CASSENS & PLATH NETcourse User manual

Installation & Operation Manual
Magnetic Compass Converter
CASSENS & PLATH GmbH
Manufacturers of Nautical Instruments
Am Lunedeich 131
D-27572 Bremerhaven, Germany
Tel. [phone]
Fax [phone]
[email protected]
www.cassens-plath.de
NETcourse

NETcourse
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www.cassens-plath.de, [email protected]
Content
1) Drawings 3
- 1.1) Dimensions 3
- 1.2) Mounting of Control Unit 3
- 1.3) System Overview 4
- 1.4) Control Unit, Front Controls 5
- 1.5) Control Unit, Front Push Buttons 6
- 1.6) Control Unit , Rear 7
2) Menu-Mode 8
- 2.1) Menu “Load Default Errorlist” 8
- 2.2) Menu “Set Up Errorlist“ 8
- 2.3) Menu “Transmission Protocol“ 9
- 2.4) Menu “Detector Alignment” 9
3) Error Messages / Error Removing 10
4) Installation 11
- 4.1) Installation of Detector 11
- 4.2) Installation of Junction Box 12
- 4.3) Location of Detector and Junction Box within Compass Binnacle 12
5) Wiring 13
- 5.1) Power Supply 13
- 5.2) Connection of Junction Box 13
- 5.3) Connection of Data Output 13
- 5.4) Extension / Shortening of Detector Cable 14
6) Grounding 14
7) Start-up Operation 15
- 7.1) Check of Power Supply 15
- 7.2) Start Instrument and Check Operation 15
- 7.3) Check of Transmission Accuracy 15
8) Pin Connection of Plugs/Connectors 16

NETcourse
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1) Drawings
1.1) Dimensions
Flush mounting:
Weight: 2,1 KG
1.2) Mounting of Control Unit
Flush mounting (cut-out: 225 mm x 125 mm):
120 mm
220 mm
145 mm
245 mm
min. 110 mm
235 mm
85 mm

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1.3) System Overview
Compass
Mounting cylinder
Detector CP102B
Detector cable 1,5 m
(5-wires, screened)
with connector
Junction box
Detector cable 15 m
(5-wires, screened)
with connector
RS-485
Data output
with connector
Emergency power supply
24VDC, 4m (2-wires)
with connector
Main power supply
24VDC, 4m (2-wires)
with connecto
r
Control Unit

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1.4) Control Unit, Front Controls:
ERROR
1) LC-Display 2) On/Off switch 3) Dimmer
1) LC-Display shows actual functions, Menus or error messages
2) On/Off switch
3) Backlight dimmer of LC display

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1.5) Control Unit, Front Push Buttons:
“Back To Operation“ LC-Display “Enter” “Up/Down”
push botton push botton push bottons
“Back To Operation“ push botton Return to operation mode
“Up/Down” push botton Moves Menu one step up or down
“Enter“ push button Activates Menu mode,
Selects Menu
LC-Display Shows operation dialog
and error messages

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1.6) Control Unit, Rear
Grounding
Detector
RS-485 output
Emergency voltage
Main voltage

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2) Menu Mode
Press „Activate Menu/Enter“ to select.
Four Menus can be selected:
- “Load Default Error list“
- “Set Up Error list”
- “Transmission Protocol”
- “Detector Alignment”
Select required Menu by pushing “Up/Down“ push botton.
Press “Activate Menu/Enter“ to activate.
Press „Back To Operation“ to return to operation mode.
For safetey reasons NETcourse will return automatically to operation mode within two
minutes if no push botton was pressed, except Menu “Transmission Error“ was activated
before.
2.1) Menu Item “Load Default Error list“
By pressing “Load Default Error list“ the neutral or factoryside error table will be activated
and stored. The actual error table will be deleted!
Accept safety warning by striking “Menu/Enter“ button. Cancel by “Back To Operation“.
During restorage do not strike any further key!
2.2) Menu Item “Set Up Error list“
Adjust the traditional magnetic compass before correction of transmission error!
Transmission error is the difference of the direct reading of the magnetic compass and the heading
as displayed by NETcourse. This Menu item enables you to establish a errorlist. This is only
necessary in case too large transmission errors are recognized. These transmission errors are caused
by the direct interference of the corrector magnets to the detector, so these errors are not a
malfunction of the instrument but they result from the ship´s magnetic iron resp. their correction!
After activating this Menu item the display shows 0°, the first reference heading to establish
errorlist. Steer the ship into magnetic heading 0° (it is wrong to take out only the compass itself
from its suspension and rotate it into direction 0°). Accept this setting by “Menu/Enter“ push
button. The NETcourse display now proceeds to 15°. Steer the ship into magnetic heading 15° and
accept the setting same as above by actuating “Menu/Enter“ button. This way complete a total
swing of 360° for each reference heading of 15°. It is not necessary to follow each point of the
sequence of reference points. This Menu item also allows to select one of the reference headings
(0°, 15°, 30°, 45° ....) individually. To choose the required reference heading use the “Up/Down“
push button and activate setting by pushing „Menu/Enter“ button. It is not necessary to pass all
reference headings, each heading can be changed individually.

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2.3) Menu Item “Transmission Protocol“
With this menu item the data output protocol can be selected.
Two different sentence formats can be selected:
- $HCHDM,xxx.x,M*CS <CR> <LF>
- $HCHDG,xxx.x,,,,*CS <CR> <LF>
“xxx.x“ is the transmitted magnetic heading and “CS“ for the check sum.
Select the required sentence and data transmission parameters with “Up/Down“ and
activate with “Menu/Enter“.
“HCHDM,4800,1/s”
Sentence: Baud rate: Transmissions per second:
HCHDM 4800 1 transmission per second
HCHDG 38400 10 transmissions per second
30 transmissions per second
All transmissions are of 8 data bits, 1 stop bit and no parity.
2.4) Menu Item “Detector Alignment”
With this menu item the alignment of detector can be executed.
For installation of NETcourse it is necessary to align the detector to the magnetic
compass. For alignment loosen screws of detector a little bit, so that detector can be
turned slightly. Turn detector until displayed heading matches magnetic compass heading.
Fix the screws of detector.

NETcourse
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3) Error Messages/ Removing Errors
If from time to time error message “No Detector Input Data” appears, this can be caused
by an uncorrected heeling magnet of the compass.
So please check if at all corrections (deviation adjustment) were done. If not remove or
position heeling magnet as far as possible to the compass with detector. To find out how to
do this please refer to the relevant operations manual of the compass or compass
binnacle.
Error Reason Remedy
”Power Failure“, Main- /Emergency
voltage below 18 VDC.
Make sure power supply : 24 VDC.
”Transmission Error“, Transmission error table
not valid
Switch off and on instrument.
Carry out transmission error correction
procedure (ref. “Compass Reset“).
”No Detector Input
Data“,
Detector data not valid Make sure correct mounting of detector and
right distance to compass.
Make sure correct wiring of detector.
Make sure that there are no magnetic
interferences at detector location.
Check correct function of detector by use of a
multimeter *).
No function Switch on instrument.
Adjust dimmer to max. brightness to verify that
power is connected.
Make sure wiring and right voltage supply.
No data transmission.
NETcourse shows no
error message.
Make sure that data cables and connectors
are in order.
Interchange data cable A and B.
Make sure that correct output data
specification was selected.
*) Ref. to chapter „Pin Connection of Plugs/Connectors“
Measure resistance between:
Cosine und Reference: 60 Ohm, Sine und Reference: 60 Ohm, Sine und Cosine: 120 Ohm
Exitation 1 und Exitation 2: 50 Ohm, Exitation 1 or Exitation 2 and Reference: not connected
The values should be found within a tolerance of +/- 20%, else the detector might be defective.
Attention: The display shows existing operational errors and gives further
information. Please follow this information and refer to the error
shooting chapter of this operations manual. If the error cannot be
removed in this way switch off the instrument and call the
manufacturer.
Please pay attention to each error message carefully, else proper
operation cannot be guaranteed and safety of the vessel may be
endan
g
ered.

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4) Installation
4.1) Installation of Detector
This chapter may be passed in case the detector is already installed to the compass when
delivered.
As heading source a conventional compass has to be used. Installation of detector is
usually done by glueing it from below centric to the lower cover glass. Between detector
and lower cover glass of the compass a certain distance has to be kept. This will be
guaranteed by a special mounting cylinder which may be ordered from Cassens & Plath as
an extra. The height of the cylinder to keep the right distance between detector and
compass is calculated so that on the one hand any influence from the detector to the
compass indication can be excluded and on the other hand the magnetic field of the
compass card assembly is strong enough to drive the detector.
Attention:
If the detector is too close to the compass the directional system will be deflected!
If the detector is too far away from the compass the magnetic field strength will be
too low to drive the detector!
Keep the correct distance otherwise safe navigation will be not possible!
If the correct distance is unknown there are two different ways do determine it:
1. The magnetic moment (the strength of the magnets) of the compass is known. This
value will often be found in the compass certificate. If, for example, the value is
between 2.0 .... 4.5 Am2, the correct distance between detector and magnet of card
assembly is 110 mm. If the exact location of the magnets inside the float of the
directional system below the card level is unknown take 15 mm for this.
2. Mounting will be done by a qualified compass workshop owning a regular compass
test bench. The procedure to find the correct distance is the same as finding weak
iron interference by swirl error examinations. The compass is turned in a 4 min 360°
turn with and without detector. If there is any quadrantal weak iron influence visible
with the detector fitted the distance has to be increased. The best distance is the
one where just no longer any influence is visible; add 5 mm to this.
Detector mounted from above
This may be necessary in case the compass is an overhead compass, for example, or
there is already another detector from below. To find the correct distance between detector
and top cover glass, proceed same as above. It is necessary to interchange the green and
grey wire in the junction box.
Adjustment of Detector Alignment
Turn the detector so that the arrow shows in ahead direction of the compass. Now
continue with chapter 2.2) Menu Item “Transmission Error“ and follow the mentioned
procedure.

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4.2) Installation of Junction Box
The junction box allows easy removal of the compass from the binnacle and easy
separation of detector cable.
4.3) Location of Detector and Junction Box within Compass Binnacle:
Binnacle
Compass
Detector Distance Cylinder
Cable with
Connector
Cable
Junction Box
Hood
Attention: Make sure that detector cable does not impair free movement of
compass gimbal and that cables do not obstruct visibility of reflection
reading!

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5) Wiring:
5.1) Power Supply
brown +
green
-
brown +
green
-
5.2) Connection of Junction Box
Connect color to color
green
gray
white
brown
pink
5.3) Connection of Data Output
White Data A
Green Data B
Mains
Emergency

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5.4) Extending / Shortening of Detector Cable
Alteration of detector cable length is possible if the total length does not exceed 35 m.
It is not recommended to disassemble the connectors because often problems are caused
by the small dimensions of the pins. The better way is to cut the cables themselves at a
suitable spot and to use a junction box.
6) Grounding
Although NETcourse has passed EMC qualification tests according to EN 60945, an
accurate grounding is necessary to avoid interferences caused by electromagnetic
radiation like UHF or VHF and electromagnetic pulses (EMP). For example radio telefones
are known to disturb the function of the electronics.
1. For this, fix the casing to the wall steel wall of the superstructure after removing
insulating paint at the rear of the casing and the adjacent wall.
2. If this is not possible use a massive copper wire and fix it on one side at the
grounding screw of the casing and on the other side at the ship´s steel hull. Take
the shortest way.
3. If such a grounding is not possible or not successful proceed as follows: Remove
the plastic insulation of the cables. Do not destroy the screening network below.
Skin the cable abt. 10 mm of length. Bring the skinned part in direct contact to the
ship’s steel. Before, remove insulating paint from the wall. Use a metallic clamp to
fix the cable. One of the grounding points should be as close as possible to where
the cable leads into the superstructure. Choose the second point (if any) as close
as possible to the control unit.
Grounding according to 3.:
10 cm
Skin cable about 10 cm. Remove insulating
paint from the surface below. Use clamp to
press grounding network of cable to metallic
steel of the superstructure.

NETcourse
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www.cassens-plath.de, [email protected]
7) Start-up Procedure
7.1) Check the Power Supply
Check power supply voltage 24 VDC (main- & emergency) with multimeter (ref. to page:
“Pin Connection of Plugs/Connectors”)
7.2) Start Instrument and Check Operation
Switch on the instrument after having completed installation works.
In the display you will see “transmitting”. Now change to menu mode (ref. to chapter “Menu
Mode”) and choose the required data sentence format (ref. to Menu item “Transmission
Protocol”).
7.4) Check of Transmission Accuracy
Check by comparing the heading of the connected unit with the indication of the magnetic
compass. If the difference is too great create a new error table (ref. to Menu item
“Transmission Error“).

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8) Pin Connection of Plugs/Connectors
(As to be seen from rear of casing)
Power Supply (3-pin):
(24VDC, identical for mains & emergency supply)
2) not connected
1) +24VDC (brown) 3) Ground (green)
Detector (5-pin):
3) Reference (white)
2) Exitation2 (pink) 4) Cosine (grey)
1) Exitation1 (brown) 5) Sine (green)
RS-485/ RS-422 Data Output (4-pin):
2) A (white) 3) B (green)
1) not 4) not
connected connected