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Summary of Contents for Tritech Micron Modem
- Page 1 Micron Modem Micron Modem Product Manual 0630-SOM-00001, Issue: 01 0630-SOM-00001, Issue: 01 © Tritech International Ltd.
- Page 2 © 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.
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Page 3: Table Of Contents
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 0630-SOM-00001, Issue: 01 © Tritech International Ltd. -
Page 4: Help & Support
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. -
Page 5: Warning Symbols
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. 0630-SOM-00001, Issue: 01 © Tritech International Ltd. -
Page 6: Introduction
Micron Modem 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. -
Page 7: Specification
±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 0630-SOM-00001, Issue: 01 © Tritech International Ltd. -
Page 8: Physical
Wire Colour Function Yellow RS485 A (-) RS232 TX Blue RS485 B (+) RS232 RX DC + Black DC ground Green RS232 ground cable sheath earth 0630-SOM-00001, Issue: 01 © Tritech International Ltd. -
Page 9: Installation
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. 0630-SOM-00001, Issue: 01 © Tritech International Ltd. -
Page 10: Power
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. - Page 11 RS485 RS485 RS232 RS232 RS232 Note If the settings are changed through software it is important to keep a record of the changes, otherwise it can be difficult to re-connect to the modem. 0630-SOM-00001, Issue: 01 © Tritech International Ltd.
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Page 12: Operation
Micron Modem 4. Operation 4.1. Software Tritech International Ltd does not supply the Micron Data Modem with specific operating software. Seanet Pro software is required should any modem re- configuration be required (refer to Chapter 5, Configuration). Any terminal software may be used to operate and test a pair of data modems,... -
Page 13: Transmission Characteristics
Control of the Micron Modem must be handled by the connected computer or hardware. • Error checking and data quality is not provided by the Micron Modem. Any error in transmission will not be detected by the Modem and the Modem will not attempt re-transmission of the same data should it not be received correctly by the receiving Modem. - Page 14 Operation Micron Modem • Ambient noise • Salinity • Volume reverberation • Surface and seabed reflectivity • Significant Doppler shifts present, due to the relative movement between two communicating Modems. 0630-SOM-00001, Issue: 01 © Tritech International Ltd.
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Page 15: Configuration
Seanet Setup node table and should be labelled as MINIMODEM. From here it is possible to select Setup from the Action column to enable the setup mode for the Micron Modem. This is illustrated in Figure 5.2, “Enter Micron Modem Setup”. -
Page 16: Modem Configuration Window
5.2. Modem Configuration Window From the node table in Seanet Setup select Setup from the action column of the row which shows the Micron Modem. This will bring up the AM100ModemCfgSetup dialog as shown in Figure 5.3, “Micron Modem Configuration”. - Page 17 3. Press OK on the AM100ModemCfgSetup dialog and the changes made will be programmed into the modem. Note Any parameters not listed above are not effective at present and should not be selected or changed from the factory defaults. 0630-SOM-00001, Issue: 01 © Tritech International Ltd.
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Page 18: Maintenance
Micron Modem 6. Maintenance There are no user serviceable components in the Micron Modem and there is no reason to dismantle the device. Wash down with fresh water each time the Micron Modem is recovered from the water, paying particular attention to the transducer and connector. -
Page 19: Testing With Hyperterminal Or Docklight
Menu). 2. Enter the name for the Terminal window and then click OK: 3. Next select the COM port number of the port that the first modem is connected to and click OK. 0630-SOM-00001, Issue: 01 © Tritech International Ltd. - Page 20 6. Ensure that the Send line ends with line feeds and Echo typed characters locally options are checked and click OK to apply the settings and then click OK on the properties dialog. 0630-SOM-00001, Issue: 01 © Tritech International Ltd.
- Page 21 HyperTerminal with one Master modem. The Master modem ASCII message is broadcast to all Slave modems in range and each Slave modem message is only received by the Master modem. 0630-SOM-00001, Issue: 01 © Tritech International Ltd.
- Page 22 Project Settings dialog. Within this dialog select the appropriate COM port for the modem to be used. Ensure the baud rate is set to match the modem (9600 by default) and that the Send/Receive option is selected. 0630-SOM-00001, Issue: 01 © Tritech International Ltd.
- Page 23 Then the COM port that the Slave is connected to should be selected and the commands sent again. This will check that both modems can send and receive commands. An example output is shown: 0630-SOM-00001, Issue: 01 © Tritech International Ltd.
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Page 24: Chirp Signal Processing
CHIRP pulse which means the range resolution is given by: velocity of sound Range resolution = 2 x bandwidth The bandwidth of a typical Tritech International Ltd CHIRP system is 50kHz 0630-SOM-00001, Issue: 01 © Tritech International Ltd. - Page 25 Longer transmissions (and operating ranges) can be achieved without a loss in range resolution. Additionally CHIRP offers improvements in background noise rejection, as the sonar is only looking for a swept frequency echo, and removes random noise or out-of- band noise. 0630-SOM-00001, Issue: 01 © Tritech International Ltd.
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Page 26: Glossary
RS485 A standard for defining the electrical characteristics of drivers and receivers for use in a balanced digital multipoint system (also known as EIA-485). Receive (data) Transmit (data) Universal Serial Bus. 0630-SOM-00001, Issue: 01 © Tritech International Ltd.
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