nmea multiplexer

[bedouin]

You mean the use of the laptop?

The most complex part of multiplexing signals is the intelligent discarding of repeat information in order to fit the merged sentence stream into the output. I think that is pushing the capabilities of a low-end microcontroller.

With a laptop involved you could mux the 4800 NMEAs into a 19200 (or higher) stream into the PC (you can do with with a single PIC) , use the processing power of the PC to manipulate the data, then stream it out of the PC at 4800

 

[tome]

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you can do with with a single PIC

[/ QUOTE ]

Thanks for the informative, sure it will help many overcome their problems

 

[bedouin]

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Thanks for the informative, sure it will help many overcome their problems

[/ QUOTE ]
Don't mention it /forums/images/graemlins/smile.gif

I'm afraid it's one of those cases where if you don't understand the answer as given then you probably don't have the skills necessary to do it D-I-Y.

If someone is genuinely interested in the approach then I'd be happy to expore the issues in more depth - but somehow I don't thint that includes you Tome /forums/images/graemlins/cool.gif

 

[BlueChip]

Re: Raymarine recommend these...

I used the Brookhouse nmea / seatalk mux unit and had problems with the Seatalk - NMEA conversion. The NMEA mux worked ok I bought it direct and it cost loads of additional money for carriage and import charges
Found their support less than helpful and never got to the bottom of the problem - they denied it existed in spite of logged data proof
Sold it on eBay in the end
Raymarine mux units come up on eBay regularly for about £60

 

[jfkal]

Please PM me I have one which was never installed

 

[steve28]

thanks, sent pm

steve