nmea multiplexer

[steve28]

Last year another forumite posted a project for a nmea multiplexer, i am now in the position where i need one.
I am unable to find the post relating to this so i am asking if anyone else happed to save the details.

steve

 

[pvb]

Raymarine recommend these...

Raymarine recommend multiplexers from NoLand Engineering and ShipModul, so it's fairly certain these products will work OK.

 

[npf1]

Re: Raymarine recommend these...

A company call Brookhouse also makes them

 

[FullCircle]

Re: Raymarine recommend these...

I have investigated Brookhouse, and their range is very adaptable to different layouts - but they are not answering their e-mail on the website. I was asking who the UK agent is?
They are a lot cheaper than the Raymarine equiv.

Please let me nkow.

 

[AlexL]

do you mean a multiplexer or expander?
A multiplexer takes many NMEA data streams in and puts them all together on a single data stream - v. complicated and not really DIYable unless you can do wonders with microcontrollers and embedded software. An expander takes a single NMEA data stream in and rebroadcasts it on multiple outputs, so that a GPS for example can talk to loads of different 'listeners'
I did a DIY expander last year - the ciruit diagram is around somewhere if you need it.
you could try these people for multiplexers http://www.shipmodul.com/en/index.html

 

[steve28]

i need to multiplex the signals, 2 talkers and 4 listeners

 

[Richard_M]

Got a multiplexer from Shipmodul last year. Works fine so far!

 

[steve28]

Which of the distributers did you use, they seem to be all around 160.00 seems way overpriced for what it is.

steve

 

[qetoo]

Both multiplexers and expanders are described at:

http://www.capjack.com/catalog/categoryGP.asp

 

[JerryHawkins]

Actisense is another company to look at

They make various electronic bits including nmea multiplexers.

Have a look at their web site:

http://www.actisense.com/

Cheers,

Jerry

 

[philip_stevens]

Steve,
there was a post in June last year about an NMEA Amplifier. Is this what you are after??

If so, try this link http://home.btconnect.com/jeff.penfold/Alex_Lyne/nmea_amp.pdf

If this doesn't work, I have a copy of it on my computer that I can send you if you PM me your email addy.

 

[Richard_M]

Got it from Mariner Computers, Gosport. Can't remember how much I paid though.

Richard

 

[bedouin]

What are you actually trying to achieve?

I've thought a lot about this - the complexity is in knowing which occurrences of which sentences to drop in order to fit your quart into a pint pot.

For any given application this is comparatively easy - to do it in the general case is much more complex, and would require fairly powerful computation in the multiplexer that would significantly increase the hardware complexity and cost.

 

[wiggy]

I would quite like details of a DIY expander can you pm me details

 

[steve28]

I have a raymarine rn300 gps,a ds400x fishfinder,and st1000+, wind instrument and laptop.

If i use the gps and wind together with autopilot in windtrim it works fine, if i turn the fishfinder or laptop on the wind info dissapears, turn them off and its back.

the way i see it there is too much talking and not enough listening or the talkers are too loud /forums/images/graemlins/smile.gif



steve

 

[bedouin]

NMEA is strictly one talker per circuit - any more than that then you are very lucky if it works at all.

In my present set up I have a switch to select whether the autohelm receives wind data or gps data, but not both. I can't see that it is useful to feed the fishfinder data into the autohelm, so that can be ruled out.

If your laptop is a central part of the system then you could use that as the multiplexer - which would make the task a good deal simpler.

 

[Aeolus_IV]

ShipModul

Me too .. easy to install, worked first time. Pretty good price too, though perhaps not the cheapest certainly far from the most expensive. They have a range of connectivity options for connection to a PC (ie blue tooth etc)

Regards, Jeff.

 

[tome]

How?

 

[hightech]

Try here for Actisense and Shipmodul

Hightech

 

[Richard_H]

Re: Multiplexing

If your still struggling try this contact he was a great help to me Ian Stevens................ ians@alstholmventry.com or 07801 353738
Best wishes