Standard Horizon DS41 User manual

DS41
Digital Depth Sounder
Owner’sManual
Standard 2 Inch Installation
Dual Station Operation
NMEA Repeater
Reads in Feet Fathoms or Meters
Adjustable Prop or Surface Offset
Shallow and Deep alarms
Dual
Station
Operation

DS41Owner’sManualDS41Owner’sManual DS41/HS/2G
Contents
Specifications .................................................................................................................2
Operation ........................................................................................................................3
Alarms ........................................................................................................................3
AlarmsOn/Off .............................................................................................................3
Shallow Alarm............................................................................................................3
Deep Alarm ................................................................................................................4
Instrument Setup............................................................................................................4
Keel/Surface Offset ....................................................................................................4
Transducer Setting .....................................................................................................5
Units of Measure ........................................................................................................5
Troubleshooting ..............................................................................................................6
What comes with your Digital Depth Sounder .............................................................7
Standard ....................................................................................................................7
Options .......................................................................................................................7
Replacement Parts ....................................................................................................8
Installation ......................................................................................................................9
Face Plate Installation................................................................................................9
Instrument Installation................................................................................................9
Transducer Installation.............................................................................................11
General...............................................................................................................11
Sailboats ............................................................................................................12
Powerboats.........................................................................................................12
Transom Installation ...........................................................................................13
In-Hull Installation ..............................................................................................13
Appendix A – Dual Station Operation .........................................................................14
Master/Slave Selection ............................................................................................14
Linked or Separate Selection ..................................................................................15
Appendix B – NMEA Repeater Mode..........................................................................16

DS41Owner’sManual2
Specifications
• Size
Mount 2" (51mm) diameter hole
Depth behind face plate 3.75" (95mm) max.
Display 3-character LCD
• Color
Black with texture on bezel.
• Backlighting
Red colored diffused lighting for display.
• Water Integrity
Front will withstand direct water spray.
• Depth/Alarm Range
2.0!600 feet
0.6!184 meters
0.3!100 fathoms
(to 9.9 in tenths)
• Sensitivity
0.05mV RMS.
• Transmit Power
36 W RMS nominal at 13.6 VDC.
• Transducer
200 kHz 1900 pF/600 Wparallel.
• Display Updating
1 second.
• OperatingVoltage
9.5 VDC to 16.5 VDC.
• Operating Temperature
0°C to 50°C (32°F to 122°F).
• Current Drain
150mA max, including internal buzzer.
• Data Input/Output
Single wire data output/Input.
Dual station mode outputs NMEA DPT
sentence. Dual station inputs NMEA DPT
sentence. In the linked mode a dual station
pair also transfer function settings eg. Alarm
on/off.
• NMEA Output
DPT.
• NMEA Input
DPT and DBT.
• External Buzzer Output
12VDC Buzzer, 100 mA max.
• RF Interference
<6 dB quieting on any marine radio channel
(with 3 dB gain antenna) within one meter of
the instrument. Complies with CE EMC
standards EN50081-1 and EN50082-1.
OFFON
888
^V
Horizon Depth
Display is backlit for
Night Operation
Alarm On/
Change Value Up
Alarm Off/
Change Value Down

DS41Owner’sManual3
Operation
Whenever power is applied the depth sounder
is active and water depth is displayed. If the
sonar signal does not show a bottom the display
will indicate “- -”. This can occur if the water is
aerated or the maximum depth is exceeded.
Note: The maximum depth decreases as boat
speed increases.
Alarms
Two types of alarms can be set; the Deep Alarm
and the Shallow Alarm.The Deep Alarm can be
set as high as 184 meters (605 feet) while the
Shallow Alarm can be set as low as 0.3 meter
(1 foot).
Whenever the water depth is greater than the
Deep Alarm setting and the alarm is enabled an
alarm will sound. The alarm repeats two short
beeps and alternates DAL and the water depth
on the display.
Whenever the water depth is less than the
Shallow Alarm setting and the alarm is enabled
an alarm will sound.The alarm repeats a single
long beep and alternates SAL and the water
depth on the display.
Alarms On/Off
Alarm settings are saved in memory.
To turn the alarm on, press the "(ON) key. An
arrow on the lower right corner of the display will
show (next to the Alarm Bell), to indicate that the
alarms are on.
120#
OFF
ON
ON
^
^V
To turn the alarms off, press the #(OFF) key.
The arrow in the lower right corner will
extinguish.
120#
OFF
OFFON
^
V
V
Note:
The arrow will flash if alarms are turned
ON but the shallow alarm is individually
set to OFF. See next section.
Shallow Alarm
To set the shallow alarm:
1. Press the "key for three seconds. The
display will show:
Press for 3 Seconds
SAL
OFFONON
^^V
2. After a few seconds the display will indicate
the current Shallow Alarm depth setting.
8
8
51
3. Use the "and #keys to change the
value. If either key is held depressed for
more than one second the reading will
increase or decrease rapidly.
4. When the alarm is set, exit by pressing
both the "and #keys simultaneously.
Alternatively, if no keys are pressed for a
period of 5 seconds the normal depth
display will resume.
OFFOFFONON
^^VV
Press simultaneously to exit
Note:
If the reading is decreased to below
1.5 feet (or equivalent) the display will
show !"" and the alarm will be disabled.
The alarm can also be disabled by
pressing both the " and # keys for 5
seconds. The word !"" will be displayed
but the alarm depth will be retained for
future use.

DS41Owner’sManual4
Deep Alarm
To set the deep alarm:
1. Press the #key for three seconds. The
display will show:
dAL
OFF
OFFON
^
V
V
2. After two seconds the display will indicate
the current Deep Alarm depth setting.
8
8
50
3. Use the "and #keys to change the
value. If either key is held depressed for
more than one second the reading will
increase or decrease rapidly.
4. When the alarm is set, exit by pressing
both the "and #keys simultaneously.
Alternatively, if no keys are pressed for a
period of 5 seconds the normal depth
display will resume.
OFF
OFF
ON
ON
^
^
V
V
Press simultaneously to exit
Note:
If the reading is increased one step above
600 feet (or equivalent) the display will
show !"" and the alarm will be disabled.
The alarm can also be disabled by
pressing both the " and # keys for 5
seconds. The word !"" will be displayed
but the alarm depth will be retained for
future use.
Press for
3 Seconds
Instrument Setup
Keel/Surface Offset
An offset may be automatically added to or
subtracted from the depth reading to
compensate for the location of the transducer.
This allows the instrument to indicate the water
depth relative to the bottom of the keel or the
surface of the water.
To set the keel/surface offset:
1. Apply power while holding down the "key.
OFF
ON
ON
^
^V
Holddown during powerup
2. When the unit is on, release the "key.The
display will indicate if the current offset is
keel offset or waterline offset:
Hull Offset (Depth below the keel)
Surface Offset (Depth below the surface)
3. After 5 seconds the display will indicate the
current offset.
Note:
A negative offset is used to display depth
below the keel and a positive offset is
used to display depth below the surface.

DS41Owner’sManual5
4. Use the "and #keys to change the
value. If either key is held depressed for
more than one second the reading will
increase or decrease rapidly.
5. The offset can be programmed in 0.1 unit
steps from -9.9!9.9 feet (or equivalent).
When programmed for a negative offset, ‘-’
will be indicated on the left hand side of the
display.
6. To display depth below the keel enter the
vertical distance between the bottom of the
keel and the depth trasnducer as a
negative value.
7. To display depth below surface enter the
vertical distance from the waterline to the
depth transducer as a positive number (no
negative sign).
8. To exit this mode, press and hold both the
"and #keys simultaneously. Alternatively,
if no keys are pressed for a period of 5
seconds normal depth display will resume.
OFF
OFF
ON
ON
^
^
V
V
Press simultaneously
The display will now indicate the current
water depth.
Transducer Setting
A Transducer Setting is provided to allow the
D41 to be used with different transducer types.
The default setting (=0.0) is used for most
transducers.
Some transducers ‘ring’after the sonar transmit
pulse (just like hitting a bell).This ringing can be
interpreted as an echo from a shallow bottom.
The setting is used to increase the required level
that shallow echoes must meet before they will
be displayed.
If the D41 gives repeated false readings of 1.5
to3feet depth while in deepwaterthe transducer
setting should be increased. Adjust it upward by
0.5 at a time and retest. The range of values is
-0.9 to +2.5. If the value is set too high it could
cause erratic readings in shallow water.
Changing the Transducer Setting
1. Apply power while holding down the "ON
key. The display will show either HOF or
SOF for 7 seconds. Continue to hold the
key down.
Units of Measure
To select the displayed unit
1. Apply power while holding down the #key.
OFF
OFFON
^
V
V
Holddown during powerup
2. When the unit is on, release the #key.The
display will indicate the current display unit
with:
88Ft
8888
Feet Meters
88FA
Fathoms
3. Use the "and #keys to change the
value.
4. To exit this mode, press and hold both the
"and #keys simultaneously. Alternatively,
if no keys are pressed for a period of 5
seconds normal depth display will resume.
OFFOFFONON
^^VV
Press simultaneously
The display will now indicate the current
water depth in the selected display unit.
2. The display will show tdr.
tdr
3. Release the key.
4. After 2 seconds the display will show the
Transducer Setting value eg 0.0
5. Use the "and #keys to change the
value.
6. To exit this mode, press and hold both the
"and #keys simultaneously.

DS41Owner’sManual6
Troubleshooting
No display:
1. Check DC power connections and DC polarity with voltmeter.
2. Check fuse.
No depth reading (####
####
##) at all depths:
1. Check transducer for growth or multiple coats of paint.
2. Check the transducer cable for cuts and sharp bends.
3. Check that the transducer connection behind the D41is firm and free of
corrosion.
Erratic readings while moored:
Check transducer for growth or multiple coats of paint.
Erratic readings while moving:
Cavitation (air) under the face of the transducer. Review installation and
reinstall if necessary.
Erratic readings only while engine is running:
1. Re-route power and transducer cables away from engine, ignition wires
and battery cables.
2. Add feed-through filter capacitor on the positive terminal of the ignition
coil.
3. Add an alternator whine filter to alternator.
4. Replace spark plug wire with resistive type.

DS41Owner’sManual7
What comes with your Digital Depth Sounder
Standard
Mounting Bracket .................................................................With mounting hardware
Extension Power Cord .........................6 feet long with quick-disconnect connectors
Twist Lock Face Plate........................................................................................Round
Options
DTS50
Plastic Low Profile Transducer DTS51
Transom Mount Transducer
DTS52
Bronze Long Stem Thru-hull Transducer

DS41Owner’sManual8
2.75"
2.125"
13°
Note: All transducers come with 30 feet of cable.
Replacement Parts
The following parts may be ordered from the Parts Department. To order, call Toll-free
Number: 1-800-487-2788.
Square Face Plate ............................................................Part Number 568001012A
Round Face Plate .............................................................Part Number 568002012A
Gasket ............................................................................. Part Number RRDS410001
Mounting Bracket ..............................................................Part Number 160001020A
Mounting Nut..................................................................... Part Number 580010123A
DTS53
Bronze Low Profile Transducer DTS55 In-Hull Transducer

DS41Owner’sManual9
Installation
Face Plate Installation
1. To install a face plate:
a) Attach the face plate to the front panel
of the instrument.
b) Twist the face plate clockwise until tight.
2. To remove face plate, twist it anticlockwise
until loose and detach.
Instrument Installation
Theinstrument can be easilyinstalledin different
types of instrument panels. Refer to Figures 3,
4, and 5 for the following steps.
1. Select a suitable location for the instrument.
When selecting the location for mounting,
the following are recommended:
•Controls of the instrument must be
accessible to the user.
•Electrical connections must be routed to
the boat system as directly as possible,
minimising the length of cable where
practical.
•Location should provide as much
protection from the elements as
possible.
•The panel for mounting the instrument
should be 1/8 to 3/4 inch thick.
•The space behind the instrument panel
must have a depth of at least 3.75
inches. See Figure 1 for dimensions of
the instrument.
2. Drill a 2-inch hole on the instrument panel
in the selected location.
3. With the mounting bracket removed, insert
the instrument into the hole until the back of
the face plate is flush with the outside
mounting wall.
4. Slide the bracket over the body of the
instrument.
Note:
Orient the bracket in such a manner
that it does not cover the buzzer.
5. Tighten the mounting nut until the bracket
is secure.
2.5"
2.5"
2.5"
INTERCHANGEABLE FACE PLATES
3.75".5"
.75"
SQUARE FACE PLATEROUND FACE PLATE
Figure 1. Depth Sounder Dimensions