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Raymarine NMEA Multiplexer manual

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Table of contents for the manual

  • Page 1

    NMEA Mult iplex er Owner’ s Handbook Docum ent Nu mber: 81 250- 1 Date: F ebrua ry 20 05[...]

  • Page 2

    © Copy right Ray marine (UK ) Ltd 2005[...]

  • Page 3

    i Prefac e Congra tula tions on havin g boug ht a Ra ymarine N MEA Multip lexer . T his e nables you to co mbine NMEA ou tputs f rom up to f our dev ices , to provi de a comb ined output to four other devices. CAUTION : Elec trical safety Make sur e you have swi tched off the po wer supply before you start installi ng this product. Importa nt info [...]

  • Page 4

    ii Fo r opt imum EMC pe rforma nce , it is recomm ended that wherever possible : • Raymarine e quipment and ca bles connected to it are: • At leas t 3 ft (1 m) from any eq uipment tra nsmittin g or cables car rying radio s ignals e .g. VHF ra dios, cable s and anten nas. In the case of S SB radio s, the d istan ce shou ld be increase d to 7 ft [...]

  • Page 5

    iii Contents Preface . ..... ....... ........ ........ ..... ....... ........ ........ ..... ....... ........ ....... .... i CAUTION: Elect rical safety ................. .............. ......... i Impor tant i nforma tion .. ........ ....... ..... ........ ........ ..... ....... ........ . i EMC I nstal lation Gu idelines ........ ........ ..... .[...]

  • Page 6

    iv[...]

  • Page 7

    1 Introduc tion T he R aymar ine NMEA Multip lexe r combi nes dat a from up to four NMEA -018 3 devi ces to prov ide a s ingle , mul tipl exed NMEA outp ut. Inputs & outputs The NMEA Mult iplexer h as: • Fo ur NMEA inputs ( listen er -ports) , NM EA In 1, 2, 3 & 4 . • One NMEA outp ut (talk e r -port), NMEA Out • O ne common term inal[...]

  • Page 8

    2 NMEA i nputs Each NMEA in (liste ner) po rt is a diffe renti al pair acro ss terminal s a and b , an d can r ecei ve NME A dat a from on e dev ice . The speed of ea ch listener port is fixed at 48 00 baud. NMEA da ta on li stener po rts 1 and 2 is mult ipl exed in real time (i.e . un buff ered). NMEA da ta on li stener po rts NMEA In 3 and 4 is f[...]

  • Page 9

    3 Installation Mounting As the NMEA Mu ltipl exer is no t wa terproo f , it mu st be fi tted in a locati on where it will not come i nto con tact wit h water . Sec ure t he NME A Mult iplex er to a sui table s urfac e , as s hown in the fol lowing illustr ation. D7556-1 Data O verflow NMEA-0183 Multiplexer D ata O verflow NMEA-0183 Multi plex er 1.[...]

  • Page 10

    4 Connectio ns Real-tim e or buffer ed inputs B e f or e c o n n e c t i n g N M E A i n p u t s t o yo u r N M E A M u l t ip le x e r , c o n si de r w h e t he r t he y s h o ul d b e c o n n e c t e d a s r e a l t im e o r buff ered inpu ts: • Data run ning at a fast rate an d consi sting of si ngle sen tences, partic ularl y time-c ritica l[...]

  • Page 11

    5 NMEA ou t Connect th e a and b terminals of the NMEA Out connec tor to t h e l i s t e n i n g p o r t s o f u p to f o u r d e v i c e s t o w h i c h y ou wi s h t o tra nsmit mult iplexe d da ta. T he m anner i n whic h th e conn ectio ns NMEA out - NMEA Multiplexer NMEA out + Device with single-ended NMEA output Ground NMEA Multiplexer Note: [...]

  • Page 12

    6 are m ade de pends on w hethe r the devic e has a dif fer entia l or singl e end ed outp ut, as follow s: Pow er s up pl y The NMEA Mu ltiplexer o perates f rom a dc supply volt age in t he range 8 V to 30 V and pro vides pro tecti on again st reve rsed polari ty . It is rec ommende d to conne ct the NMEA Mu ltiple xer to the sam e power source o[...]

  • Page 13

    7 • 24 AWG single-st rand wire . • 7/0 .2 mul ti-stran d wire, i.e. 7 stran ds, each of 0.2 mm diame- ter CA UTIO N: Ele ctri cal Sa fet y Befor e connecting po wer to the N MEA Multiplex er , turn off the power s upply . Connect either a 24 V or 12 V power su pply , via a 0.5 A fuse , as follows : Secu ri ng ca ble s When you have connect ed a[...]

  • Page 14

    8 partia lly rec eived sen tences wil l be disc arded, t o ensure th at the NMEA Multip lexer only pass es co mplet e and val id sent enc es . Y ou may be ab le to re solve this o verflo w situati on if you : • Set up the devices on the l istener ports to send less data or data at greater i nterv als . If possibl e , disable non-rel eva nt sen- t[...]

  • Page 15

    9 Specifications Supply voltag e: 8 V to 30 V d c, protec ted again st revers ed pola rity . Supply protection: 0.5 A fuse Supply connec tion: Minimu m requi rement either: 24 AWG single-s trand wire. or 7/0.2 mu lti-st rand wire . Current cons umption: 70 mA maximum , wit h fully load ed talk er ports . Inputs: 4 x NMEA- 183, g alvani cally isolat[...]

  • Page 16

    10 Raymari ne UK Ltd , Quay Point, Northa rbour Road Por ts m ou th , Hamp shire P O6 3TD , United Kingdom. T el: +44 (0 ) 23 926 9 3611 F ax: +4 4 (0) 2 3 9269 464 2 www .r aymarine .com Raym arin e Inc , 22 Cotton Road, Unit D , Na shua, New Ham pshi re 0306 3-421 9, USA. T el: +1 603.8 81.52 00 F ax: +1 603.864 .4756 www.raym ari ne.com[...]