Serial Interface System RS 422 SYNMET / NAV (SCH 664) - Windaus

Operating Instructions 

Serial Interface System (SCH 664) 

Serial Interface System RS 422 

SYNMET / NAV (SCH 664) 

OPERATING INSTRUCTIONS 

Serial Interface System SYNMET / NAV (SCH 664) 

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List of contents 

1.0 Description 

1.1 General 

1.2 Function 

1.3 Dimensional drawing 

1.4 Technical data 

2.0 Setting into operation 

2.1 Unpacking 

2.2 Choice of installation place 

2.3 Mounting 

2.4 Electrical connection 

2.5 Cable entries 


2.7 Performance check 

3.0 Service and maintenance 

3.1 Periodical works 

3.2 Change of spare parts 

3.3 Spare parts drawing 

3.4 Spare parts list 

3.5 Repair procedures 

3.6 Ordering of spares 

4.0 Setting out of operation 

4.1 Storage 

4.2 Dispatching 

5.0 Remarks



1.0 Description 

1.1 General 

The interface box SYNMET-NAV model SCH 664 is designed to convert up to twelve analogue and 5 digital channels 

(pulse and event) of various meteorological sensors into a digital signal of RS 422 standard with a message format 

according to the NEMA 0183 requirements which are world wide in use for all naval electronic systems. 

Regarding the wind parameters the system in general is measuring the relative data which are influenced by own speed 

and heading of the vessel. As an option the system can be enabled to calculate true wind data when receiving 

corresponding information contained in the "own ship data" or OSD protocol of the NMEA message. 

In the standard version two serial ports COM1 and COM2 are implemented as 1 * RS 422 for continuous data 

transmission and 1 * RS 232c or RS 422 for service and maintenance. On request the system can be extended with an 

option containing four more serial outputs COM3 to COM6 by means of a piggy-back-module. 

All generated digital output signals can used for a transfer to other intelligent peripheral control systems as auto pilot 

devices or others. 

Its is constructed as a primer coated seawater resistant aluminium housing which normally is coated with grey (RAL 

7001) lacquer. The performance of lacquering corresponds to the general demands for military equipment. 

To fulfil the strong EMC/EMI requirements the housing is equipped with conductive rubber sealings and metallic cable 

inlets according to VG 88 812. 

1.2 Functional description of sub-components 

The interface system SCH 664 NMEA (SYNMET-NAV) in general is consisting of the sub-components power supply PS, 

controller-board CPU, sensor interface SI and a motherboard. Corresponding designations are printed on the front 

panels of the boards. 

1.2.1 Sensor interface board SI 

Incoming analogue signals from the sensor first get linked to the sensor interface board SI where an adaptation 

potentiometer for the DC-generator and a DC-DC-module for the supply of the N18-ring potentiometer are located. For 

service purposes it can be set to a corresponding mode by means of a mini-switch on the front panel. 

1.2.2 Controller board CPU 

On the controller board CPU the analogue signals of the SI board get converted with a resolution of 12 bit, evaluated and 

processed from an advanced micro-processor system (controller) NEC V25. A user specific firmware written in "Turbo 

Pascal" carries out the signal processing including plausibility checks, compensation of error effects (e.g. the threshold 

and non-linear behaviour of the cup rotor) and creates user-specific digital message formats (e.g. NMEA 0183) to be 

linked to other equipment. In general the controller starts again automatically after switching on the power supply of the 

system or if firmware errors occurred. Manual resets can be carried out by means of a small push button on the front 

panel. 

1.2.3 Power supply board PS 

The electronically controlled power supply insert PS can be operated in the wide range of 100 to 240 V AC and 

frequencies of 50....60 Hz without any manual configurations. Various LED's are indicating its correct operation. For 

service purposes the AC and DC circuits can be switched independently on & off by means of two micro switches on the 

front panel. 

1.2.4 Digital-to-analogue converter 

An optional digital-to-analogue converter module (DAC piggy-pack) located on the CPU board provides external 

instruments like wind indicators and/or interfaces with corresponding signals of a 0 to 10 volts or 0/4 to 20 mA output. 

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1.3 Control and operation elements 

For the continuous operation of the interface system special manual operations e.g. on a keyboard are not necessary. 

Only for servicing and checks the inserted printed circuit boards are fitted with the green and red control LED's and 

switches as described below (see also the "drawing of front panels" on the following page). 

Sensor interface board - SI 

LED indications: 

(U1/U2) Indicates the presence of the power supply of 12 V DC for the N18-ring potentiometer of the wind sensor or 

other consumers e.g. sensors to be supplied from integrated DC/DC modules of the system. 

(U3) Output U3 is not in use - the LED is off 

(service) Indicates that the switch is set to the service mode - please refer to the switch function as described below 

Switch 

(operation) Effects an event message for internal mean value calculation only in the data acquisition mode of the 

system; in the service position the LED is shining. 

When working as a talker of NMEA 0183 messages the function is not in use for this application 

CPU board - CPU 

LED indicators: 

(DA) Data acquisition LED is indicating the sampling of data from the sensor. Depending on the stipulated 

sampling rate it is flashing up to six times per second. 

(DP) Data processing LED is indicating the generation of NMEA 0183 data protocols. Depending on the 

stipulated transmission rate it is flashing at least once per second. 

Remark: In case of errors the LED will shine constantly or not at all 

Button Reset of the controller system 

Connectors: COM1/COM2 9-pole female sub-D connectors for service and maintenance only 

Power supply board - PS 

LED indicators: 

(AC-power) Power input is connected and switched on 

(DC output) Internal DC supply is switched on 

(+ 5 V) +5 V DC output of the module is present 

(+12 V) +12 V DC output of the module is present 

(-12 V) -12 V output of the module is present 

Remark: For a proper operation of the whole system all indication LED's mentioned her have to be illuminated (on). 

The remaining LED's (solar), (battery charge) and (DC-output) are not in use in this application 

Switches: 

(AC-power) With these items an independent switching of AC input voltage and DC output voltage is possible - 

(DC-output) for operation both have to be in the "On" position.



Figure: Drawing of front panels 

1.4 Dimensional drawing 

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1.5.0 Technical data 

Interface electronic unit No. SCH 664 unit with up to six serial ports available on screw terminals. 

Technical Data: 

Input channels: 12 analogue channels e.g. current, voltage, resistance 

3 digital inputs (frequency) 

2 digital inputs (status) 

- serial ports for intelligent sensors (e.g. barometer) 

Input signals: standardised signals from digital and analogue LAMBRECHT sensors and comparable 

equipment from other manufacturers. 

Outputs: data from various sensors in a message format according to NMEA 0183 

Baudrate: 4 800 (desired value according to NMEA 0183 V 2.30) 

selectable range in configuration mode: 300 to 38 400 

Transmission rate: between 1 and 3 protocols per second 

Operating voltage: 115/230 V, 50-60 Hz 

Power consumption: approx. 30 W 

Housing: seawater resistant aluminium case with separate screw terminal box 

Operating temperatures: -20...+70 °C 

Cable connection: spring terminals 

Cable inlet: cable glands according to VG 88 812 

Weight: app. 10.0 kg depending on integrated options 

Dimensions: 232 x 241 x 220 mm (W x H x D) without cable inlets 

Painting grey, RAL 7001 if not stipulated otherwise 

2.0.0 Setting into operation 

2.1.0 Unpacking 

There are no special handling instructions for removing the interface housing from the original cardboard box. 

2.2.0 Choice of installation place 

As the digital signals of the RS 232c interface can be transmitted over screened cables with a maximum length up to 25 

m, the interface has to be mounted closed to the unit which receives the data (e.g. auto pilot, data distribution box). The 

RS 422 interface signals can be handled less critical as they can be transmitted via cables up to 1000 m. To facilitate 

servicing in case of a defect the interface should be easily accessible. 

2.3.0 Mounting 

The interface electronics are mounted on a flat surface with four stainless steel screws and spring washers (size M5). 

2.4.0 Electrical connection 

The electrical connection must be carried out according to the main wiring diagram of the entire system; you will find it in 

the general part of the system's documentation. To keep the cable inlets watertight special covering material (e.g. 

RAYCHEM shrink tube) is recommended. The shields of all cables have to be connected to the ground plug-in units of 

the cable glands. The earthing screw has to be connected to the ship's ground by means of a green/yellow coloured 

cable and be protected against corrosion with a special acid-free contact grease. 

Important note: To prevent electrical hazards for installation staff and damages due to short circuits, it is absolutely 

necessary to switch off the power supply until the installation is finished. 

Attention: wrong connection may cause a destruction of this and other connected components ! 

2.5.0 Cable entries 

All cables will be linked inside the housing by means of cable glands according to VG standards. The selection of the 

right cable inlet will be carried out according to the project specific bloc diagram respectively the wiring diagram. The 

corresponding positions are clearly illustrated in the discussed drawings. Due to the small amount of these items a 

numbering of them has not been carried out. 

For various outer diameters of the installation cables different sized cable inlets will be delivered together with the item.




After having finished the mechanical and electrical installation the whole cabling should be checked before switching on 

the mains respectively the circuit breaker for the anemometer system. 

Further switches for service purposes are located on the front panels of the boards. Please get sure they are in the ONposition 

for operation. 

Due to some intelligent internal self-check and automatic adjustment routines of the equipment no alignments have to be 

carried out by the user after the first installation or the replacement of any spares. 

Apart from wind sensor heating devices all other power supply of external sensor electronic circuits if required will be 

provided by the in-built DC/DC converters in the system and therefore separate AC converters are not required. 

The controller of the interface system has an automatic self-start routine in order to start it automatically after switching 

on the power. Same process gets in function also after mains failures e.t.c. 

The operation will be indicated by two LED's (designations: DA = data acquisition; DP = data processing) on the front 

panel of the CPU. 

Only in case of strong interference causing software errors the reset button can be pressed in order to re-start the 

internal firmware manually. 

2.7 Performance checks 

First of all it has to be ensured that all three mini-switches on the front-panel are in the on position. The two red LED's on 

the CPU board have to flash in clockwise intervals. 

The measuring values obtained from the external display consoles can be compered with measurements from other 

meteorological sensors on land or from other vessels in the neighbourhood. 

More detailed test procedures about this subject are mentioned in the documentation for factory acceptance test (FAT), 

harbour acceptance test (HAT) and sea acceptance test (SAT). 

More circumference service and maintenance works can be carried out by means of a special simulation and test 

equipment (STE) LAMBRECHT model No. SCH 463 Mark II which is available to be purchased as an option. Details for 

its use are described in an own operation manual. 

In general the procedures have to be carried out at least by two people from the maintenance staff. For the vocal 

communication between the external sensor located on the mast and a wind data display console a pair of portable 

tranceivers (walky-talkies) or similar are recommended. 

2.8 Message format standard 

All meteorological data of our SYNMET-NAV interface system get transmitted to others in a message format according to 

the NMEA 0183 standards which are world-wide in use on civil and naval systems. 

The standardised message is containing of the elements start sign, talker device identifier, sentence formatters, 

measuring value(s), field delimiters, check sums and other signs. 

According to the nomenclature of the National Marine Electronics Association (NMEA) all equipment generating such 

messages is designated as a "talker" whereas the receiving system is called a "listener". 

All project specific data and parameters are described in detail in a separate agreement of the Interface Design 

Specification IDS or a similar document which is signed by the buyer and the manufacturer. 

2.9 Built-in test facility = BITE-facility 

A built-in test (BITE-) facility enables the user to detect various failures of the measuring system in case of malfunctions. 

The designation of faulty values and errors is described in detail in the Interface Design Specification (IDS) Document as 

mentioned above. 

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3.0 Service and maintenance 

3.1 Periodical works 

Apart from periodical checks for damages of the housing, water-tightness and the fixing of the mounting screws no other work 

will be necessary. 

3.2 Change of spare parts 

All spare parts of the interface system listed and illustrated below can be easily removed using a screw driver. 

The printed circuit boards can be pulled out after removing the screws of the housing cover and then their little screws on the 

front panels. 

Before changing any components of the equipment the circuit breaker for the anemometer system has to be switched off and 

all mini-switches on the front panels have to be set to their off-respectively service-positions. 

After the replacement of boards and switching on the mains again the automatic self-start routine starts the controller again 

automatically. Same process gets in function also after mains failures e.t.c. The operation will be indicated by two LED's (designations: 

DA = data acquisition; DP = data processing) on the front panel of the CPU. Manual alignments at potentiometers 

e.t.c. have not to be carried out as several automatic self-calibration routines are done by the internal firmware periodically 

during its operation. 

Only in case of strong interference causing software errors the reset button can be pressed in order to re-start the internal 

firmware manually. 

The re-assembling of the housing parts has to be carried out in reverse order. All screws of the boards have to be fastened 

securely and all switches have to be set to the on-position before closing the housings cover. 

3.3 Spare parts drawing



3.4 Spare parts list 

No. Description PPU Order-No. 

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1 

2 

3 

3.1 

3.2 

4 

Complete interface system SCH 664 

NMEA "SYNMET-NAV" 00.95664.116 011 

Power supply unit "SYNMET-PS" 

Input: 115/230V/60 Hz 

Sensor interface board "SYNMET-SI" with 

2 DC-DC modules for sensor power supply 

CPU-board SYNMET-CPU with two serial 

ports RS 232/RS 422 

4-channel extension module for SYNMET- 

CPU RS 422/485 

8-channel extension module for SYNMET- 

CPU DAC 

overvoltage protection module SYNMET- 

ESD 

1 00.95664. xxx xxx 1) 

1 32.95660.105 0x0 2) 

1 32.95660.107 0x0 2) 

1 32.95660. xxx xxx 2) 

1 32.95660.011 000 3) 

1 32.95660.004 000 3) 

1 32.95661.009 000 3) 

5 ground insert 21x13.6x16.5 12 35.88812.220 004 

6 ground insert 21x10.6x13.5 12 35.88812.220 003 

7 ground insert 21x9x11.5 12 35.88881.220 002 

8 fuse 5 x 20 mm; 2.0 A 2 68.50010.080 000 

8a fuse 5 x 20 mm; 4.0 A 2 68.50010.170 000 

1) "x" refer to label on the instrument (final ordering No. is depending on 

individual configuration) 

2) "x" refer to label on the connector of the printed circuit board (final ordering 

3) option in use on demand 

3.5 Repair procedures 

The fault tracing and service work only should be carried out by skilled maintainers having passed a factory training at 

our facilities or a similar event. 

According to our repair philosophy the smallest replaceable units are printed circuit boards and other items mentioned 

here. 

For repair these items have to be returned to the workshop of the manufacturer LAMBRECHT in Göttingen. The full 

shipping address of our company is mentioned in this booklet. 

Fuses are consumables and can not be repaired. 

3.6 Ordering of spares 

In case of spares as mentioned here are required are required for replacements or to be put on stock the following 

information are required to forward the right spare parts to the customer: 

- name of item and type number 

- ordering number/parts number 

- required quantity 

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- related component or name of higher assembly 

- type of vessel and country of origin 

- reference number of LAMBRECHT wiring diagram designated with the bold letters SKF.... or SWF.... and a 3 or 4-digits 

running number. 

A detailed inquiry containing these information will be appreciated by us for the safe identification of the required item(s) 

and to prevent wrong deliveries. Above mentioned data can be obtained from the designation label and from the spares 

list of this system component. 

3.7 System configuration 

As mentioned in this manual all functional configuration parameters e.g. connected sensors and interface design 

specification data are programmed project-specific according to the stipulated demands in our works before delivery. All 

relevant operational data are stored in non-volatile memory circuits (EPROMS, EEPROMS and battery buffered RAM's) 

in order to keep the memory content also on stock, during shipment and in a switched-off mode of the system. Therefore 

for the user any access to these parameters is not necessary. 

Deliveries of spares will be carried out in that way that all configuration settings will be carried out in our works by skilled 

staff. 

The configuration procedure of the SYNMET-NAV CPU board in our works has been carried out by means of a 

circumference LAMBRECHT software-tool called SYNMET-COMMANDER during production and in the test field of the 

factory. 

4.0 Setting out of Operation 

4.1 Storage 

The interface box SCH 660 should be stored in a clean and dust-free room with temperatures between -40 and 60 øC 

(not condensing) in the original cardboard box or a similar packing. 

4.2 Dispatching 

For shipment we recommend to use the original cardboard box or a similar packing with applicable damping material. 

There is no need to lock any parts during transport. 

5.0 Remarks 

This manual describes the standard design as well as possible options. The respective performance will be stated in the 

specification and/or the documents of the contract. 

Our products are subject to continuous developments. Technical alterations for the technical progress are reserved. 

Quality System certified by DQS according to 

DIN EN ISO 9001 Reg. No. 3748 Specifications subject to change without notice 09.01 

Wilh. Lambrecht GmbH 

Friedländer Weg 65-67 

37085 Göttingen 

Germany 

Tel +49-(0)551-4958-0 

Fax +49-(0)551-4958-312 

E-Mail info@lambrecht.net 

Internet www.lambrecht.net 

In more than 100 countries

Serial Interface System RS 422 SYNMET / NAV (SCH 664) - Windaus

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