SRT Marine Systems plc SRT-MTB-OEM User Manual
SRT Marine
Instruction Manual
LD2103 V2.8 Page 1 of 36
SRT-MTB© Marine Automatic Identification System
SRT Marine
Instruction Manual
SRT-MTB© Class B Marine AIS
Table of contents
LD2103 V2.8 Page 2 of 36
Table of contents ............................................................................................................................................................................2
General Warnings.......................................................................................................................................................................4
Licensing.....................................................................................................................................................................................5
Product Specification ..................................................................................................................................................................6
Standards ...................................................................................................................................................................................7
Declaration of Conformity ...........................................................................................................................................................7
Introduction .....................................................................................................................................................................................8
How AIS Works...........................................................................................................................................................................8
AIS Classes ................................................................................................................................................................................8
Position Information Source........................................................................................................................................................8
Installing the SRT-MTB unit ............................................................................................................................................................9
Electrical Connections ................................................................................................................................................................9
Physical Mounting.....................................................................................................................................................................10
Programming the transponder ......................................................................................................................................................11
Programming the transponder ......................................................................................................................................................11
Field Programmer .....................................................................................................................................................................11
Data Creation............................................................................................................................................................................11
Other Features..........................................................................................................................................................................12
Using the Transponder .................................................................................................................................................................13
Switching On.................................................................................................................................................................................13
Warning and Fault States .............................................................................................................................................................13
Data Port Messages .................................................................................................................................................................13
Information Transmitted and Received .....................................................................................................................................14
Built In Test...............................................................................................................................................................................14
LED Indicators ..........................................................................................................................................................................15
Maintenance .............................................................................................................................................................................16
Serial Data Interface .....................................................................................................................................................................17
Power Connection / Data Connection.......................................................................................................................................17
Serial Port Input/Output ............................................................................................................................................................17
Power up Messages .................................................................................................................................................................18
SRT Marine
Instruction Manual
SRT-MTB© Class B Marine AIS
LD2103 V2.8 Page 3 of 36
VHF Data Link Messages (NMEA 0183 VDM)..........................................................................................................................18
VHF Data Link Own Vessel Messages (NMEA 0183 VDO)......................................................................................................19
Regional Assignment Channel Assignment Message (NMEA 0183 ACA)................................................................................20
Channel Management Information Source Messages (NMEA 0183 ACS) ...............................................................................20
AIS Alarm Messages (NMEA 0183 ALR, Text).........................................................................................................................21
ACK Messages .........................................................................................................................................................................21
Antenna Connections ...................................................................................................................................................................22
GPS Antenna............................................................................................................................................................................22
VHF Antenna ............................................................................................................................................................................22
Antenna Types and Mounting ...................................................................................................................................................22
Drawings.......................................................................................................................................................................................23
Packing List ..............................................................................................................................................................................23
Block Schematics – Baseband Block Diagram .........................................................................................................................31
Appendix A ...................................................................................................................................................................................34
Antennas and Antenna Mounting..................................................................................................................................................34
GPS Antenna............................................................................................................................................................................34
VHF Antenna for AIS Use .........................................................................................................................................................34
Warnings...................................................................................................................................................................................35
LD2103 V2.8 Page 4 of 36
SRT Marine
Instruction Manual
SRT-MTB© Class B Marine AIS
General Warnings
All marine Automatic Identification System (AIS) units utilise a satellite based system such as the Global Positioning Satellite
(GPS) network or the Global Navigation Satellite System (GLONASS) network to determine position.
The accuracy of these networks is variable and is affected by factors such as the antenna positioning, how many satellites are
used to determine a position and how long satellite information has been received for.
It is desirable wherever possible therefore to verify both your vessels AIS derived position data and other vessels AIS derived
position data with visual or radar based observations.
The compass safe distance of this unit is 0.5m or greater for 0.3° deviation.
FCC Compliance
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the
FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation.
This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the
instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not
occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be
determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the
following measures:
Reorient or relocate the receiving antenna.
•
Increase the separation between the equipment and receiver.
•
Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
•
Consult the dealer or an experienced radio/TV technician for help.
•
The SRT-MTB-OEM does not contain any user serviceable parts. Repairs should only be made by an authorized SRT service
agent. Unauthorised repairs or modifications could result in permanent damage to the equipment and void your warranty and
you’re authority to operate this equipment under Part 15 regulations.
RF Emissions Notice
This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. This device’s antenna
must be installed in accordance with provided instructions; and it must be operated with minimum 96 cm spacing between the
antennas and all persons body (excluding extremities of hands, wrist and feet) during operation. Further, this transmitter must
not be co-located or operated in conjunction with any other antenna or transmitter.
LD2103 V2.8 Page 5 of 36
SRT Marine
Instruction Manual
SRT-MTB© Class B Marine AIS
Licensing
IMPORTANT: In most countries the operation of an AIS unit is included under the vessel's marine VHF licence provisions. The
vessel on to which the AIS unit is to installed must therefore possess a current VHF radiotelephone licence which lists the AIS
system and the vessel Call Sign and MMSI number.
Please contact the relevant authority in your country for more information.
In accordance with a policy of continual development and product improvement the SRT-MTB hardware and software may be
upgraded from time to time and future versions of the SRT-MTB may therefore not correspond exactly with this manual.
When necessary upgrades to the product will be accompanied by updates or addenda to this manual.
Please take time to read this manual carefully and to understand its contents fully so that you can install and operate your AIS
system correctly.
Information contained in this manual is liable to change without notice.
Software Radio Technology plc disclaims any liability for consequences arising from omissions or inaccuracies in this manual
and any other documentation provided with this product.
© 2007 Software Radio Technology plc.
SRT Marine
Instruction Manual
SRT-MTB© Class B Marine AIS
Product Specification
Parameter Value
Dimensions 190 x 135 x 83 mm (L x W x H)
Weight 1450g
Power DC (9.6-15.6V)
Average power consumption 4W
Peak current rating 2A
GPS Receiver (AIS Internal) IEC 61108-1 compliant
LD2103 V2.8 Page 6 of 36
Electrical Interfaces RS232 38.4kBaud bi-directional
RS422 NMEA 38.4kBaud bi-directional
Connectors VHF antenna connector
GPS antenna connector
RS232/RS422/Power
VHF Transceiver Transmitter x 1
Receiver x 2 (One receiver time shared between AIS and DSC)
Frequency: 156.025 to 162.025 MHz in 25 kHz steps
Output Power 33dBm ± 1.5 dB
Channel Bandwidth 25kHz
Channel Step 25kHz
Modulation Modes 25kHz GMSK (AIS, TX and RX)
25kHz AFSK (DSC, RX only)
Bit rate 9600 b/s ± 50 ppm (GMSK)
1200 b/s ± 30 ppm (FSK)
RX Sensitivity Sensitivity - 107dBm 25kHz (Message Error Rate 20%)
Co-channel 10dB
Adjacent channel 70dB
IMD 65dB
Blocking 84dB
Environmental IEC 60945
Operating temperature: -25ºC to +55ºC
IEC 62287, Section 5, Cat c) exposed to the weather
LD2103 V2.8 Page 7 of 36
SRT Marine
Instruction Manual
SRT-MTB© Class B Marine AIS
Parameter Value
Indicators Power, TX timeout, status, pre-set SRM sent.
Operator Controls Optional pre-set safety related message (SRM) transmit button
Standards
This product complies to all the necessary standards under the European R&TTE directive for Article 3.1(a), 3.1(b), 3.2 and
3.3(e). The following standards have been followed in pursuance of this:
IEC62287-1: 2006-03 Maritime navigation and radiocommunication equipment and systems – Class B shipborne
•
equipment of the automatic identification system (AIS) – Part 1: Carrier-sense time division multiple access (CSTDMA)
techniques
IEC60945: 2002-08 Maritime navigation and radiocommunication equipment and systems – General requirements –
•
Methods of testing and required test results
IEC61162-1: Maritime navigation and radiocommunication equipment and systems – Digital interfaces – Part 1: Single
•
talker and multiple listeners
IEC61108-1: GLOBAL NAVIGATION SATELLITE SYSTEMS (GNSS) – Part 1: Global positioning system (GPS) -
•
Receiver equipment - Performance standards, methods of testing and required test results
EN 301 843-1 v2.1: Electromagnetic compatibility and Radio spectrum Matters (ERM); Electromagnetic Compatibility
•
(EMC) standard for marine radio equipment and services; Part 1: Common technical requirements
EN 50383: 2002 Basic standard for calculation and measurement of electromagnetic field strength and SAR related to
•
human exposure from radio base stations and fixed terminal stations for wireless telecommunications system (110MHz
– 40GHz)
EN60950-1:2002 Information technology equipment – Safety – Part 1: General requirements
•
Declaration of Conformity
Software Radio Technology plc declares that this product is in compliance with the essential requirements and other provisions
of the R&TTE directive 1995/5/EC.
The product carries the CE mark, notified body number and alert symbol as required by the R&TTE directive
The product is intended for sale in the following member states:
LD2103 V2.8 Page 8 of 36
SRT Marine
Instruction Manual
SRT-MTB© Class B Marine AIS
Introduction
How AIS Works
The marine Automatic Identification System (AIS) is a location and vessel information reporting system. It allows vessels
equipped with AIS to automatically and dynamically share and regularly update their position, speed, course and other
information such as vessel identity with similarly equipped craft. Position is derived from a Global Navigation Satellite System
(GNSS) network and communication between vessels is by Very High Frequency (VHF) digital transmissions. A sophisticated
and automatic method of time sharing the radio channel is used to ensure that even where a large number of vessels are in one
location blocking of individual transmissions is minimised, any degradation of the expected position reporting interval is
indicated to the user and even if the unit suffers extreme channel overload conditions it will always recover to normal operation.
AIS Classes
There are two classes of AIS unit fitted to vessels, Class A and Class B. In addition AIS base stations may be employed by the
Coastguard, port authorities and other authorised bodies. AIS units acting as aids to navigation (A to Ns) can also be fitted to
fixed and floating navigation markers such as channel markers and buoys.
Class A units are a mandatory fit under the safety of life at sea (SOLAS) convention to vessels above 300 gross tons or which
carry more than 11 passengers in International waters. Many other commercial vessels and some leisure craft also fit Class A
units.
Class B units are currently not a mandatory fit but authorities in several parts of the world are considering this. Class B units are
designed for fitting in vessels which do not fall into the mandatory Class A fit category.
The SRT - MTB is a Class B unit
Position Information Source
As noted above the marine AIS system uses position information derived from networks such as the Global Positioning Satellite
(GPS) or the Global Navigation Satellite System (GLONASS) in order to determine the location of the AIS unit and thus the
vessel to which it is fitted.
The SRT- MTB utilises the GPS satellite network.
LD2103 V2.8 Page 9 of 36
Power Cable (or Power and Data Cable)
SRT Marine
Instruction Manual
SRT-MTB© Class B Marine AIS
Installing the SRT-MTB unit
WARNING: Do not connect the SRT-MTB unit to a mains (line) AC electrical supply, as an electric shock or fire hazard
could result.
CAUTION: Do not connect the SRT-MTB unit to a DC supply exceeding 15.6 V or reverse the supply polarity. Damage to
the unit may result.
CAUTION: The SRT-MTB unit is designed for operation in the temperature range -25 °C to +55 °C. Do not install (or use)
the SRT-MTB unit in environments which exceed this range.
CAUTION: Do not install the SRT-MTB unit in an environment where it can be subject to excessive exposure to water.
Electrical connections
Warning: Only the RF, data and power cables
provided with the SRT-MTB unit should be
used to connect antennas, power and display
devices so as to maintain the integrity of the
enclosure.
Please see the drawings section of this manual
for details of the power, data and RF cables
supplied.
Remove the top of the transponder unit (eight
screws) as shown.
Using the two co-axial leads supplied connect
the down-lead from a VHF antenna to the VHF
antenna port and connect the down-lead of a
GPS antenna to the GPS antenna port. Please
see Appendix A for recommendations on
antennas and antenna installation.
If an external display unit (chart plotter, PC etc)
is to be used connect the supplied power and
data interface cable to the Power / NMEA port.
GPS Antenna Cable
VHF Antenna Cable
If an external display unit is not to be used
connect the supplied power only interface cable
to the Power / NMEA port.
Locate the RF, power and/or data cables into
the rubber grommets pushing them firmly to the
base of each slit. Each cable is pushed into the
grommet slit which lies directly in front of the
connector the cable is connected to.
Replace the top of the transponder unit taking care to seat the cable grommets and the lid seal correctly. Do not over-tighten the
fixing screws.
LD2103 V2.8 Page 10 of 36
SRT Marine
Instruction Manual
SRT-MTB© Class B Marine AIS
If an external display unit is to be used (such as a chart plotter, PC serial terminal or other display device) connect the user end
of the data interface cable to the display device. Note that the software in the display device must be configured for AIS
operation AND to accept standard Class B operation NMEA sentences. This external display unit software is not part of the
SRT-MTB transponder package.
Connect a 12V DC supply (9.6-15.6V) capable of supplying 2A peak to the DC power lead (brown/red = positive,
black/blue=negative).
The case of the unit is not isolated from the negative terminal of the supply and therefore it is recommended that the
unit is not attached to metal parts of the vessel.
Physical Mounting
It is recommended that the unit is attached to a solid wooden surface with 20mm M3 self tapping screws. A template for drilling
pilot holes is shown on page 24.
LD2103 V2.8 Page 11 of 36
SRT Marine
Instruction Manual
SRT-MTB© Class B Marine AIS
Programming the transponder
Field Programmer
Before the SRT-MTB can be used it requires ‘personalisation’.
This is done via the SRT-MTB proAIS package which is supplied as an accessory.
This software is designed to be installed on a PC and to use the data lead provided as standard with the SRT-MTB unit. If the
PC being used for programming does not have a 9-pin serial port then a commercially available USB to serial adaptor may be
required. This connects between the supplied data lead and the PC.
The programming process operates as follows:
A data record is created for an individual SRT-MTB.
•
If required this data record is then edited.
•
The data record is saved to a data base.
•
The SRT-MTB unit is then programmed.
•
If required the programming can then be checked by ‘reading’ the SRT-MTB.
•
Data Creation
The SRT-MTB personalisation data required is the ship’s MMSI, the ship’s name, its dimensions, position reference, type and
call sign. The Date Entry function is accessible via the dealer and engineer passwords and personalisation data can be created
as follows.
Direct Entry By entering the ship’s MMSI, the ship’s name, its dimensions, position reference, type and call sign
directly into the programming software.
Read Existing Data By reading an already programmed MMSI, ship’s name, its dimensions, position reference, type and
call sign.
Read Database By reading from a previously created record in the data base the ship’s MMSI, the ship’s name, its
dimensions, position reference, type and call sign.
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