Tritech Micron Modem Manuel utilisateur
Micron Modem
0630-SOM-00001, Issue: 01 1© Tritech International Ltd.
Micron Modem
Product Manual
0630-SOM-00001, Issue: 01
Micron Modem
0630-SOM-00001, Issue: 01 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.
Micron Modem
0630-SOM-00001, Issue: 01 3© Tritech International Ltd.
Table of Contents
Help & Support ........................................................................................................ 4
Warning Symbols ..................................................................................................... 5
1. Introduction .......................................................................................................... 6
2. Specification ........................................................................................................ 7
2.1. Dimensions Diagram ................................................................................ 7
2.2. Acoustic .................................................................................................... 7
2.3. Electrical and Communication ................................................................. 7
2.4. Physical ..................................................................................................... 8
2.5. Pin-out Diagram & Cable Specification ................................................... 8
3. Installation ............................................................................................................ 9
3.1. Mounting ................................................................................................... 9
3.2. Handling .................................................................................................... 9
3.3. Power ...................................................................................................... 10
3.4. Communication Protocol ........................................................................ 10
3.5. Port Layout ............................................................................................. 10
4. Operation ............................................................................................................ 12
4.1. Software .................................................................................................. 12
4.2. Integration Considerations ...................................................................... 12
4.3. Transmission Characteristics .................................................................. 13
5. Configuration ..................................................................................................... 15
5.1. Enabling Setup Mode ............................................................................. 15
5.2. Modem Configuration Window .............................................................. 16
6. Maintenance ....................................................................................................... 18
A. Testing with HyperTerminal or Docklight ....................................................... 19
B. CHIRP Signal Processing ................................................................................. 24
Glossary .................................................................................................................. 26
Micron Modem
0630-SOM-00001, Issue: 01 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 a Warranty
Statement at the end of the manual.
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.
Micron Modem
0630-SOM-00001, Issue: 01 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.
Micron Modem
0630-SOM-00001, Issue: 01 6© Tritech International Ltd.
1. Introduction
The Tritech International Ltd Micron Data Modem provides a means of transferring
data acoustically through water. Operation is point to point, between a pair of
Micron Data Modems, at operational distances of up to 500m horizontally and 150m
vertically at a data rate of 40 bits per second.
Devices are addressed through a serial electrical interface, which may be controlled
directly from a personal computer with a simple teletype (half-duplex) terminal
program.
Spread Spectrum Technology
The quality of acoustic data transmission in water using conventional single
frequency systems suffers considerably from multi-path phenomena. Sound
transmitted from the sending modem arrives at the receiving unit via the direct path,
and via a series of secondary paths, due to reflections from the sea surface and sea
bottom. This can often result in the loss or corruption of transmitted data.
In addition, conventional systems have poor immunity to the continuously varying
background sea noise (such as wave noise).
Tritech Spread Spectrum technology however does not concentrate the acoustic
energy in one waveband, but produces a transmission which is linearly varied between
20kHz and 24kHz (known as a CHIRP waveform). By correlating the received
signals with the CHIRP waveform it is possible to achieve superior performance in
challenging multi-path environments.
In addition, identification of a unique transmission signature allows signals to be
detected in extremely noisy conditions, to the extent that communication is successful
even when the signal to noise ratio is as low as -6dB. This means that data streams can
be successfully detected which are considerably below the background noise level.
Micron Modem
0630-SOM-00001, Issue: 01 7© Tritech International Ltd.
2. Specification
2.1. Dimensions Diagram
79
Ø50
56
68
Ø56
Not to scale, dimensions in mm.
2.2. Acoustic
Frequency band 20 - 28kHz
Data rate 40bit·s-1 (spread spectrum)
Range 500m horizontal, 150m vertical
Transmitter source 169dB re 1μPa at 1m
Doppler tolerance ±5m·s-1
Minimum signal to noise ratio -6dB (in band)
Multipath rejection Maximum delay spread of 10 - 100ms
Ranging Integral range function with 0.1m resolution
over full range and ±0.2m accuracy
(assuming correct velocity of sound)
2.3. Electrical and Communication
Communications protocol RS232 or RS485
Power supply 12 - 24V DC
Power consumption 7.92W (330mA at 24V) transmitting
0.72W (30mA at 24V) receiving
Specification Micron Modem
0630-SOM-00001, Issue: 01 8© Tritech International Ltd.
2.4. Physical
Weight in air 235g
Weight in water 80g
Depth rating 750m
Temperature range -10 to 35°C (-20 to 50°C in storage)
2.5. Pin-out Diagram & Cable Specification
Caution
The Micron series connector is not wet mateable and direct exposure to
water when the unit is powered will cause damage.
Pin Wire Colour Function
1 Yellow RS485 A (-)
RS232 TX
2 Blue RS485 B (+)
RS232 RX
3 Red DC +
4 Black DC ground
5 Green RS232 ground
6 cable sheath earth
Micron Modem
0630-SOM-00001, Issue: 01 9© Tritech International Ltd.
3. Installation
3.1. Mounting
Orientation of the Micron Data Modem will normally be in the vertical position with
the transducer uppermost. The transducer is omni-directional.
Four tapped holes in the aluminium body are provided by the bottom of the Micron
Modem to permit mounting on flat surfaces, alternatively the Modem may be gently
gripped by a 50mm diameter clamping mechanism around the bottom part of the
housing.
Caution
It is recommended that any fixing screws used should be of a non-metallic
material to reduce the risk of corrosion around the fixing positions.
All dimensions are in millimetres.
Figure 3.1. Mounting Holes on Micron Range
3.2. Handling
The Micron Data Modem is a sealed product and under no circumstances should it be
opened or tampered with in any way. There are no user-serviceable parts or internal
switches which would necessitate disassembly.
The connector socket is not usable "open face" and should always be sealed wither
with a connector plug or the blanking plug provided. The auxiliary port should be
blanked off at all times when not in use.
Installation Micron Modem
0630-SOM-00001, Issue: 01 10 © Tritech International Ltd.
3.3. Power
The Micron Data Modem should be powered from a clean DC supply or battery pack.
To reduce damage to the device in the event of over-voltage it is recommended that
an appropriate fuse is included in the power supply connection.
For full details of the power requirement refer to Chapter 2, Specification.
3.4. Communication Protocol
The Micron Data Modem is supplied with two communications ports labelled MAIN
and AUX (short for auxiliary). All communication to the control computer on the
surface should be via the MAIN port.
The communication protocols used by the ports are factory set and are not user
selectable other than at the time of build.
• The RS232 telemetry is bi-directional, 3-wire (TX, RX and ground) between the
data modem and the controlling serial port.
• The RS485 telemetry is half-duplex, 2-wire (RS485+ and RS485-). Typically the
controlling RS485 connection can be an RS485 serial port installed in a computer
or can be an RS485 to RS232/USB signal converter. The RS485 circuit inside the
Micron Modem is factory supplied with a 150Ω termination.
A pair of Micron Data Modems can be connected between two serial devices in order
to transfer data between them acoustically.
For pin-out and cable specification refer to Chapter 2, Specification
3.5. Port Layout
The Micron Modem is supplied with two communications ports labelled MAIN and
AUX. All communication to the control computer on the surface should be via the
MAIN port, while the AUX port is used for daisy chained communication links to other
Tritech International Ltd sensors, such as the Micron Echosounder.
The communication configuration of the ports are factory set. The factory setting is
written on the label attached to the Micron, and can also be obtained from the original
build record.
Any combination of protocols (RS232 and RS485 only) are possible and Tritech
International Ltd use the letters A to D to denote the factory settings:
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