OMC-131 True wind display
Meteorological Applications
Installation & technical users’ manual
Version 1.14
TDC April 2017 updated to firmware v3.5
OMC-131 True wind display Users’ manual
V1.14
Page 2 TDC-April-2017
Index
INDEX .............................................................................................................................................. 2
1. GENERAL ................................................................................................................................... 4
2. INSTALLATION .......................................................................................................................... 6
2.1. MECHANICAL ............................................................................................................................................ 6
2.2. ELECTRICAL ............................................................................................................................................. 6
2.2.1 General system layout .................................................................................................................... 6
2.2.2 Power supply settings ..................................................................................................................... 7
2.2.3 Connections .................................................................................................................................... 8
2.2.4 I/O Ports ........................................................................................................................................ 9
2.2.5 Input jumper settings Port 1 ............................................................................................................ 9
2.2.6 Output jumper settings .................................................................................................................... 9
2.2.7 Jumper settings port 2 – 4 ............................................................................................................. 10
2.2.8 Serial input Port 1: Wind sensor (Portside) input ........................................................................ 11
2.2.9 Serial input Port 2: Wind sensor (Starboard) or speed log (VHW) input ..................................... 11
2.2.10 Serial input Port 3: Gyro (HDT) or combined heading & speed (VHW) ..................................... 11
2.2.11 Serial input Port 4: GPS (GGA & VTG) .................................................................................... 12
2.2.12 Serial input output Port 5 ............................................................................................................ 13
2.2.13 Analogue input output Port 6 ...................................................................................................... 14
3. COMMISSIONING ..................................................................................................................... 16
3.1 WIND SENSORS RELATIVE WIND INFORMATION .......................................................................................... 16
3.2 TRUE WIND INFORMATION ........................................................................................................................ 17
3.3 COMMUNICATION AND PORTS .................................................................................................................. 18
3.3.7 Message format ............................................................................................................................ 19
3.4 FUNCTIONS VIA FRONT PANEL .................................................................................................................. 20
3.4.1 Units and averaging settings ........................................................................................................ 20
3.4.2 Lamp test....................................................................................................................................... 20
3.4.3 Gust reset ...................................................................................................................................... 20
3.4.4 Vessel Heading & Speed information ............................................................................................ 20
3.4.5 Status led’s GPS & Gyro ............................................................................................................... 20
4. MAINTENANCE ........................................................................................................................ 21
5. SETTING UP PROCEDURE ..................................................................................................... 22
5.1 INPUT DEVICE ......................................................................................................................................... 23
5.2 SET OUTPUT DEVICE ............................................................................................................................... 26
5.3 SET AVERAGE OF CHANNELS ................................................................................................................... 27
5.4 SET OPTIONS .......................................................................................................................................... 27
5.5 ALL SETTINGS ......................................................................................................................................... 28
OMC-131 True wind display Users’ manual
V1.14
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Version history
1.13 Correction in text on page 16: Starboard and Portside where exchanged.
1.14 Added comment page 4 concerning gust display & Gust reset description page 20.
OMC-131 True wind display Users’ manual
V1.14
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1. General
The Observator Instruments OMC-131 True wind display unit is specially designed for easily read out
of true and relative wind information on board sea going vessels. Once again the use of the latest
Observator Instruments standards in combination with a distinguished front panel, known from earlier
released wind displays like OMC-139, the unit will be a breakthrough in the marine navigation market.
The unit is suitable for panel mounting as well for mounting into a standard 19" rack, on request a
table top version is also available. Any inclination is allowed and no additional control units are
required.
For proper use, this unit requires, besides a wind speed and direction signal, a GPS, Gyro and
speed log signals. These are necessary for calculating true wind and direction for normal situations
as well as situations such as turning at low speeds.
Relative wind direction and variation is indicated within a circle relative to the longitudinal axis of the
vessel, while the true wind information is displayed within a wind circle with the four wind directions.
Inside these circles which consist of 36 LEDs, numeric displays indicates the corresponding rela- tive
and true wind speed. This information can be displayed in m/s, knots, mph, km/h or Beaufort.
Selection of these units can easily made using the MENU option within the integrated membrane
keys. Another MENU option is the choice of the averaging interval, which can be set at 2 minutes,
10 minutes or every other user-programmed interval. When not in the MENU mode the arrow
keys are used for brightness control or gust reset.
A gust display is located in the lower right of the relative wind circle. It will display the maximum gust over
the selected interval time or - when the interval is set to ‘user’ - the maximum since last reset.
The minimum gust is not selectable since it is not implemented in this firmware.
On the lower right of the true wind circle a 3 digit display is available for indication of the numeric
wind direction.
The true wind display unit was specially developed for integration within meteorological systems
used for nautical applications. Therefore many in- and output connections belong to the possibilities,
either as standard or as option. The unit was primary intended to use with the Observator
Instruments OMC-160 wind sensors, but other, most common sensors can be connected to the
system.
Of course the connection with all other Observator Instruments equipment like meteorological
data monitoring software, data printers and ’slave’ display units belong to the possibilities using
the Observator Instruments standard output.
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Mechanical
Case type : 19 inch front plate 3HU
Material : Aluminum
Max. dimensions : 493x143x90mm
Panel out cut : 432x132 mm
Weight : 2.5 kg
Electrical
Power Supply : 230 VAC/50-60Hz (+/-10%) (Optional 115 VAC & 24VDC)
Power Consumption : 50 VA
E.M.C. : EN-50081-1 (emission) and EN-50082-2 (immunity)
Fuses: : Glass fuses 5x20 mm (all Slow Type)
- 250mA for 230 Vac
- 500mA for 115 Vac,
- 630mA for 24 Vdc
Input
Sensor Supply : 15 VDC, max. 100 mA
Signal : NMEA (RS422) or TTY, (300 - 9600Bd)
Compatibility : All Observator Instruments equipment, wind sensors,
displays etc. GPS : RS422 NMEA-0183 (GGA + VTG)
GYRO : RS422 NMEA-0183 (HDT)
LOG : RS422 NMEA-0183 (VHW) or 200 pulses per nautical mile
Combined Heading - Speed : RS422 NMEA-0183 (VHW)
Output
Daisy chain : TTY, (passive) to other Observator Instruments display units or RS422
: NMEA MWV (T, R & M)
RS-232 Communication & programming
Connector : DB9-M
User interval : 1 ... 600 sec.
Gust reset : automatic or manual
Display
Averaging interval : 2 min, 10 min, or any user-programmed interval, selectable from
front panel. The selected interval is valid for direction, variation,
speed, and gust.
User interval : programming via RS-232 communications port
Readout units : m/s, km/h, kts, mph, bft, selectable from front panel
Selection GPS, Gyro/Log : Automatic or manual, on front panel LED indication what selection is
made
Front panel control : 3 keys, marked MENU, and
Brightness control : from front panel with and keys (16 steps)
Lamp test : from front panel by simultaneously pressing and keys
Manual gust reset : from front panel by simultaneously pressing MENU and key
Available Options
: 115VAC Po wer Supply
: 24 VDC Power Supply
: RS-232 signal output (Observator Instruments data format)
: RS-232 or RS-422/RS485 signal output (NMEA-0183 data format)
: Analog outputs 0-1 V or 4-20 mA
: Signal input RS-232 (Observator Instruments data format, modem
connection)
: Signal Input for non-Observator Instruments Sensors: contact factory
: Remote brightness control
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2. Installation
2.1. Mechanical
Panel mounting of the OMC-131 display requires a panel cut-out of 435mm x 130mm. Maximum
panel thickness 5 mm. Rear access must be provided, for fixing of the tightening clamps and
connecting the electric cabling. The depth of the unit is 63 mm and an additional clearance of 8 mm
should be allowed for the cable connections.
2.2. Electrical
All Observator Instruments displays utilize a common terminal strip for the connections to the wind
sensors and the ancillary displays and/or recorders. The signal cable between the wind sensor and
the display is a 4-core cable with 2 cores for power to the sensor and 2 cores for signal transmission.
To reduce interference the cable must have a common screen. This screen should be grounded to
earth in the junction box of the wind sensor. In this way the cable may run distances up to 1
kilometer.
Recommended cable: 2 (or 3) twisted pairs with common screen, core size 0.75 mm2.
In the case that the wind sensor is provided with a heater. 2 extra cores are required for power
supply to the heater. The size of the heater cable depends on the cable length. (For more details
see manual wind sensor)
The OMC-131 display unit provides the 15 Volts DC. power supply to the microprocessor transmitter
in the wind sensor. The power consumption of the sensor transmitter electronics is approx. 65 mA.
This power supply should not be used for the optional heaters in the sensor. These sensor-heaters
must be powered independently from the display unit.
2.2.1 General system layout
Cable layout depends strongly on the customer requirements.
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2.2.2 Power supply settings
The OMC-131 will be delivered with the power supply set as required by the customer. If no power
supply is mentioned in the official ordering papers the OMC-131 power supply will be set for 230
Vac.
If during installation is found that the supply setting is wrong two things can be done, the unit can
be returned to the factory for modification or the user will modify the unit himself.
To modify the display unit for a different power supply proceed as follows,
On the power supply board, the PCB with the terminal connection on the rear side, there is installed
a transformer. The transformer offers the possibility of 115 or 230 Vac. The supply depends on the
jumper settings between the filter transformer and the supply transformer. (See PCB layout) If the
wired marked "B" are installed the unit is set for 115 Vac, If the wire "A" is installed the unit is set for
230 Vac.
For 24 Vdc power supply the transformer TR1 has to be removed from the printed circuit board.
When the transformer has been removed two wire connection can be made (marked with "C")
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2.2.3 Connections
All connections to the OMC-131 display are made to the rear of the display as shown on the
drawing below.
If the Observator Instruments wind sensors are used, the terminals 1. 2. 3, and 4 are used for sensor 1
and the numbers 7, 8, 9 and 10 for sensor number 2.
1, 7, 13, 19 = -15 Vdc sensor supply
2, 8, 14, 20 = +15 Vdc sensor supply
3, 9, 15, 21 = - serial currentloop input, or RS422 input*
4, 10, 16, 22 = + serial currentloop input, or RS422 input*
5 = - output currentloop or RS422*
6 = + output currentloop or RS422*
11, 17, 23 = - output RS422
12, 18, 24 = + output RS422
28,29 = remote brightness control or 200 ppm log or manual selection wind sensor
30 = not used
31 = not used
32 = not used
33 = - analogue speed output 4..20 or 0..1(0) Volt**
34 = + analogue speed output 4..20 or 0.. 1(0) Volt**
35 = - analogue direction output 4..20 mA or 0.. 1(0) Volt**
36 = + analogue direction output 4..20 mA or 0.. 1(0) Volt**
* Default = RS422
** Optional (requires OMC-127 analogue output kit), default is 4-20mA
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2.2.4 I/O Ports
The OMC-131 has 5 serial I/O ports & 2 analogue outputs available:
Port
4-20mA
0 .. 1 V
0 .. 10 V
Function
6
output 1
x x x
Wind speed: True / Relative
output 2
x x x
Win direction: True / Relative
* All relevant NMEA messages is all the data required for a slave OMC-131 to work (Input port 1 of a slave
OMC-131 will be connected to output port 4 of another OMC-131).
2.2.5 Input jumper settings Port 1
Port number 1 has jumper settings on the connection board as well as on the
processor board. On the connection board jumper field J1 is used to select
Currentloop or RS422.
J1 jumper position 1-3 and 2-4 = Currentloop input
J1 jumper position 3-5 and 4-6 = RS422 input
On the processor board (right) the following jumper field is used,
J1 jumper position 1-2 = Currentloop input
J1 jumper position 2-3 = RS422 input
J1 jumper position 4-5 = RS485 input (n/a)
The default settings for port 2 are RS422 input 4800 baud.
Input Port is always used for input of wind speed and direction information.
Information can be accepted from several different sensors depending of
settings in hardware and software.
2.2.6 Output jumper settings
Port number 1 has only jumper settings on the connection board:
Port
RS422
CL
RS232
Function
1
input
x x
Wind sensor 1 ( Portside) / Combined NMEA (Slave mode)*
output
x x
Wind: OMC-160 / OMC-2900 / NMEA MWV T,R,M / NMEA MWV R
2
input
x x
Wind sensor 2 (Starboard) / Log NMEA VHW
output
x
NMEA MWV T,R, M
3
input
x x
Gyro: NMEA HDT / Combined heading speed: NMEA VHW
output
x
NMEA MWV T,R, M
4
input
x x
GPS: NMEA GGA & VTG
output
x
NMEA MWV T,R, M / All relevant NMEA (Master)*
5
input
x
N/A
output
x
NMEA MWV T,R, M / All relevant NMEA
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