Raymarine DSM250 Owner'S Handbook Manual Download

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3-4

DSM250 Digital Sounder Module

Figure 3-1:

Using the DISPLAY Key

The selected mode is shown by an icon with a black (mono-
chrome display) or red (color LCD) border and the mode is dis-
played on the screen.

When

SONAR

mode is shown (as in

Figure 3-1

), press

ENTER

CLEAR

. The default soft keys are displayed. The display shows

the sounder screen.

BRG

099o

RNG

2.410

CURSOR

0
0

SELECT

WINDOWS

OFF ON

SPLIT

HOR VER

D6191-1

"DISPLAY" TO SELECT FULL SCREEN OPTION

SOFTKEYS TO SELECT WINDOW OPTION

CHART SONAR

LOG

RADAR

Summary of Contents for DSM250

Page 1: ...DSM250 Digital Sounder Module Owner s Handbook Document number 81211_1 Date December 2002...

Page 2: ......

Page 3: ...t ments require specialized service procedures and tools only avail able to qualified service technicians there are no user serviceable parts or adjustments The operator should never remove the cover...

Page 4: ...they can function with the DSM250 Echo sounder systems require an appropriate Raymarine trans ducer unit and inter connecting cable Details for selecting and installing the transducer are described i...

Page 5: ...d updating may change product specifications without prior notice As a result unavoidable differences between the product and handbook may occur from time to time for which liability cannot be accepte...

Page 6: ...s technology provided under license by Acorn Group plc The copyright of this intellectual property is acknowledged by Raymarine Inc as are Acorn s trademarks and patents Acorn s world wide web address...

Page 7: ...y 1 5 Operating Modes 1 7 Sonar Options 1 8 Sounder Functions 1 9 Chapter 2 Installation 2 1 2 1 Introduction 2 1 Planning the Installation 2 2 EMC Installation Guidelines 2 2 2 2 Unpacking and Inspec...

Page 8: ...nar Mode 3 3 3 6 Simulator Mode 3 5 Viewing Simulator Data 3 6 Chapter 4 System Setup 4 1 4 1 Introduction 4 1 4 2 Changing the Set Up Parameters 4 1 4 3 System Set Up Parameters 4 3 Data Boxes 4 5 Be...

Page 9: ...tor 4 17 Version Serial Numbers 4 17 Chapter 5 Basic Display Controls 5 1 5 1 Introduction 5 1 Simulator 5 1 5 2 Setting Color and Brightness 5 1 Lighting and Contrast Monochrome Displays 5 1 Brightne...

Page 10: ...ensitivity 6 5 Using Alarms 6 8 6 3 Using VRM to Determine Depth Distance from Vessel 6 10 6 4 Waypoints 6 12 Placing a Waypoint 6 13 6 5 MOB 6 14 Chapter 7 Maintenance and Problem Solving 7 1 7 1 Mai...

Page 11: ...non PLUS display unitsmustbe upgraded tohsb2 before they can function with the DSM250 Figure 1 1 DSM250 Digital Sounder Module The DSM250 employs a very high transmission repetition or ping rate which...

Page 12: ...m the illustration How to Use This Handbook If you are installing the DSM250 yourself you should read Chapter 2 before you start the installation For an overview of the display unit controls read Chap...

Page 13: ...tic Gain modes These automatic modes make the gain adjustments for you based on depth and water conditions The DSM250 provides three pre defined automatic gain settings for Cruising Trolling and Fishi...

Page 14: ...erating normally If the unit detects a problem the LED blinks amber to indicate a warning or red for an error The number of timestheLEDblinks is acoderepresentingthenatureoftheprob lem Refer to Status...

Page 15: ...plit frequency sonar display 50 kHz 200 kHz Display options sonar window zoom bottom lock and A Scope Horizontalandverticalhalf screenwindowstodisplayadditional data Position data requires GPS 1 2 Son...

Page 16: ...able data boxes These data boxes can be moved around the screen and they can be switched on or off Chapter 3 includes details on adjusting the display other set up options are described in Section 4 4...

Page 17: ...ertical Half Screen Window Options This option splits the sounder vertically The left hand window dis plays data boxes there are three different sets of data A B and C that you can select for display...

Page 18: ...rmines the optimum frequency of operation based on the current depth Bottom Lock changes the operating mode to re set the bottom It provides a bottom up view the bottom is used as the reference its im...

Page 19: ...cy the scrolling bottom graph is dis played in both frequencies split horizontally Zoom Bottom Lock or A Scope can be displayed with the dual frequency graph All of these options are available when th...

Page 20: ...80 6 8 27 2 27 2 200kHz 50kHz 200kHz 200kHz 50kHz SPLIT 0 80 ZOOM FREQUENCY BTM LOCK A SCOPE AUTO GC Z H 200kHz 10 20 30 80 80 0 ZOOM FREQUENCY BTM LOCK A SCOPE AUTO GC Z H SPLIT D6202 1 0 X4 Split F...

Page 21: ...apter 3 For power connect a 12V or 24V DC power supply attaching the red wire via a quick blow 8A fuse to pos itive and the black wire to negative See Section 3 6 for details For the system to display...

Page 22: ...derstand what fac tors could affect the operation of the product The guidelines given here describe the conditions for optimum EMC performance but it is recognized that it may not be possible to meet...

Page 23: ...houldnot be removed If the ferrite needs to be removed during installation it must be reassembled in the same position Suppression Ferrites The following illustration shows typical cable suppression f...

Page 24: ...from prolonged exposure to rain salt spray and direct sunlight but well ventilated Locate the sounder as close to the transducer as possible Raymarine suggests not locating the DSM250 on the main con...

Page 25: ...ed if desired Refer to Section 2 4 The maximum length of cable between the sounder module and the transducer unit should not normally exceed 30 ft 10 m If you need to use a longer cable refer to Secti...

Page 26: ...o 32 V HSB cable suppliedwith theunit This 10 ft 3m cableisusedto connect the DSM250 to the display unit Other lengths of HSB cables are available from Raymarine See Table 2 1 Parts and Accessories on...

Page 27: ...ion 2 7 Figure 2 3 DSM250 Unit Dimensions 9 96 in 252 9 mm D6168 1 3 46 in 88 mm 9 51 in 241 6 mm 10 76 in 273 3 mm 7 37 in 187 2 mm Weight 2 2 lbs 1 0 Kg Compass Safe Distance 39 in 1 m 2 43 in 61 7...

Page 28: ...a pencil mark the tops narrow ends of the four key holes onto the mounting surface Set aside the module 3 Drill a 9 64 pilot hole at each of the four marked locations Note For fiberglass with a gelco...

Page 29: ...ducer connection Ground connection Power for 12 V 24 V or 32 V DC power connection and one RF ground screen connection HSB in out connector forconnecting to an hsb2 PLUS Series dis play Chartplotter F...

Page 30: ...the unit The power cable may be extended by up to 60 ft 20 m using a wire gauge of AWG 12 or greater DC power is connected at the three pin POWER connector on the unit s connector panel The connector...

Page 31: ...is connected to the sys tem A single ground point should be used for all equipment You may ground the DSM250 by connecting the drain wire shield of the Power Input cable to the ship s RF ground If you...

Page 32: ...d with the DSM250 These cables are also available in lengths of 1 6 10 and 20 m See Table 2 1 Parts and Accesso ries on page 2 4 for the complete list and associated part numbers The HSB cable is atta...

Page 33: ...tached to the 7 pin male connector marked TRANSDUCER on the connector panel of the DSM250 How you connect the cable depends on the type of transducer you have installed Combined depth speed temp trans...

Page 34: ...or Do not try to shorten or splice the cable Cutting the transducer cable will severely reduce sonar performance If the cable is cut it must be replaced it cannot be repaired Cutting the cable will al...

Page 35: ...e the transducer cable and then return power to the module Asasafetyfeature the DSM250only recognizes thatthe transducer is connected at power up EMC Conformance Always check the installation before g...

Page 36: ...2 16 DSM250 Digital Sounder Module...

Page 37: ...n the DSM250 places it in memo ry If you power down the sounder less than one minute after making a change the setting is lost 3 2 Powering on the Sounder Module There is no power switch on the DSM250...

Page 38: ...e is complete or if no update is required the normal startup screen appears on the display 6 Power off the DSM250 and reconnect the transducer 7 Power on the DSM250 3 4 Selecting Repeater Mode Depth d...

Page 39: ...5 Press ENTER The display unit is now designated as the Repeater Full details on setting up your DSM250 and display are given in Chapter 4 3 5 Selecting Sonar Mode If properly connected to an hsb2 PL...

Page 40: ...and the mode is dis played on the screen When SONAR mode is shown as in Figure 3 1 press ENTER or CLEAR The default soft keys are displayed The display shows the sounder screen BRG 099oR RNG 2 410nm...

Page 41: ...tsmustbe upgraded tohsb2 before they can function with the DSM250 Before using Simulator mode make sure the HSB cable is con nected from the DSM250 to the display unit and that both the DSM250 and dis...

Page 42: ...d 3 Use the trackpad to move the selection bar over the option SONAR SIMULATOR The simulator soft keys are displayed 4 Press the ON soft key to switch on the sonar simulator 5 Press ENTER twice to ret...

Page 43: ...rom the time you make the setting change to when the DSM250 places it in memo ry If you power down the sounder less than one minute after making a change the setting is lost This chapter covers the fo...

Page 44: ...rolled by a slider that is displayed above two of the soft keys For some parameters a soft key provides access to a sub menu of further options 4 Press the soft key corresponding to the desired settin...

Page 45: ...DEPTH COG SOG TIME DATE WIND WAYPOINT CROSS TRACK ERROR HEADING LOG TRIP PILOT VMG TEMPERATURE TIDE SET DRIFT OFF LAT LONG or TDs OFF or ON OFF or ON OFF or ON OFF or ON OFF or ON OFF or ON OFF APPAR...

Page 46: ...UP APB BWC BWR DBT DPT MTW RMB RSD RTE TTM VHW VLW WPL GGA GLL RMA RMC VTG ZDA OFF or ON OFF or ON OFF or ON OFF or ON OFF or ON OFF or ON OFF or ON OFF or ON OFF or ON OFF or ON OFF or ON OFF or ON...

Page 47: ...US Series radar display or is connected to one via hsb2 Data boxes provide regularly used data in a compact form so that most of the graphics can still be seen The ones you select here can be turned o...

Page 48: ...in the cursor Rng Brg data boxes The current units are shown for the heading value in the status bar at the top of the screen Cursor Readout This option controls whether radar cursor data is shown in...

Page 49: ...based on position data or on dead reckoning DR Dead reckoning normally provides a better indication of the course to an object in the water on the assumption that your vessel and the object are both s...

Page 50: ...riation value for each and highlights the currently selected mode Auto Mode If you select Auto mode the unit obtains the value of variation automatically normally from received data The variation valu...

Page 51: ...Talk bus The Bridge NMEA Heading option can be used to prevent NMEA heading data being bridged onto the SeaTalk bus For example if you have a course computer connected on SeaTalk and NMEA and an activ...

Page 52: ...B Autopilot Sentence B BWC Bearing Distance to Waypoint BWR Bearing Distance to Waypoint Rhumb Line DBT Depth Below Transducer see note below DPT Depth see note below MTW Water Temperature RMB Recomme...

Page 53: ...entity of the target by looking at the radar cursor position on the chartplotter Press the CURSOR ECHO soft key to display the cursor transfer soft keys The following options can be toggled ON or OFF...

Page 54: ...filter setting as required This can be set to HIGH MEDIUM or LOW Compass Set Up This option is used to calibrate a Raymarine heading sensor such as the Pathfinder Smart Heading System Controls are pro...

Page 55: ...up the sounder according to your system configuration and your personal prefer ences The following table lists the Sonar Set Up parameters and their options shows the factory default setting and prov...

Page 56: ...ar or chartplotter display the REPEATER setting is automatically selected and cannot be changed The Sonar HSB Mode setting designates whether the display showing sounder data is the MASTER unit from w...

Page 57: ...cted thus removing it from the hsb2 network Note If you switch the PLUS fishfinder display from REPEATER to MASTER you must remove the DSM250 from the hsb2 network and power off on the display unit fo...

Page 58: ...ar History Sonar History determines the number of data sample columns that appear on the screen at one time The options are SMALL which displays 240 columns of data or LARGE which shows 480 col umns I...

Page 59: ...nctions All controls are functional in Simulator mode with the exception of STC Version Serial Numbers The area at the bottom of the Sonar Setup screen gives version information for the system This ar...

Page 60: ...4 18 DSM250 Digital Sounder Module...

Page 61: ...ut data from the transducer Section 3 6 describes how to switch the dis play to simulator mode The DSM250 must be connected to an hsb2 PLUS Radar Chart plotter or Fishfinder display unit to show echo...

Page 62: ...ault screen with thenew lighting and contrast levels retained or press CLEAR to discard the changes and return to the default screen If lights are left ON when you switch off the display the next time...

Page 63: ...softkeyindicatesthebrightnesslevel usethetrackpad upordown toincreaseordecreasethesetting Youcanpressand hold the trackpad to change the setting more rapidly The bright ness level is adjusted as you c...

Page 64: ...or right BACKGROUND COLOR soft key until the desired color is highlighted The sounder display changes so you can see the effect as you change the background color 5 Press ENTER or CLEAR twice to retur...

Page 65: ...ols 2 Press the COLOR SETTINGS soft key 3 Press the COLOR SET soft key This toggles between color set 1 bolder colors and color set 2 softer colors 4 Press ENTER or CLEAR twice to return to the defaul...

Page 66: ...mode 1 Press the DISPLAY key The DISPLAY pop up appears as shown in Figure 5 1 The selectedmodeisshownbyaniconwithablack monochromedis play or red color LCD border and the mode is displayed on the scr...

Page 67: ...an be shown Table 5 1 Horizontal Half Screen Window Options Full screen mode Horizontal Half Screen Window Options Sonar Mode CDI BDI Depth Temp Chart Radar Chart Mode CDI BDI Nav Data Radar Sonar Rad...

Page 68: ...in your set up To select a Horizontal half screen window for display 1 From the full screen Sonar mode press the DISPLAY key The following soft keys are displayed with an image of each available wind...

Page 69: ...0 10 10 nm nm WPT BRG WPT RNG TTG 1 45nm 23 1nm 01h 13m STEER STARBOARD WAYPOINT 001 351 T SELECT WINDOWS WINDOWS OFF ON SPLIT HOR VER 0 20 40 20 40 ft ft 60 60 60 60 CDI Window BDI Window D6166 1 AUT...

Page 70: ...ach window provides several large for mat data boxes for specific information as follows Data Window A provides surface temperature with a 30 minute temperature graph speed through water and depth Dat...

Page 71: ...S OFF ON SPLIT HOR VER D6191 1 DISPLAY TO SELECT FULL SCREEN OPTION SOFTKEYS TO SELECT WINDOW OPTION CHART SONAR LOG RADAR ZOOM FREQUENCY BTM LOCK A SCOPE AUTO GC F 50kHz 0 DEPTH ft SPEED kts 20 1 15...

Page 72: ...indows the soft key CHRT SNR lets you toggle operating control between the sounder and the chart window Tochangetheactivewindowwhenyouaredisplayingthesonar chart horizontalsplitwindow presstheCHRTSNRs...

Page 73: ...is available in that window and you switch windows off control automatically returns to the full screen upper right window mode 5 4 Display Control Functions Sonar mode automatically locates the bott...

Page 74: ...sa You can switch them off and on individually using the System Set Up menu as described in Section 4 3 Changing the Scroll Speed The standard fishfinder display is the scrolling bottom image This is...

Page 75: ...ary press the SCROLL AUTO MAN soft key to toggle the setting between AUTO and MAN 3 For manual adjustment use the trackpad to change the scroll speed in 10 increments from0to 100 Youcan pressandhold t...

Page 76: ...return to the default screen Changing the Sounder Range By default the sounder automatically adjusts the display range selecting the shallowest range that keeps the bottom in the lower half of the di...

Page 77: ...er range 3 If desired press the RANGE AUTO MAN soft key to select AUTO range AUTO range is indicated by the letter R in the status bar 80 20 20 5 30 10 100 25 25 5 40 10 150 50 30 10 50 10 200 50 40 1...

Page 78: ...g the Frequency on page 5 19 when the sounder completes the auto range hunt process the process is repeated in the other frequency If MANUAL FREQUENCY is selected hunt mode only continues in the selec...

Page 79: ...lly select the appropriate frequency based on the current display range As the depth increases while in Auto Frequency mode the sounder module shifts from 200 kHz to 50 kHz at 250 ft 80 m As the depth...

Page 80: ...requency is indicated by the letter F in the status bar 4 Press ENTER or CLEAR to return to the default display You can choose the split frequency display with the sonar display options Bottom Lock A...

Page 81: ...e Bottom Lock selection soft keys are displayed 2 Press the BTM LOCK OFF ON soft key to toggle the function ON 3 Press the BTM LOCK FULL SPLIT soft key to toggle between a full window bottom lock imag...

Page 82: ...n the bottom lock image or CLEAR to cancel the operation Using A Scope The scrolling bottom display provides a historical record of sonar echoes Use the A Scope screen to show raw sonar data directly...

Page 83: ...n which the image expands to take up the entire A Scope window providing greater resolution iii Mode 3 in which only the left hand side of the image dis playedinMode2expandstotheentireA Scopewindow Th...

Page 84: ...you select split windows the display is split vertically with the zoomimage in the left hand window andthe scrolling bottom dis play in the right hand window See Figure 5 10 In a split window display...

Page 85: ...selected The greater the zoom the smaller the area you are viewing so the smaller the Zoom Range Bar 6 Press ENTER or CLEAR to select To turn off Zoom 1 Press the ZOOM soft key The Zoom soft keys are...

Page 86: ...e 5 11 5 Use the trackpad to move the Zoom Position Line up or down on the screen Movingthe line UP toward thesurfacemoves the Zoom Window DOWN toward the bottom Moving the Zoom Position Line DOWN mov...

Page 87: ...displayedin the zoom left side window 2 The size of this zoom range is determined by the zoom factor 2x 4x or 6x 3 The position of the zoom range on the scrolling bottom right side window is determine...

Page 88: ...5 28 DSM250 Digital Sounder Module...

Page 89: ...ibed in this chapter are retained when the unit is powered off However there is a one minute delay from the timeyouchangethesettingtowhentheDSM250placesitin memory If you power down the sounder less t...

Page 90: ...the bottom Fish Indications When the sounder detects a fish it displays an arch shaped mark In general a larger arch indicates a larger fish though this rule is not always true Let s say that there ar...

Page 91: ...h may be indicated by vertical lines In Bottom lock mode the fish arches may appear distorted as the bottom topography is removed from the image Bottom Indications The bottom usually produces a strong...

Page 92: ...a good echo from the bottom so the upper layer of the bottom is shown as dark gray Notice that the lower layer of the bottom is shown as a lighter gray this indicates a weaker echo This could mean th...

Page 93: ...the WHT LINE soft key to toggle the white line feature ON or OFF Adjusting Display Gain Sensitivity The sounder provides controls for GAIN COLOR GAIN and STC These controls accessed from the GAIN key...

Page 94: ...As you move the slider the value displayed in the slider is updated The new setting takes immediate effect Note Becausethechangestothesettingstakeeffectimmediately you cannot revert to the previous se...

Page 95: ...m However it is not necessaryfor you to select for example Fishing Mode only when you are fishing You may want to take advantage of Fishing Mode s higher gain even when cruising at high speeds Your pe...

Page 96: ...oating debris that often appears in shallow water A low STC value has little effect on gain in shallow water a high STC value decreases the gain in shal low water so that only the strongest echoes are...

Page 97: ...depth at which the Shallow Alarm is set Conversely the Shallow Alarm must be set at a depth that is less than the depth at which the Deep Alarm is set After you have acknowledged the sounding of a sha...

Page 98: ...nar mode to determine the depth and distance behind boat of an object on the display The VRM function is available on the scrolling sonar dis play bottom lock and zoom windows A VRM is displayed as a...

Page 99: ...in bottom lock window but not in the scroll ing sonar window To switch the VRM on or re position an off screen VRM 1 Press VRM EBL The VRM is displayed in its last used position The cursor is positio...

Page 100: ...be placed at the cursor position or at the vessel s current position this is sometimes known as an event mark all waypoints placed on the sounder are stored in a waypoint data base list with position...

Page 101: ...e cursor away from the waypoint or press CLEAR You can use the EDIT WAYPOINT soft key to name the waypoint as described in Editing Waypoints below 2 Press CLEAR or ENTER to remove the place waypoint s...

Page 102: ...ess ENTER or CLEAR twice For full details on working with waypoints refer to the handbook for your PLUS Series Radar Chartplotter or Fishfinder display 6 5 MOB If you lose a person or object overboard...

Page 103: ...data box showing the bearing and distance from your vessel to the MOB waypoint position and the elapsed time since the MOB was initiated Figure 6 3 Sounds a 4 second alarm pattern every 30 seconds Sen...

Page 104: ...6 16 DSM250 Digital Sounder Module...

Page 105: ...o service the equipment The operator should not remove the rear cover of the module Routine Checks The DSM250 is a sealed unit Maintenance procedures are there fore limited to the following periodic c...

Page 106: ...jammed by dirt grit or barnacles Work the contaminant out of the mechanism then clean the unit with soap and water or alcohol Cleaning the Hull Use caution when sanding or cleaning the outside of the...

Page 107: ...y result in momentary faulty operation 7 2 Resetting the System There are two types of reset available for the DSM250 Factory Reset This resets all values back to their original fac tory settings WARN...

Page 108: ...ollowing keys DISPLAY MULTI VRM EBL MARKS RANGE GAIN or ALARMS This action opens up a new menu according to the key pressed or Press either the ENTER or CLEAR key This action returns the unit to the S...

Page 109: ...hat the transducer hasn t kicked up on hitting an object 2 Check that the gain is not set too low 3 Check that the transducer is within 10 of vertical 4 Check that the transducer face is not covered o...

Page 110: ...following table shows the various LED status codes and their meanings 1After 30 seconds of no hsb2 activity the DSM250 enters Standby mode No sonar pings are emitted and no warnings are output on the...

Page 111: ...for the latest informa tion on Raymarine electronic equipment and systems at www raymarine com Customer Support Navigate to the Customer Support page for links to Finding Factory Service locations an...

Page 112: ...pecialists are available to answer ques tions about installing operating and trouble shooting all Rayma rine products Questions can be sent directly to our Technical Support Depart ment via the Intern...

Page 113: ...ervice and accessories may be obtained from your authorized dealer or contact Raymarine Ltd Anchorage Park Portsmouth Hampshire England PO3 5TD Tel 44 0 23 9269 3611 Fax 44 0 23 9269 4642 Technical Su...

Page 114: ...7 10 DSM250 Digital Sounder Module Worldwide Support Please contact the authorized distributor in the country...

Page 115: ...erproof to CFR46 0 C to 55 C 10 C to 70 C up to 95 at 35 C non condensing Connectors 7 pin transducer 3 pin HSB input output 3 pin power external ground Interfaces 1 x hsb2 receive and transmit with s...

Page 116: ...A 2 DSM250 Digital Sounder Module...

Page 117: ...5 7 5 9 Chart Mode 1 7 5 7 Simulator 4 12 Window Options 1 7 5 7 5 9 Cleaning Instructions 7 1 COG Course Over Ground Data Box 4 3 5 10 Color Bar 4 13 4 14 Color Gain 6 7 Color Threshold 5 4 Compass S...

Page 118: ...y Background Color 5 4 Brightness 5 3 Lighting 5 1 5 3 Operating Modes 1 7 Selecting 3 2 3 3 5 6 Sonar Options 1 8 DISPLAY Key 1 7 3 3 5 6 5 8 5 12 Distance Determining Using VRM 6 10 E Echoes 1 5 5 2...

Page 119: ...t 4 4 4 7 MOB 6 14 Alarm 6 15 Cancel 6 15 Data Box 6 15 Data Selection 4 3 4 7 Symbol 6 15 Waypoint 6 15 Modes 1 7 Chart 1 7 5 7 Data Log 1 7 5 7 Full Screen 5 6 Radar 1 7 5 7 Sonar 1 7 5 7 Mounting 2...

Page 120: ...ons 1 9 HSB Mode 4 13 4 14 Mode 1 7 5 7 Full Screen 1 7 Set Up 4 1 4 13 Simulator 3 5 3 6 4 13 4 17 5 1 Switching Control Between Sound er and Display 5 12 Window Options 1 7 5 7 5 9 5 11 Sonar Histor...

Page 121: ...4 3 VRM EBL Key 6 10 W Warning codes 3 1 7 6 Warranty v Waypoint Data Box 4 3 5 10 Database List 6 12 6 13 Placing 6 12 White Line 6 2 6 5 Wind Data Box 4 3 Window Options BDI 1 7 5 7 5 9 CDI 1 7 5 7...

Page 122: ...vi DSM250 Digital Sounder Module...

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