hmm, you bought the thing already?

Phil Stanton wrote:
First the good news

Cracked it

The so called NEMA output from a Raymarine Multi should be floating, but the
positive terminal is at 12v; something to do with being able to use the NMEA
out terminals for an alarm. This as it were "shorts out" the RS232 on the
laptop

Now the bad news

You need a RayMarine PC/SeaTalk.NMEA Interface (E85001). Cost about £100.
Yet another RayMarine Con, but it solved the problem

Phil


I don't get it, didn't you say earlier you already got a converter that
would convert the RS-422 NMEA output to RS-232?

-- Kees

"Quee Queg" wrote in message
...
Phil Stanton wrote:
First the good news

Cracked it

The so called NEMA output from a Raymarine Multi should be floating, but
the
positive terminal is at 12v; something to do with being able to use the
NMEA
out terminals for an alarm. This as it were "shorts out" the RS232 on
the
laptop

Now the bad news

You need a RayMarine PC/SeaTalk.NMEA Interface (E85001). Cost about
£100.
Yet another RayMarine Con, but it solved the problem

Phil


I don't get it, didn't you say earlier you already got a converter that
would convert the RS-422 NMEA output to RS-232?

That would still be a problem, since a real RS-422 input has two signal
lines that should be eachother's opposite in level. With the Raymarine
configuration this will not work. Only when the converter has an
opto-coupler input, as specified in the NMEA standard, it would have worked.

Meindert

Tried the OptoCoupler route, but that didn't work



I was under the misapprehension that when the RayMarine ST60 Multi has 2
pairs of terminals marked MNEA In and NMEA Out, that's what you got.
Yes I got so frustrated that I bought their interface as it was costing me a
fortune in time trying to get some sense. The technical department at
Raymarine didn't come up with the solution although it must be pretty common
problem.

Mind the are not very helpful when it comes to their echo sounders either. I
have a lifting keel boat and want to set the offset so that the echo sounder
reads zero with the keel down and just scraping the bottom. Trouble is when
I half lift the keel and go into shallower water I want the echo sounder to
show a negative amount. Of course it just continues to show zero. Yes - I
know I can set it below water line etc, but it's nice to know if the echo
sounder says 1.5m that is actually the "spare" water kicking around under
you, and you don't have to do a calculation. Most of the boats I sail on are
calibrated this way, so its what you see is what you get none of this
business that on John's boat you deduct 1.4 from the depth shown, whilst on
Pets boat deduct 1.8. (We English East Coast sailors are grateful to have
0.3m under us)


"Meindert Sprang" wrote in message
...
"Quee Queg" wrote in message
...
Phil Stanton wrote:
First the good news

Cracked it

The so called NEMA output from a Raymarine Multi should be floating,
but
the
positive terminal is at 12v; something to do with being able to use the
NMEA
out terminals for an alarm. This as it were "shorts out" the RS232 on
the
laptop

Now the bad news

You need a RayMarine PC/SeaTalk.NMEA Interface (E85001). Cost about
£100.
Yet another RayMarine Con, but it solved the problem

Phil


I don't get it, didn't you say earlier you already got a converter that
would convert the RS-422 NMEA output to RS-232?

That would still be a problem, since a real RS-422 input has two signal
lines that should be eachother's opposite in level. With the Raymarine
configuration this will not work. Only when the converter has an
opto-coupler input, as specified in the NMEA standard, it would have
worked.

Meindert