NMEA 0183 Garmin Chartplotter -> Raymarine

[ess105]

I am trying to hookup my Garmin Chartplotter with my Raymarine network of instruments. The NMEA cables on my Garmin are labeled TX/A and TX/B. On the Raymarine, the connections are labeled + and -. Does anyone know which way round to connect these? I have found some suggestions by googling but they seem to be contradictory.

[Chuck Baier]

Which Garmin are you using. NMEA is usually data in and out and labeled + or - . Raymarine is Seatalk with NMEA inputs on certain devices so need more info to answer your question.

[s/v Thea]

Chuck,

My garmin chart plotter has two data out lines, that could be what you have there. If so the + should go to either of the TX lines and the - to ground (black?).

I assume you are connecting to the nema input on one of your seatalk devices, as you can't connet nema directly to seatalk without a raymarine interface box.

Doug

[ess105]

I'm using a Garmin 5012. It has a few pairs of TX and RX lines. I am attempting to connect to the NMEA input on the Raymarine device. If the Raymarine -ve needs only be connected to ground then would it be ok to leave free? I'll give this a go when I'm back behind there.

[scotte]

Page 15 of the Garmin 5012 install manual has the exact wiring diagram for what you are trying to do... For connecting with Raymarine equipment you will use the differential diagram, not the single-ended one.

I found the manual at https://buy.garmin.com/shop/store/ma...D=148&pID=6312

[ess105]

Originally Posted by scotte

Page 15 of the Garmin 5012 install manual has the exact wiring diagram for what you are trying to do... For connecting with Raymarine equipment you will use the differential diagram, not the single-ended one.

I found the manual at https://buy.garmin.com/shop/store/ma...D=148&pID=6312

Perfect. The online manual is more informative than my paper one and it's very clear what I had to do. The two units are now connected and data flows. Cool. Thanks.