Raymarine GPS Receiver NMEA Multiplexer User Guide

NMEA Multiplexer  
Owner’s Handbook  
Document Number: 81250-1  
Date: February 2005  
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i
Preface  
Congratulations on having bought a Raymarine NMEA  
Multiplexer. This enables you to combine NMEA outputs from up  
to four devices, to provide a combined output to four other  
devices.  
CAUTION: Electrical safety  
Make sure you have switched off the power supply  
before you start installing this product.  
Important information  
To the best of our knowledge, the information in this handbook was correct  
when it went to press. However, Raymarine cannot accept liability for any  
inaccuracies or omissions it may contain.  
In addition, our policy of continuous product improvement may change  
specifications without notice. Therefore, Raymarine cannot accept liability  
for any differences between the product and this guide.  
EMC Installation Guidelines  
All Raymarine equipment and accessories are designed to the best industry  
standards for use in the recreational marine environment.  
Their design and manufacture conforms to the appropriate Electromagnetic  
Compatibility (EMC) standards, but correct installation is required to ensure  
that performanceisnot compromised. Althougheveryeffort has beentaken  
to ensure that they will perform under all conditions, it is important to  
understand what factors could affect the operation of the product.  
The guidelines given here describe the conditions for optimum EMC  
performance, but it is recognized that it may not be possible to meet all of  
these conditions in all situations. To ensure the best possible conditions for  
EMC performance within the constraints imposed by any location, always  
ensure the maximum separation possible between different items of  
electrical equipment.  
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ii  
For optimumEMC performance, it is recommended that wherever  
possible:  
Raymarine equipment and cables connected to it are:  
Atleast3ft(1m)fromanyequipmenttransmittingorcables carrying  
radio signals e.g. VHF radios, cables and antennas. In the case of SSB  
radios, the distance should be increased to 7 ft (2 m).  
Morethan7ft(2m)fromthepathofaradarbeam.Aradarbeamcan  
normally be assumed to spread 20 degrees above and below the  
radiating element.  
The equipment is supplied from a separate battery from that used for  
engine start. Voltage drops below 10 V in the power supply to our prod-  
ucts, andstarter motortransients, can cause theequipment to reset. This  
will not damage the equipment, but may cause the loss ofsome informa-  
tion and may change the operating mode.  
Raymarine specified cables are used. Cutting and rejoining these cables  
cancompromiseEMCperformanceandmustbeavoidedunlessdoingso  
is detailed in the installation manual.  
If a suppression ferrite is attached to a cable, this ferrite should not be  
removed. If the ferrite needs to be removed during installation itmust be  
reassembled in the same position.  
Suppression Ferrites  
The following illustration shows typical cable suppression ferrites used with  
Raymarine equipment. Always use the ferrites supplied by Raymarine.  
Connections to Other Equipment  
If your Raymarine equipment is to be connected to other equipment using a  
cable not supplied by Raymarine, a suppression ferrite MUST always be  
attached to the cable near the Raymarine unit.  
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iii  
Contents  
Preface ........................................................................................ i  
CAUTION: Electrical safety ........................................i  
Important information ........................................................... i  
EMC Installation Guidelines .................................................. i  
Suppression Ferrites ........................................................ ii  
Connections to Other Equipment .................................... ii  
Introduction ............................................................................... 1  
Inputs & outputs ........................................................................ 1  
NMEA inputs ........................................................................ 2  
Input priorities ................................................................. 2  
NMEA outputs ...................................................................... 2  
Installation ................................................................................ 3  
Mounting ............................................................................. 3  
Connections ......................................................................... 4  
Real-time or buffered inputs ............................................ 4  
NMEA in .......................................................................... 4  
NMEA out ............................................................................. 5  
Power supply ........................................................................ 6  
CAUTION: Electrical Safety ....................................... 7  
Securing cables ..................................................................... 7  
Indicators ................................................................................... 7  
Data indicator lit ................................................................... 7  
Overflow indicator lit ............................................................ 7  
Both indicators lit ................................................................. 8  
Maintenance ............................................................................. 8  
Disposal ..................................................................................... 8  
Specifications ............................................................................ 9  
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iv  
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1
Introduction  
The Raymarine NMEA Multiplexer combines data from up to four  
NMEA-0183 devices to provide a single, multiplexed NMEA  
output.  
Inputs & outputs  
The NMEA Multiplexer has:  
Four NMEA inputs (listener-ports), NMEA In 1, 2, 3 & 4.  
One NMEA output (talker-port), NMEA Out  
One common terminal NMEA Out Com.  
NMEA In 1a  
NMEA In 1b  
NMEA In 2a  
NMEA In 2b  
NMEA In 3a  
NMEA In 3b  
NMEA In 4a  
NMEA In 4b  
NMEA In Shld  
NMEA Out a  
NMEA Out b  
NMEA Out Com  
NMEA Out Shld  
Not used  
PWR +12/24V  
GND  
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2
NMEA inputs  
Each NMEA in (listener) port is a differential pair across  
terminals a and b, and can receive NMEA data from one device.  
The speed of each listener port is fixed at 4800 baud.  
NMEA data on listener ports1 and 2 is multiplexed in real time  
(i.e. unbuffered).  
NMEA data on listener portsNMEA In 3 and 4 is fed via a  
discrete buffer for each port. Each buffer holds approximately  
2 seconds of NMEA data.  
Input priorities  
Data at the listener ports is prioritized, so that each NMEA in  
port is read twice as often as the next one. Thus for example, data  
atinput 1isreadintwiceasoften asdataat input 2, fourtimes as  
often as input 3 and eight times more often than input 4.  
NMEA outputs  
The NMEAOut(talker)portisadifferentialpairacrossterminals  
aand b, and feeds multiplexed NMEA data from all the NMEA  
inputs, to up to four products.  
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3
Installation  
Mounting  
As the NMEA Multiplexer is not waterproof, it must be fitted in a  
location where it will not come into contact with water.  
Secure the NMEA Multiplexer to a suitable surface, as shown in  
the following illustration.  
Place the NMEA Multiplexer at  
the intended location and mark  
holes for fixing screws.  
1.  
Drill two 1/8"(3.4 mm) pilot  
holes for NMEA Multiplexer  
screws.  
2.  
Data  
O
verflow  
NMEA-0183 Multiplex  
er  
Secure the NMEA  
Multiplexer with the  
screws provided.  
3.  
Countersink pilot holes to  
prevent damage to the  
mounting surface.  
4.  
D
ata  
O
verflow  
NMEA-0183 Multi  
plex  
er  
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4
Connections  
Real-time or buffered inputs  
Before connecting NMEA inputs to your NMEA Multiplexer,  
consider whether they should be connected as real time or  
buffered inputs:  
Data running at a fast rate and consisting of single sentences,  
particularly time-critical data, should be connected to either  
NMEA In 1 or NMEA In2, real time inputs. This includes  
data from devices such as Fast Heading Sensors, and Fluxgate  
Compasses. When data is processed in real time, some sen-  
tences may be lost, but the timing of the data is maintained  
and there is no time delay. These inputs will store only one  
NMEA sentence at a time, and thus prevent unwanted delays.  
Slower data that is input as a burst should be connected to  
either NMEA In 3 or NMEA In 4, as buffered inputs. This  
includes data such as GPS, route and depth information, for  
which thetimingis less critical. Theseinputscanstoremultiple  
sentences (12 to 70, depending on length). This is necessary  
for devices such as GPS, which can output 10 sentences at  
once, every 1 or 2 seconds.  
NMEA in  
Connect an unused pair of NMEA In a and b terminals on the  
NMEA Multiplexer to the NMEA output port of each device from  
which you wish to receive NMEA data. The manner in which the  
connections are made depends on whether the device has a  
differential or single ended output, as follows:  
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5
Device with  
differential NMEA output  
& shield connection  
Cable  
shield  
NMEA Multiplexer  
NMEA out +  
NMEA out -  
Shield  
NMEA In a  
NMEA In b  
Device with  
differential NMEA output  
but no shield connection  
Cable  
shield  
NMEA Multiplexer  
NMEA out +  
NMEA out -  
NMEA In a  
NMEA In b  
Shld  
Note: NMEA outputs from Raymarine products are differential.  
Cable  
shield  
Device with  
single-ended NMEA output  
NMEA Multiplexer  
NMEA out +  
NMEA In a  
NMEA In b  
Ground  
NMEA out  
Connect the a and b terminals of the NMEA Out connector to  
the listening ports of up to four devices to which you wish to  
transmit multiplexed data. The manner in which the connections  
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6
are made depends on whether the device has a differential or  
single ended output, as follows:  
Cable  
shield  
Device with  
differential NMEA input  
NMEA Multiplexer  
NMEA in +  
NMEA Out a  
NMEA Out b  
NMEA in -  
Shld  
Note: NMEA inputs on Raymarine products are differential.  
Cable  
shield  
Device with  
single-ended NMEA input  
NMEA Multiplexer  
NMEA Out a  
NMEA in +  
NMEA Out Com  
Ground  
Shld  
Power supply  
The NMEA Multiplexer operates from a dc supply voltage in the  
range 8 V to 30 V and provides protection against reversed  
polarity. It is recommended to connect the NMEA Multiplexer to  
the same powersource orcircuitbreakeras the shipsinstruments  
and/or computer.  
Protect the power supply with a 0.5 A fuse. The wires used to  
connect the power supply must be less than 50 m in length and  
have a total cross-sectional area of at least 0.2 mm2. The  
following examples represent the minimum requirement:  
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7
24 AWG single-strand wire.  
7/0.2 multi-strand wire, i.e. 7 strands, each of 0.2 mm diame-  
ter  
CAUTION: Electrical Safety  
Before connecting power to the NMEA Multiplexer,  
turn off the power supply.  
Connect either a 24 V or 12 V power supply, via a 0.5 A fuse, as  
follows:  
NMEA Multiplexer  
0.5 A fuse  
+12 V or +24 V  
0 V  
PWR +12/24V  
GND  
Securing cables  
When you have connected all cables, use appropriate cable ties  
and/or clamps to make sure the cables are physically secure and  
cannot be accidentally pulled from their connectors.  
Indicators  
Data indicator lit  
Agreen DataLED blinkswhenvalidNMEAdataisreceivedat the  
listener ports, to indicate satisfactory connection and polarity of  
the connected device. The Data LED will not blink if the input  
polarity is reversed.  
Overflow indicator lit  
A red Overflow LED indicates a buffer overflow, i.e. that more  
data is coming in than can be transmitted. When a buffer is full,  
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8
partially received sentences will be discarded, to ensure that the  
NMEA Multiplexer only passes complete and valid sentences.  
You may be able to resolve this overflow situation if you:  
Set up the devices on the listener ports to send less data or  
data at greater intervals. If possible, disable non-relevant sen-  
tences.  
Swap the input devices to different listener ports.  
Both indicators lit  
Both LED s will blink once when power is applied to the NMEA  
Multiplexer. If the red LED stays lit, this indicates that a hardware  
error was found during self-test.  
Maintenance  
There are no user-serviceable parts inside the Raymarine NMEA  
Multiplexer. However periodically check to ensure that the  
connections to it are secure, and that the condition of the  
connecting cables is satisfactory.  
Disposal  
When you want to dispose of this product, do so in accordance  
with local regulations.  
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9
Specifications  
Supply voltage:  
8 V to 30 V dc, protected against reversed  
polarity.  
Supply protection:  
Supply connection:  
0.5 A fuse  
Minimum requirement either:  
24 AWG single-strand wire.  
or  
7/0.2 multi-strand wire.  
Current consumption:  
Inputs:  
70 mA maximum, with fully loaded talker ports.  
4 x NMEA-183, galvanically isolated.  
>800 Ohm.  
Input resistance:  
Outputs:  
1 x NMEA-183.  
Buffers:  
2 buffers of 1000 characters (NMEA In 3 and  
NMEA In 4 only).  
NMEA Out:  
Combined data from NMEA inputs.  
4800 baud.  
Speed NMEA in:  
Speed NMEA out:  
Indicators:  
4800 baud.  
Overflowand Data LEDs.  
138 x 72 x 33 mm.  
Dimensions:  
Housing:  
Flame retardant ABS.  
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10  
Raymarine UK Ltd,  
Raymarine Inc,  
Quay Point,  
22 Cotton Road,  
Unit D, Nashua,  
New Hampshire 03063-4219,  
USA.  
Tel: +1 603.881.5200  
Fax: +1 603.864.4756  
Northarbour Road  
Portsmouth,  
Hampshire PO6 3TD,  
United Kingdom.  
Tel: +44 (0) 23 9269 3611  
Fax: +44 (0) 23 9269 4642  
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