Actisense NMEA 0183 Bedienungsanleitung PDF herunterladen (Seite 5)

NMEA Data Multiplexer - NDC-4-A & NDC-4-A -USB

Important Notices

Actisense and the Actisense logo are registered trademarks

of Active Research Limited. All rights are reserved. The

contents of this manual may not be transferred or copied

without the expressed written permission of Active

Research Limited. All other trademarks are the property of

their respective owners.

The Actisense NMEA Data Multiplexer / Combiner /

Autoswitch (NDC-4) is intended for use in a marine

environment, primarily for below deck use. If the unit is to

be used in a more severe environment, such use may be

considered misuse under the seller’s warranty.

The Actisense NMEA Data Multiplexer (NDC-4) has been

certied to comply with the European directive for Electro-

Magnetic Compatibility (EN60945), and is appropriately

CE marked. Operation of the unit should be in conjunction

with appropriate CE approved shielded connectors

and cabling used in accordance with the CE directive

EN60945. Any EMC related issues should be reported

to Active Research immediately to allow the company to

rectify or resolve EMC related problems in accordance

with its obligations under EN60945.

If the unit is connected such that compliance failure occurs

beyond the company’s control, the company shall not be

held responsible for compliance failure until suitable EMC

guidelines for connection are seen to have been taken.

Notices

When using this document, keep the following in mind:

The products described in this manual and the specications

thereof may be changed without prior notice. To obtain up-

to-date information and/or specications, contact Active

Research Limited or visit the Actisense website (www.

actisense.com).

Active Research Limited will not be liable for infringement

of copyright, industrial property right, or other rights of a

third party caused by the use of information or drawings

described in this manual.

Active Research Limited will not be held responsible for

any damage to the user that may result from accidents

or any other reasons during operation of the user’s unit

according to this document.

The NDC-4 does not validate the NMEA data it receives

in any way. Neither the NMEA sentence checksum, nor

the data contained within the NMEA sentence is validated.

Therefore, the electronic device(s) supplying the NDC-4

with NMEA data retain(s) the sole responsibility for the

NMEA data’s validity.

Foreword

Actisense recognises that instructions are often skipped,

so we have aimed to write this document in an informative,

yet direct manner that will aid the user. We have tried to

cover all the points a typical user may need to know. Please

read all sections before installing and using the Actisense

NMEA Data Multiplexer product and any related software

programs.

Introduction

The Actisense NMEA Data Multiplexer (NDC-4) product

developed out of the requirement to solve two fundamental

problems with the existing marine industry NMEA 0183

communications standard.

In theory, the NMEA 0183 standard allows any suitably

designed marine electronic device to share its gathered

information with any other device on a vessel. Unfortunately,

there is one very large drawback with this standard - only

one device on a connected network can actually send

data (a single talker), with multiple devices (determined by

the current limit of the sending unit) listening to that data

(multiple listeners).

If the vessel owner has an instrument that ideally requires

the data output of two or more devices, for example a chart

plotter, then the owner has no alternative but to settle on

connecting only the most important device (that which

supplies the most used information), normally that is the

GPS unit. All other devices cannot be used.

What happens if the owner prefers the vessels gyro

compass heading output to that of the GPS, or requires

that the current depth be displayed on the plotted chart to

help avoid the possible case of running the vessel aground

on a shifting sand bank? The NMEA 0183 standard cannot

supply an answer to those questions as it can handle only

one transmitting device.

These two elementary problems can be solved simply and

easily with the Actisense NMEA Data Multiplexer’s very

exible design approach.

Alternately, if the vessel has two or more identical NMEA

devices (e.g. GPS’s or depth sounders) the system

solution could be to use the Actisense NDC-4 as an

NMEA Autoswitch to select the highest priority source.

Full information on the complete Actisense product range

can be found on the Actisense website.

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