Cable size for NMEA 0183 connection

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paulrossall

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I want to connect up Garmin 12 to Yeoman Plotter to Simrad TP30 Autohelm. Have studied Farnell cables and have found 6 core screened cable diameter CSA 0.22mmsq. Their ref 715244. Does anyone know whether this cable is OK to connect up with? Not useing it for any power supply. If not what should be used?

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I have done something similar to what you intend, and used three core 0.25mmsq (or equiv) screened cable. I only used two cores of it, as that is all I needed for NMEA.

I linked all my deck instruments, Wind, Log, Depth, to the GPS, and also linked the GPS to the Autohelm Interface.

With this arrangement, I can read the deck instruments on the GPS, and feed GPS data to the Autohelm. The only thing I have not yet done, is to feed the Wind data to the Autohelm - that is to come, to be able to sail by wind direction.



<hr width=100% size=1>regards,
Philip
 
After sorting the cable size ( or perhaps before),look at GPS wiring a few days ago.----Nigel _Luther has used telephone socket & plug !

<hr width=100% size=1>jmp
 
Multi-core telephone cable to dual plug telephone box. Allows two connectors in, spare leads for power / etc.

So far works on 'bench', but yet to try on boat .....

But GPS 'techies' advise screened cable ...... I looked at the data cable supplied with my Magellan and took similar !! ie 6 core multi telephone stuff. !!



<hr width=100% size=1>Nigel ...
Bilge Keelers get up further ! I only came - cos they said there was FREE Guinness !
 
Naturally screened is best - but telco wire should be fine, just bear in mind much is single strand. These days I'd suggest using some Cat5 Ethernet cable - nice and flexible, screened pairs, and cheap as chips in offcut lengths (if you need to pay at all). We're forever discarding odd lengths when re-running cables.

Data rates for NMEA are so low (well until NMEA 2003 or whatever finally appears), that the niceties of RS232 dont really matter!

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cross esctional area is not that important. 0.22mm is fine.

Don't use telephone cable or alarm cable or anything like it. Never use single stranded cables on boats, not even for telephone systems!

Cable must be screened and it is wise to ensure that it is routed away from inverters and ignition systems.

If you get stuck, email me, I've always got a drum of 4-core screened started and would be happy to supply it on cut length basis.

Do it properly, bodges only fail when its foggy!

kev

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should be fine. connect the screen on ONE end only, to avoid ground currents. Did you check wether both are differential or both are RS232? Twisted pair is best for differential, but not essential. At the low speed of NMEA 183 almost anything works, but noise emission could be an issue, especially for NAVTEX, so do use the screen.

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