Re: What is the best GPS Plotter to buy
- From: "Peter" <peter_d_wiley@xxxxxxxxxxx>
- Date: 28 Jun 2006 17:58:01 -0700
Larry wrote:
Courtney Thomas <cc.thomas@xxxxxxxxxxxxx> wrote in news:txxog.2765$NP4.139
@newsread1.news.pas.earthlink.net:
Can I connect all this stuff together and if yes, how do you recommend ?
Where is Meindert selling his multiplexers when you need him....(c;
Meindert on the net is the manufacturer of a nice NMEA multiplexer. NMEA
is a very simply, and now archaic, serial data line that can only have ONE
talker talking to a bunch of listeners. Because the Yeoman is a talker,
sending out waypoint data for instance to the other chartplotters on the
network, you'll need a multiplexer with an input port for each talker,
separately. Yeoman, GPS, Compass Sensor, Depth Sounder, etc. Anything
that has data to contribute. Sometimes, you can get a group of same
manufacturer stuff to connect just to one port. Our Seatalk instruments
data all comes out one port on the Raymarine Radar, for instance.
But, on NMEA, you have to have a multiplexer to store the data coming in,
then spit it out, one statement at a time, to all the listeners hooked
together on its output.
NMEA stands for National Marine Electronics Association, IIRC, and
basically defines message data formats and standards for interfacing
marine electronic devices. My copy of the standard is version 3.01
January 2002.
http://www.nmea.org according to the manual, haven't accessed the site
personally.
There are all kinds of ways of doing stuff depending on what you have,
what you want to do and how baroque a solution is acceptable.
We use terminal servers and tcp/ip to avoid all the talker/listener
crap. Just feed each device into a terminal server port and go from
there. This way you can create a gyro heading sentence from a GPS VTG
sentence, for example. Usual caveats apply.
PDW
Meindert has lots of information on NMEA and how to hook it up on:
http://www.shipmodul.com/en/index.html
Peter Bennett does, too:
http://vancouver-webpages.com/peter/
.
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