Simrad HS52 Instruction Manual
INSTRUCTION MANUAL
20222360 / E i
INSTRUCTION MANUAL
SIMRAD HS52
GPS compass and DGPS navigator
20222360E English
Simrad HS52 GPS compass and DGPS navigator
ii 20222360 / E
Document revisions
Rev Date Written by Checked by Approved by
A 27.04.2006
FOS
B 22.06.2006 FOS
C 02.08.2006 FOS
D 05.09.2006
FOS
E 16.01.2007 FOS
Document history
Rev. A Original issue.
Rev. B Documentation of the PSXN,20 and RRE format included. Description of system
performance at alarms has been changed
Rev. C Additional description of the PSXN,20 format
Rev. D Changes in the text of the RRE format and updated description of the PSXN,20 format
Rev. E New part no. on the 30 m cable. Declaration of Conformity certificate included.
If you have any comments or constructive criticism to this manual, please send all
such - in writing to:
documentation@sim.net
INSTRUCTION MANUAL
20222360 / E iii
About this manual
This manual is intended as a reference guide for operating, installing and maintaining
the HS52 Heading Sensor. Please take time to read this manual to get thorough
understanding of the operation and system components.
In this manual the following notations are used:
Caution! Used to make the user aware of procedures and operational
practice which, if not followed, may result in degraded
performance or damage to the equipment.
Note! Used to draw the user's attention to special features or behavior of
the equipment.
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INSTRUCTION MANUAL
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Contents
1. INTRODUCTION ................................................................1
1.1 HS52 System Components ............................................ 1
1.2 Definitions, Abbreviations and Acronyms ......................... 3
Definitions .......................................................................3
Abbreviations and Acronyms...............................................3
2. TECHNICAL SPECIFICATIONS ...........................................5
2.1 Health, Environment and Safety ..................................... 5
2.2 Restrictions in Guarantee .............................................. 5
2.3 Restrictions in Use........................................................ 5
2.4 Performance Data ........................................................ 6
2.5 Physical Dimensions ..................................................... 7
Sensor Unit......................................................................7
Display Unit ..................................................................... 7
Processing Unit................................................................. 8
2.6 Power......................................................................... 8
Processing Unit................................................................. 8
2.7 Environmental Specification ........................................... 8
Sensor Unit......................................................................8
Display Unit ..................................................................... 8
Processing Unit................................................................. 9
2.8 Cable ......................................................................... 9
Processing Unit to Sensor Unit Cable ...................................9
2.9 Interface..................................................................... 9
3. INSTALLATION................................................................11
3.1 General .....................................................................11
3.2 Cable Connection ........................................................11
3.3 Grounding..................................................................11
3.4 Sensor Unit ................................................................12
Location of the Unit......................................................... 12
Mechanical Installation .................................................... 13
Cable Wiring .................................................................. 13
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Waterproofing of Connectors ............................................ 14
3.5 Display Unit................................................................15
Location of the Unit......................................................... 15
Panel Mounting............................................................... 15
Bracket Mounting (option)................................................ 16
Display Unit Cable........................................................... 17
3.6 Processing Unit ...........................................................18
Cable Connections .......................................................... 18
Connecting to Simrad Equipment ......................................21
3.7 1PPS Signal Connection ...............................................23
ZDA 1 Hz Message .......................................................... 24
3.8 External Alarm............................................................25
3.9 Software Setup Procedure ............................................26
Display Adjustments........................................................ 27
Differential Corrections .................................................... 28
SBAS Setup ................................................................... 29
3.10 Advanced Software Setup Procedure..............................30
Data Output................................................................... 31
Ethernet ........................................................................ 33
General ......................................................................... 34
Expert Setup.................................................................. 36
4. OPERATING INSTRUCTIONS ...........................................41
4.1 Overview ...................................................................41
4.2 Turning the System ON/OFF .........................................42
4.3 Performance Monitoring ...............................................42
Navigation/HDT Display ................................................... 45
Navigation/POS Display ................................................... 46
Info Displays .................................................................. 46
4.4 Alarms.......................................................................49
Position Alarm Display ..................................................... 50
Heading Alarm Display..................................................... 50
Position and Heading Alarm Display ................................... 51
System Restart............................................................... 51
4.5 Watchdog ..................................................................52
INSTRUCTION MANUAL
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4.6 Operation...................................................................52
Adjust Backlight on Display .............................................. 52
SBAS Corrections............................................................ 52
Height Aided GPS Position ................................................ 53
5. MAINTENANCE ................................................................55
5.1 General .....................................................................55
5.2 Periodic Maintenance ...................................................55
Sensor Unit.................................................................... 55
Processing Unit............................................................... 56
Display Unit ................................................................... 56
5.3 Repairs and Modifications .............................................57
Replacing Damaged Cables .............................................. 57
Replacing Damaged Units................................................. 57
Repair of the Processing Unit ............................................ 57
5.4 Troubleshooting ..........................................................58
No Response .................................................................. 58
No Valid Data ................................................................. 58
Invalid Position............................................................... 59
Reduced Position ............................................................ 60
No Differential Corrections ............................................... 60
Invalid Heading .............................................................. 61
Reduced Heading Indication ............................................. 61
Simulated Data .............................................................. 62
6. FIGURES AND DRAWINGS...............................................63
6.1 Sensor Unit, Dimensions ..............................................64
6.2 Processing Unit, Dimensions .........................................65
6.3 Display Unit, Dimensions..............................................66
7. PARTS LIST ..................................................................... 67
7.1 Standard Delivery .......................................................67
7.2 Optional Equipment .....................................................67
7.3 Documentation ...........................................................67
8. APPENDIX A – PROPR. NMEA MESSAGE ..........................69
9. APPENDIX B - DECLARATION OF CONFORMITY...............71
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INTRODUCTION
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1. INTRODUCTION
1.1 HS52 System Components
The Simrad HS52 provides position and true heading output
with no moving parts. The HS52 combines several vessel
instruments with one compact navigation package;
gyrocompass, GPS receiver equipment, speed log and Rate Of
Turn indicator.
The HS52 comprises the following units:
The Sensor unit contains two GPS sensors, electronic board
with I/O and an inertial rate element.
The Sensor unit is to be mounted in the vessel’s mast or flat on
a roof or deck.
The Display unit contains an LCD for navigation information,
main board with CPU, flash, power and I/O, and buttons for
setup and operation of the HS52 system.
SENSOR UNIT
DISPLAY UNIT
PROCESSING
UNIT
1m
30m
POWER INPUT
15m
Simrad HS52 GPS compass and DGPS navigator
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The Processing unit contains the main board with CPU, flash,
power, I/O and a terminal list.
Precision heading is derived from the fixed-distance dual GPS
antenna arrangement in the Sensor unit, using carrier phase data
to generate heading information independent of latitude and
vessel dynamics. GPS position and speed are calculated from
both antennas, which give redundant position and velocity
sources in this product. Input of DGPS corrections or reception
of SBAS (WAAS/EGNOS) signals may improve position
accuracy.
The inertial rate element provides yaw/ROT information. In case
of short GPS outages, the inertial sensor automatically takes
over as the prime source for heading determination until the
GPS comes back on line. Working together seamlessly, the
inertial and GPS elements of the system insure accurate,
continuous and robust heading information.
The Processing unit includes configurable output serial lines and
Ethernet connections making it easy to distribute HS52 data to
multiple users on board the vessel.
The HS52 requires no scheduled maintenance or re-calibration.
The system offers flexible configuration of the output variables
and interface setup, depending on the vessel and application. It
is easy to operate, install and align.
The HS52 system has the following features:
• True heading anywhere on earth
• 0.5º heading accuracy
• Heading accuracy unaffected by the latitude
• Heading available in periods of GPS drop-outs
• Compliant to WAAS, EGNOS and MSAS Satellite Based
Augmentation Systems
• Capable of DGPS multi-reference station processing
• Combines several instruments with one robust, integrated
product
• Only two-pair cable (no coax) between the mast unit and the
Processing unit on the bridge.
• 20 Hz update rate on heading, rate of turn and position
measurements
• Three RS-422 output serial lines to equipment requiring data
from a IMO approved product
• Three RS-232 configurable output serial lines for non IMO
critical purposes
• Output data on Ethernet
• 1PPS output for synchronization of other survey equipment
INTRODUCTION
20222360 / E 3
The product is type approved as:
• THD (Transmitting Heading Device) using GNSS principle.
BSH type approval no. BSH/4615/4030233/06.
• GPS Receiver Equipment and has a Wheelmark
Be aware that the product can only be certified either as THD or
GPS Receiver Equipment onboard and not both.
1.2 Definitions, Abbreviations and Acronyms
Definitions
Alignment
The process of adjusting the current internal navigation frame
(sensor-frame) in the instrument to the true vessel body frame.
Heading
The direction of the main axis (bow direction) of the vessel.
This is opposed to course, which is the direction of the vessel
motion.
Yaw
A rotation about the vertical axis and is positive when turning
eastward when the vehicle cruises in north direction. Normally
yaw means the dynamic yaw motion.
Abbreviations and Acronyms
CEP
Circular Error Probability
COG
Course Over Ground
DGPS
Differential GPS
ESA
European Space Agency
FAA
Federal Aviation Administration, USA
DU
HS52 Display Unit
EPE
Estimated Position Error
GPS
Global Positioning System
GSA
A standard NMEA message including GPS satellite ID
numbers, PDOP, HDOP and VDOP
HDOP
Horizontal Dilution Of Precision
HGT
GPS Antenna Height above the WGS-84 ellipsoid
IEC
International Electrotechnical Commission
IMO
International Maritime Organization
I/O
Input/Output
NMEA
National Marine Electronics Association. NMEA 0183 is a
standard for interchange of information between navigation
equipment
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PDOP
Positional Dilution Of Precision. A three dimensional geometry
only, dependent on accuracy figure.
1PPS
One Pulse Per Second
PSXN20
A proprietary NMEA message including position, height and
heading quality information
PU
HS52 Processing Unit
RFI
Radio Frequency Interference
RF
Radio Frequency
RMS
Root Mean Square
ROT
Rate of Turn
RRE
Range Residual Error, a specific Ashtech format
RTCM
Radio Technical Commission of Maritime Services
SBAS
Satellite Based Augmentation System
SOG
Speed over Ground
SS
Signal Strength
SSB
Single Side Band
UTC
Universal Time Co-ordinate. This is the official time in the
world and has replaced GMT (Greenwich Mean Time) as the
official time
VDOP
Vertical Dilution Of Precision
VHF
Very High Frequency
WER
World Error Rate
WGS-84
World Geodetic System of 1984
TECHNICAL SPECIFICATIONS
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2. TECHNICAL SPECIFICATIONS
2.1 Health, Environment and Safety
Operation or troubleshooting of HS52 equipment will not imply
any risk for high voltages, explosions or exposure to gas. The
HS52 is type-approved according to IEC 60950/EN60950
standards regarding product safety (low voltage), and IEC
60945/EN60945 standards on electromagnetic compatibility
(immunity/radiation) and vibration.
All HS52 electrical and electronic components have to be
disposed separately from the municipal waste stream via
designated collection facilities appointed by the government or
local authorities. The correct disposal and separate collection of
your old appliance will help preventing potential negative
consequences for the environment and human health. It is a
precondition for reuse and recycling of used electrical and
electronic equipment. For more detailed information about
disposal of your old appliance, please contact your local
authorities or waste disposal service.
2.2 Restrictions in Guarantee
The liability of the manufacturer is limited to repair of the HS52
only, and excludes consequential damages such as customer's
loss of profit or damage to other systems traceable back to HS52
malfunction. The warranty does not cover malfunctions of the
HS52 resulting from the following conditions:
a) The customer has opened the Sensor unit
b) Over-voltage or incorrect power connection
c) The equipment has been exposed to extreme chock and
vibrations
2.3 Restrictions in Use
Simrad HS52 is designed for use on board marine surface
operated vessels with roll and pitch motions up to ±30°.
The HS52 function is based on GPS signals and requires free
sight to the sky, minimum 4 visible satellites, and PDOP value
less than 6 and otherwise normal conditions to operate.
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2.4 Performance Data
Heading accuracy: .........................................................0.5° RMS
Heading resolution:............................................................... 0.01°
Heading operational measurement range: .Roll/pitch within ±30°
Rate of turn accuracy:................................................. 0.5º/s + 5%
Maximum turn rate: ...............................................................80º/s
Maximum speed: ..............................................................515 m/s
Navigation update rate:.......................................................... 2 Hz
Position accuracy GPS, dynamic and static1: .......13 m 95% CEP
Position accuracy with DGPS:..... 1.2 m RMS or 2.5 m 95% CEP
Position accuracy with SBAS:.....1.2 m RMS or 2.5 m 95% CEP
Velocity accuracy: ..............0.03 m/s RMS or 0.07 m/s 95% CEP
COG accuracy (above 1 to 17 knots):......................................±3°
COG accuracy (above 17 knots):............................................. ±1°
Settling time for heading: .................................within 10 minutes
Settling time for position: ...................................within 2 minutes
Acquisition time no valid almanac: ....................within 5 minutes
Acquisition time valid almanac: .........................within 5 minutes
Re-acquisition time after 24 hours GPS signal .............................
interrupt with valid almanac:..............................within 2 minutes
Re-acquisition time when subjected to power ..............................
interrupt of 60 s:..................................................within 2 minutes
GPS position update: ................. 2 Hz (50 Hz with extrapolation)
Sensitive acquisition
2
:..................................................... 130 dBm
Sensitivity tracking3:....................................................... 133 dBm
The performance figures are valid with a minimum of 4 visible
satellites, HDOP less than 4, PDOP value less than 6, high
quality DGPS corrections
4
and otherwise normal conditions.
Excessive multipath, GPS signal obstructions or interference
may reduce the performance.
The HS52 Sensor unit includes two 16-channel GPS receivers.
Frequency GPS L1 1575.42 MHz CA code. The position data
1
As specified by GPS SPS Performance Standards of October 2001
2
As measured at he output of a 3 dBi linear polarized receiving antenna
3
As measured at he output of a 3 dBi linear polarized receiving antenna
4
Has no impact on heading accuracy.
TECHNICAL SPECIFICATIONS
20222360 / E 7
output from the system is referred to the centre of the Sensor
unit both horizontally and vertically.
2.5 Physical Dimensions
Sensor Unit
Width ................................................................850 mm (33.5 in.)
Height: ................................................................205 mm (8.1 in.)
Depth: ...............................................................262 mm (10.3 in.)
Weight: ................................................................. 8 kg (17.6 lbs.)
Color: ................................................................................... White
Dimensional drawing........................................................Page 64
Display Unit
Width: .................................................................220 mm (8.7 in.)
Height: ................................................................110 mm (4.3 in.)
Depth: ...................................................................39 mm (1.5 in.)
Weight: ................................................................ 0.5 kg (1.1 lbs.)
Color: ................................................................................... Black
Dimensional drawing........................................................Page 66
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Processing Unit
Width: ...............................................................287 mm (11.3 in.)
Height: ...................................................................203 mm (8 in.)
Depth: ...................................................................60 mm (2.4 in.)
Weight: ................................................................ 1.3 kg (2.9 lbs.)
Color: ................................................................................... Black
Dimensional drawing........................................................Page 65
2.6 Power
Processing Unit
Nominal Voltage:.............. 12 or 24 VDC in range 10 to 31 VDC
Power consumption: .............................................................15 W
2.7 Environmental Specification
Sensor Unit
IEC 60945 Category: ....................................................... Exposed
Enclosure material, sensor housing: .........................Polyethylene
Enclosure protection:............................................................IP-66
Operating temperature range: ...........-25 to +55ºC (-13 to 131°F)
Operating humidity (max.): ................................................. 100%
Storage temperature range:............... -30 to +70ºC (-22 to 158°F)
Storage humidity (max.):..................................................... 100%
Safe distance to standard compass:.......................... 0.3 m (1.0 ft)
Display Unit
IEC 60945 Category: ..................................................... Protected
Enclosure material: ............................................................. Plastic
Enclosure protection:.............. IP-56 from front, IP-43 from back
Operating temperature range: .............. -15 to +55ºC (5 to 131°F)
Recommended operating temp. range (increased lifetime):
...............................................................0 to +40ºC (32 to 104°F)
Storage temperature range:............... -30 to +80ºC (-22 to 176°F)
Safe distance to standard compass:....................... 0.35 m (1.1 ft.)
TECHNICAL SPECIFICATIONS
20222360 / E 9
Processing Unit
IEC 60945 Category: ..................................................... Protected
Enclosure material: ........................... Plastic/Anodized aluminum
Enclosure protection:............................................................IP-44
Operating temperature range: ...........-25 to +55ºC (-13 to 131°F)
Storage temperature range:............... -25 to +60ºC (-13 to 140°F)
Safe distance to standard compass:.......................... 0.3 m (1.0 ft)
2.8 Cable
Processing Unit to Sensor Unit Cable
Type: ......................................................2x2x0.5 mm2 with shield
Maximum length:................................................... 100 m (328 ft)
Diameter: ..............................................................10 mm (0.4 in.)
Flame retardation:.....................................................IEC 332-3/A
2.9 Interface
Configuration:.......Display unit connected to the Processing unit
Data outputs:........................................Three RS-232 serial lines,
Three RS-422 serial lines,
Ethernet UDP/IP
Data inputs:.................... One RS-232 and one RS-422 serial line
DGPS corrections: ..... RTCM 104 version 2.2 and SAPOS® EPS
Baud rate:...........................................................Max. 38.4 kBaud
HDT, ROT, GGA and GLL data update rates:.......... Up to 20 Hz
HDT, ROT, GGA and GLL data delay:...............Less than 50 ms
ZDA and VTG data update rate:....................................Max 2 Hz
VTG data delay:............................................................ Max 1 sec
ZDA data delay:..................................................................... 1 ms
1PPS signal accuracy:.........................................................0.5 ms
MTBF: ..............................................................................35000 h
MTTR: ......................................................................................1 h
Data output formats:
• NMEA 0183 DTM, GBS, GGA, GLL, GNS, GRS, GSA,
GST, HDT, RMC, ROT, VTG and ZDA. These messages
are according to IEC 61162-1 and follow the standard
regarding unused fields on talker.
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• NMEA 0183 proprietary format PSXN, 20 and the specific
Ashtech format RRE. See page 69 for description of these
formats.
• Radar output on the AD-10 format (Simrad and Furuno radar
compatible) and a 1PPS signal.
• 1 Hz. An NMEA ZDA message that is output at 1 Hz
interval and according to IEC 61162-1. See page 24 for
description of this format.
• STX104. A format used by service personnel for
troubleshooting the system.
INSTALLATION
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3. INSTALLATION
3.1 General
The following parts are supplied with a standard HS52 system:
• Sensor unit with 1 meter cable w/connector and 4 fastening
bolts
• Display unit with 15 meters cable to the Processing unit and
flush mounting kit
• Processing unit including 4 fastening screws
• 30 meters cable to be used between Sensor unit and
Processing unit
• Documentation
Caution!
The Sensor unit has to be mounted in a way that
avoids blocking of the GPS signal.
The Processing and Display Unit can be
mounted on the bridge or in the instrument
room.
No units should be exposed to heavy vibration,
transformers or similar.
3.2 Cable Connection
Use only shielded cables for the installation. This includes
power input and signal cables. The cables should be of 0.5 mm
2
(AWG20) twisted pairs.
The cable to the Display unit and other cables (NMEA
input/output, Ethernet) should not be run in parallel with other
cables carrying RF or high current, such as VHF and SSB
transmitters, battery charges/generators and winches.
3.3 Grounding
All units in the HS52 system use the Processing unit as a
common ground/shield connection. The Processing unit should
therefore have a proper ground connection to the hull/bonding
system.
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3.4 Sensor Unit
Location of the Unit
The Sensor unit is the most important part of the HS52 system,
and great care should be taken when deciding the mounting
location.
The space above the Sensor unit has to be free of obstructions of
any kind. A GPS compass is more sensitive for blocking and
reflections (multipath) of GPS signals than GPS sensors that are
only used for calculating position. This since HS52 also utilizes
carrier phase measurements for heading determination, and both
GPS antennas need to see at least two common satellites at the
same time.
The unit should be protected from direct illumination of radar
beams and other transmitting antennas such as Inmarsat
antennas.
The Sensor unit has to be mounted horizontally in the mast or
directly on deck, with 5° maximum allowed deviation angle
from the horizontal plane. If mounted in the mast, the distance
from the unit to the nearest deck should be as large as possible
to reduce problem due to the multipath effect.
The unit should also be mounted parallel to the vessel’s
centerline with the bow arrow pointing forward. The heading
offset feature will however compensate for a heading offset
caused by the orientation of the Sensor unit. An eventual offset
correction is performed after the calibration as described in
Head Offset on page 36.
INSTALLATION
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Mechanical Installation
The Sensor unit may be mounted in the mast or directly on the
deck.
The dimensional drawing for the Sensor unit on page 64 shows
dimensions and internal distance for the mounting holes and the
cable outlet.
Holder
If necessary, a user-made holder may be used as
shown on the figure when installing the unit.
Caution! Independent of which fastening method that is used, the
Sensor unit should not differ more than ±5° from the vessel’s
horizontal plane and the alongship axis. If the mounting is not
within this tolerance, the heading accuracy will be degraded.
Connectors with
Cable duct
Cable ties
self-bonding tape
Connect the cable from the Processing unit to
the cable from the Sensor unit.
Caution!
The connector junction must be sealed with
self-bonding tape for waterproofing. After
coiling, make bonding by hard pressure.
Use the required number of cable ties to fasten
the cable to the mast.
Cable Wiring
The wiring for the Sensor unit cable in the Processing unit
terminals is as follows:
Cable Wire Signal Description Processing Unit
No. Label
Screen Cable shield Chassis
4 Transmit COMM+
3 Receive COMM-
2 +24 VDC PWR
1 Power ground GND
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If the Sensor unit connector needs to be reconnected to the
cable, the wiring for the cable within the Sensor unit connector
is as follows:
Sensor Unit
Connector
Cable Wire
Signal Description
Pin no. No.
Connector housing Screen Shield
4 3 Receive
3 2 +24 VDC
2 4 Transmit
1
2
4
3
FRONT VIEW
1 1 Power ground
Waterproofing of Connectors
The Sensor unit connector junction has to be sealed with selfbonding tape and PVC/Vinyl tape for waterproofing. Proceed as
follows:
1. Coil the self-bounding tape from one cable end to the other
as shown in the figure below. Use at least two layers with
tape. After coiling, make a bonding by pressure of fingers.
2. Coil at least two layers of PVC/Vinyl tape without stretching
as shown in the figure below. After coiling, make a bonding
by pressure of fingers.
INSTALLATION
20222360 / E 15
3.5 Display Unit
Location of the Unit
Avoid mounting the Display unit where it is easily exposed to
sunlight, as this will shorten the lifetime of the display. If this is
not possible, make sure the unit is always covered with the
white protection cover when not used.
The unit is designed for installation in a protected environment
and for operation within the temperature range. The best
location is typically in the instrument room or on the bridge
mounted close to the Processing unit.
Panel Mounting
Two mounting methods may be used when panel mounting the
HS52 Display unit.
A drilling template, part no. 22084883, is supplied with the
HS52 documentation. Use this template when making panel cutout and drilling holes.
Gasket
1. Remove the front panel corners.
2. Drill the mounting holes and make panel cut-out according
to supplied template.
3. Use the supplied gasket (part no. 22084693) between the
panel and the unit.
4. Fasten the Display unit to the panel with the supplied 19 mm
screws.
5. Apply the front panel corners.
6. Connect the Processing unit cable to the Display unit
connector.
Caution! Do not over-tighten the mounting screws.
Alternative Panel Mounting
This way of mounting is simpler, but will lift the unit from the
panel surface. When installed adjacent to Simrad MarineLine
equipment there will be a 5.5 mm (0,22") difference in height
between the Display unit and other equipment.
Simrad HS52 GPS compass and DGPS navigator
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Gasket
1. Remove the front panel corners.
2. Use the template and drill hole(s) only for the connectors.
3. Place the 7.5 mm gasket (part no. 22086029) between panel
and unit, correctly oriented (see marking on gasket).
4. Fasten the Display unit to the panel with the supplied 19 mm
screws.
5. Apply the front panel corners.
6. Connect the Processing unit cable to the Display unit
connector.
Bracket Mounting (option)
An optional bracket, part no. 22084941, may be ordered from
Simrad.
Note! When the Display unit is bracket-mounted, it is not
weatherproof from the back due to a breathing hole in the back
cabinet. When bracket-mounted, the exposed parts of the plugs
should be protected against salt corrosion.
1. Locate the cradle on the mounting site and mark the 4 holes
for the screws on the mounting surface.
2. Drill the 4 holes and screw the cradle to the mounting
surface.
3. Remove the front panel corners, and use the supplied screws
to fasten the Display unit to the left and right brackets.
4. Apply the front panel corners.
5. Use the two locking knobs to assemble the cradle with the
left and right brackets and adjust the Display unit for the
best viewing angle.
6. Connect the cable from the Processing unit to the Display
unit connector.
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