On Mon, 25 Aug 2014 14:15:10 -0400, "Flying Pig"
wrote:

"Wayne.B" wrote in message
.. .
===

For what it's worth I have about 5 NMEA connections on the boat and
they all work, most of them on the first try. My latest is a NMEA to
USB connection thanks to a nice little interface device:

www.amazon.com/Digital-Yacht-NMEA-Adapter-PC/dp/B004FBKS7K

FWIW, my current GPS is also a digital yacht, 105, no longer made, referred
for me by Raymarine a year ago as none of their current GPS are only NMEA,
and would require an adapter to make work with my gear.

Problem I'm having is data not getting to the MFD when either the computer
is off, or the serial port is disconnected.

Currently waiting for a response from Raymarine as to what might be
suggested by my wire setup...

Congratulations on getting yours working.


I read where the NMEA 0183 protocol supports up to five
listeners for each talker. That tells me one could split
the two wires on the GPS NMEA into five talker(+) and
five talker(-) and connect them to five different devices
or listeners as they are sometimes called.

One faulty listener shouldn't affect the four others that
aren't faulty.

--
Sir Gregory

I read where the NMEA 0183 protocol supports up to five
listeners for each talker. That tells me one could split
the two wires on the GPS NMEA into five talker(+) and
five talker(-) and connect them to five different devices
or listeners as they are sometimes called.

One faulty listener shouldn't affect the four others that
aren't faulty.

--
Sir Gregory



The only talker I have (I'm pretty sure) is the GPS.

It comes through on a single pair, which is then tied to the plotter in/out,
VHF, SSB, autopilot, and computer.

Thus I infer that it should be able to handle it. Indeed, oddly, while it
does manage all 5, with the serial port disconnected (or the computer off),
it won't talk to the plotter.

I'm suspicious of one of the three legs of the RS232 going only to one of
the legs of the autopilot; perhaps without that reference, the autopilot
doesn't feed back into the NMEA or Seatalk system, killing the reference for
the plotter.

More work to do on that, yet...

Don't want to hijack the thread. More later in a new thread.

L8R

Skip

--

Morgan 461 #2
SV Flying Pig KI4MPC
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