCU or SeaHub).
The SCU mains inlet should be connected to a fused (rated 5A) 100-240V 50/60Hz power
supply. The mains supply to the SCU must be clean, free of transient noise spikes and
interference, as suitable for computers and electrical instruments. If the mains supply is of a
dirty nature then a suitable filter or uninterruptible power supply (UPS) must be fitted. There is
an On/Off isolator switch at the rear of the unit and momentary soft power switch at the front.
The isolator switch must be ON before operating the front momentary soft power switch.
For the full connection details of the SCUv5 please refer to Appendix B, SCUv5
Communications Setup.
Connect the DVI port to a suitable digital display, or use the DVI to VGA adapter if connecting
a VGA computer screen. If the RAT is used remotely, use the extension lead supplied to
connect it to either the front of the Seanet SCU, or on the rear port marked RAT. As an
alternative to using the RAT a keyboard and mouse can be connected to the motherboard
PS/2 ports. Finally connect any sensor equipment to the serial ports, ARCNET or Ethernet
port.
Caution
COM1 does not have any ESD / Transient protection and so should not be used
for connection of serial Sensors and devices. Ports A – D are installed with
protection.
Before powering up the Seanet SCU check that the subsea heads are correctly connected,
check the data communication lines for shorts to other wires, and check the termination
resistance is correct at both ends.

Installation Seanet SCU v5
0581-SOM-00002, Issue: 05 13 © Tritech International Ltd.
3.2. Communication Configuration
Fitted inside the SCU, located at the front panel, is the SCUv5 Main Board. This is a multi-
purpose board that houses the bulk of the circuitry from the superseded AIF PCB. This
includes the ARCNET interface, for communications with the subsea sensor heads, and the
RAT interface. The Main Board is also populated with the Memory Card Reader, Port Status
LEDs and hardware for COM Ports A to D. The SCUv5 Main Board will appear in the Setup
table as Node 252 which replaces the Node 255 for the superseded AIF Card.
Full details of all the connections are contained in Appendix B, SCUv5 Communications
Setup. Normal communications with the subsea devices is via a customised version of the
ARCNET network system and requires a good quality balanced twisted pair cable.
An optional RS232 interface can be provided to allow telemetry connection through a fibre
optic system capable of 115kbit·s-1 transmission. The RS232 interface is available in the
guise of an RS232 to ARCNET converter PCB that is installed in a dry pod inside the
ROV. Alternatively, an intelligent 4000m pressure rated Junction Box will provide the RS232
interface to the network of SeaKing ARCNET devices.
Note
The SeaKing range of Subsea Sensors are designed to work from a smoothed
DC power supply of 20-72V DC (Absolute Maximum 72V DC) when fitted with a
COMV6 PCB. For more details, please contact Tritech International Ltd.
Caution
SeaKing units fitted with a COMV5 MOD A PCB, or earlier, have an operating
voltage range of either 18-28 VDC or 18-36 VDC. Please contact Tritech
International Ltd for more information and advice.
If using a rectified transformer PSU, the output of the PSU must have a filter capacitor of not
less than 470μF, for each head being powered. If an unregulated PSU is used, then make
sure that the voltage value measured at the head is in the range 20-72v DC, both in power off
and running conditions. If powering the head(s) down a long lead or umbilical, the maximum
recommended loop resistance of the power line must not exceed 10Ω for one head, 5Ω for
two heads, and 3Ω for three heads. If the supplied voltage is less than 20V DC the head
may not operate correctly.
Caution
Never try to make Tritech International Ltd sonar heads work down a long cable
by increasing the PSU output voltage above the recommended voltage.
For detail of the appropriate termination requirements for a Tritech International Ltd ARCNET
network please refer to Appendix C, ARCNET Termination
Use with Ethernet Sonars
The motherboard Ethernet port is capable of driving a single Ethernet device, such as a
Gemini imaging sonar or profiler, or it can be coupled to a network switch to enable multiple
sonars to be operated. A specially designed Gemini Hub unit is available from Tritech
International Ltd which enables multiple Gemini profilers and other sensors to be attached
through the Ethernet port.
Extra software may be required to operate the Ethernet sonars, please contact Tritech
International Ltd for more details.

Installation Seanet SCU v5
0581-SOM-00002, Issue: 05 14 © Tritech International Ltd.
Use with Serial Devices
The SCU is installed with four DE-9 ports on the rear panel for use with serial
communications. These ports can be configured for different standards and for survey data
output ports to a data logger or as ports where Tritech International Ltd or other 3rd party
sensors/devices can be connected.
Ports A to D can be configured to operate to different communication standards:
Port RS232 RS422 RS485 ARCNET
A YES NO YES NO
B YES YES YES NO
C YES NO YES YES
D YES NO YES YES
Caution
The internal motherboard DE-9 connector (if present) is not fitted with ESD
protection and so should not be used to connect sonar or sensor equipment.
Doing so might damage the motherboard of the SCU.
For a more complete listing of the ports and their capabilities (as well as pin-out diagrams)
please refer to Appendix A, Data and Control Ports

Seanet SCU v5
0581-SOM-00002, Issue: 05 15 © Tritech International Ltd.
4. Operation
Once a system has been installed in conjunction with the relevant sections of this manual and
any relevant sensor manuals, it can be tested in air by powering up the system and observing
that communications with the subsea device(s) is established.
Caution
The power should be turned off before making a connection between the sonar
head and surface controller (SCU or SeaHub).
When the SCU and subsea heads are switched on, the system display will appear on
the monitor after a few seconds delay. Until the SCU, Remote Access Terminal (RAT),
and Subsea elements are communicating correctly, the Status Bar will display a Timeout
(‘Timeout Node xx’) message for each Node that it is trying to communicate with. These
messages will be removed from the display as each subsea device is detected as operating
correctly.
If the RAT or subsea elements are not powered up, not present, or have a fault somewhere,
then error messages will be shown in the status bar boxes on the bottom of the display. If
error messages appear, check that all the system parts are connected and that all leads/
cables are correctly installed.
The following sections of this manual will describe the general software controls in addition
to installation and connection instructions. Further, separate manual sections will describe
operation of each of the subsea Sensors and their connection details.
Full details of the Seanet Pro and Seanet Setup operation can be found in the Seanet Pro
Software Manual. There are also a number of devices that can be connected to the Seanet
SCU including Imaging Sonar, Profiler, Bathymetric and Sidescan. Refer to the individual
device manual for specific details of their screen controls and functions.
Note
The four DE-9 ports are labelled as ScuA to ScuD in Seanet Setup. These are
assigned virtual port numbering in Windows®. Two other ports will be shown,
ScuMain and ScuAux - these are used for communication inside the SCU and
not for external devices.
The port numbering will be re-set if a system restore is performed and due to the manner in
which Windows® manages resources the ports may be numbered differently each time the
system is restored. If desired they can be manually re-assigned from the Windows® Control
Panel.
Setting COM Ports
1. From within the Control Panel select System & Security
2. Select the System button
3. Click on Device Manager in the left-hand pane
4. Under Ports (COM & LPT) select the port to be changed and right click on it and select
Properties
5. Navigate to the Port Settings tab and then click the Advanced button and from here
it is possible to change the port number to one that had not yet been assigned

Seanet SCU v5
0581-SOM-00002, Issue: 05 16 © Tritech International Ltd.
5. System Software Configuration
Your system will be delivered with Microsoft Windows® Embedded and Seanet System
Software pre-installed.
A complete image of the Microsoft Windows® Embedded Operating System is provided on
an internal flash memory device. This is independent from the primary C:\ partition where
the system software is installed to. This image can be re-installed at any time through a boot
recovery process to restore the primary C:\ partition to a factory default state.
The boot recovery process is initiated via a switch on the rear panel of the SCU. Files on the
C:\ partition are re-installed during the recovery process, leaving user files on the D:\ drive
unaffected.
There are 2 levels of restoration that can be carried out:
1. Re-installation of the Seanet Pro software only to factory default. It is recommended where
possible that this is attempted before level 2 in order to recover the SCU.
2. Complete re-installation of the primary C:\ partition to factory supplied condition. Use of
this level will erase all files currently stored on the C:\ drive and replace with a factory
installation state. D:\ drive user files will be unaffected. The D:\ drive is also where a copy
of the Seanet Pro software installer and manuals can be located.
5.1. Seanet System Re-Installation
The Seanet SCU has the following drive letters:
Drive C:\ Primary, flash memory boot drive where system files and Seanet Pro software
are installed. This drive should NOT be used for storing any log files.
Drive D:\ This drive is where the Seanet Pro software installer and operator manuals
can be found. There is space to use this drive for user files and log files. The
‘My Documents’ folder has also been moved to this drive.
5.2. Repair of Seanet Pro
If the Seanet SCUv5 is booting up normally and only the Seanet Pro software is giving a
problem then, as a first level recovery, the Seanet Pro software can be re-installed from the
D:\ drive.
Before re-installing Seanet Pro, it is advisable to first remove the existing Seanet Pro
installation. This can be performed through Control Panel – Programs and Features.
Select the Seanet Pro entry and then follow the on-screen instructions to remove the
program.
For re-installation browse to the D:\SeaNet Installer folder and run SCU5Setup.exe
and follow the installation prompts throughout. After installation is complete, click on the
Finish button which will reboot the SCU ready to run Seanet Pro on Microsoft Windows®
re-start.

System Software Configuration Seanet SCU v5
0581-SOM-00002, Issue: 05 17 © Tritech International Ltd.
5.3. Full Disk Re-Installation using Boot Recovery
If any part of the Microsoft Windows® operating system becomes corrupt and requires re-
installing, the original factory configuration can be restored from a backup image of the
primary disk that is retained on internal flash memory. Refer to the following steps for
guidance:
1. With keyboard connected and SCU powered down, power on the SCU and immediately
press and release the System Restore button located on the rear of the SCU.
2. When the BIOS POST message is displayed after power up, press the <F8>, <F11> or
<F12> button on the keyboard (note: this button can very depending on the motherboard
fitted - if in doubt watch the screen during boot-up and select the appropriate button to get
to the "boot" menu). This will start the SCU with the boot selection screen.
3. On this screen will be listed the boot device options which will vary depending on the SCU
version:
•PRETEC 01GB USB DOF (early SCUv5 units)
•USB Disk module PMAP (later Microsoft Windows® XP SCUv5 units)
•USB-HDD (for Microsoft Windows® 7 SCUv5 units)
Select the correct device and press <Enter> on the keyboard.
4. The Microsoft Windows® Startup Menu will soon appear.
• For Microsoft Windows® XP units the user should select Option 1 Restore System
Disk to Factory Defaults, press <Enter> on the keyboard and then press
the <Y> key to confirm disk restore.
• For Microsoft Windows® 7 units the option is labelled as "A" and Restore Hard Disk
to Factory Defaults, so button <A> should be pressed and then the <Enter> key.
5. The system retore will start and when it is complete a notification to press the reset button
on the front of SCU appears. At this point, press the Reset button to reboot the SCU.
6. ( Microsoft Windows® XP only) On reboot, notification will be displayed that the machine
is resealed, click the OK button at this point to reboot the SCU once more.
7. ( Microsoft Windows® XP only) Once rebooted, Microsoft Windows® will restart and a
‘Log On to Windows’ box will appear. Click OK to proceed past this.
8. A prompt will then appear to install Seanet Pro. Click on OK to proceed with this and follow
the instructions given during the installation process.
9. Once Seanet Pro installation is complete, click Finish which will restart the SCU for a
final time. The restore operation is now complete.
Note
If this device is not listed then you will need to reboot once more following
the above steps – it is important that the System Restore button is pressed
immediately after power on as this engages the flash memory where the backup
image is held.

Seanet SCU v5
0581-SOM-00002, Issue: 05 18 © Tritech International Ltd.
6. Maintenance
There are few user-serviceable parts inside the Seanet SCU (v5) that can be checked and/
or replaced.
Firstly, it is recommended that the unit be used in a clean, well ventilated and dust-free
environment. Also, operating in extreme temperature and humidity should be avoided if
possible. The environmental temperature should be between 5 to 35°C.
ESD / Transient Protection (COM Port A - D )
Note
The onboard motherboard COM1 is not fitted with any isolation or surge
protection and so should only be used as a data logger output port and NOT
used for Sensor interfacing.
The multi-purpose Ports A - D are installed with electrical surge protection. These elements
are fitted on the SCU V5 Main Board which is located inside the SCU at the front. If the COM
Ports A through D are subjected to very high electrostatic noise or transients, the protective
elements on this PCB would blow / open-circuit and therefore protect the serial UART that
is installed on the main board.
If in the unlikely event the protection does blow on the PCB then the user has a number of
options open to themselves:
1. Replace the SCUv5 Main Board PCB with a spare if carried. Contact Tritech or a local
agent who will supply this PCB.
2. Replace the blown protective elements / components on the PCB. This would obviously
require some diagnosing and know-how on the part of the user.
3. Mark or label the failed port as inoperative and continue to use the remaining available
Ports until such time as the faulty Port can be repaired.
Front Air Inlet Filter
It is recommended that this filter be replaced annually although a replacement may be
required sooner if operating the unit in a particularly dirty environment.
Note
The Tritech Part number of the air filter is S05023.

Seanet SCU v5
0581-SOM-00002, Issue: 05 19 © Tritech International Ltd.
Appendix A. Data and Control Ports
Waterblock Pin-out Diagram
1
4
6
2
35
Tritech Waterblock
Pin MAIN port AUX port Cable colour
1
RS232 TX
ARCNET A
RS485 A
RS232 RX
ARCNET A
RS485 A
Yellow
2
RS232 RX
ARCNET B
RS485 B
RS232 TX
ARCNET B
RS485 B
Blue
3 +DC Power Red
4 -DC Power Black
5 RS232 Ground Green
6 Earth/cable shield cable screen
On the SCU a range of interface ports is provided, arranged as follows:
Location Port Type Number provided
USB 2.0 4Front Panel
RAT Interface 1
Sonar/Sensor/Serial Interface 4
RAT Interface 1
ARCNET Link 2
Rear Panel
SVGA, XGA, SXGA 1
Notes:
1. 500mA current capacity per USB port
2. Sonar/Sensor Serial ports are software selectable up to 4 x RS-232, up to 4 x RS-485,
2 x ARCNET, 1 x RS-422.
3. The ARCNET Link provides a long distance communications link to other Tritech
International Ltd instruments. It is software configurable (using Seanet) to operate up to
1500m cable (156kbps) or 2500m (78kbs).
4. The SVGA, XGA, SXGA port is a 15w High Density D, analogue; DVI (Digital Video
Interface)
5. Motherboard ports are subject to change and are not part of this specification.
Comms Status and Data Activity LEDs (Ports A – D)
The layout of the Communication Port COMMS status and data activity LED’s is shown below.

Data and Control Ports Seanet SCU v5
0581-SOM-00002, Issue: 05 20 © Tritech International Ltd.
The COMMS row of LEDs are bi-colour, with Red - Receive; Green - Transmit
The remaining LEDs are Blue, indicating the communications protocol which has been
software selected for a particular port.
If working in reduced lighting conditions, the overall brightness of the status indicators may
be controlled through the “Seanet Setup” configuration interface for the SCU.
Port A Details
All signals are fully isolated and voltage transient protected with respect to the
communications power supply. The modes are software selectable. When used in RS-232
mode, the pin out of this port is wired in the same way as a PC serial “COM” port (i.e. using
DTE signal directions), and compatible with any standard RS-232 peripherals and cabling.
Supports data transfer rates of up to 115200 baud.
PORT A
45
1 2
8
6
3
7 9
SCU DE-9 male connector
Pin RS232 RS485
1 ‡ ‡
2 RX TX/RX.A
3 TX TX/RX.B
4 ‡ ‡
5 GROUND GROUND
6 ‡ ‡
7 RTS ‡
8 CTS ‡
9 ‡ ‡
‡ = connected for handshaking only.
Note
Port A will also work as a 3-wire RS232 connection without RTS and CTS. Pin
7 and 8 maintain signal levels of +/-12V for both 3-wire RS232 and RS485
Port B Details
All signals are fully isolated and voltage transient protected with respect to the
communications power supply.