New cable to plotter on SO 439

[wolferich]

I recently upgraded the plotter on my SO 439 from Garmin 4010 to Garmin 8412. As most of the data goes nmea 2000 all funtions go well. Only my Standard Horizon 1500 VHF doesn’t receive the position data anymore  as it wworks based on nmea 0183. Due to changed connectors on the plotter I need to install a new cable and I don't know exactly how to do it.

The VHF is installed at the navigation desk, the plotter is installed at the end of the cockpit table in a Scanstrut box. Can someone explain me where the cable go from the navigation desk to the cockpit table respectivly where the access points are so that I can place the new cable?

[ohana]

Hi, I have run a few cables now from the chart table to the cockpit table on my 2012  SO439. The best route I have found is as follows. My 439 is the twin aft cabin version.

Remove the plastic trim panels inside the cockpit table, this will reveal the stainless steel cable conduit tube which takes cables to the port aft cabin below. You will need to remove the ceiling panels below. Run the cable down this tube then aft into the steering quadrant area then outboard above the autopilot ram. 

you then have 2 options - first option is to take the cable into the aft cockpit locker at this high level, then re-enter the aft cabin area at a lower level to bring the cable forward under the berth panels, beside the diesel tank ( you will see this is a route used by jeanneau for other cables). however my preferred option here is to remove the thin ply panel to the outboard side of the berth, below the shelf, and run the cable forward through this void. This saves taking the cable into the aft cockpit locker and is a shorter neater route. This panel is held in place with a small trim at the aft end and a couple of screws low down, easy enough to remove. 

next take the cable under the aft cabin clothes lockers - you will need to remove a couple of thin ply panels in the forward clothes locker to do this. This will allow you to take the cable into the main heads area, where there are other jeanneau installed cables to follow. You will see where these cables track through to the chart table, just follow these. 

Hope this helps 

[Trevor]

Hello wolferich,

Congratulation of the new MFD. Now that is a beautiful plotter.

If you already have a cable from the plotter to the VHF, why can’t you simply reconfigure the cable at the plotter end to suit the plotter? Get the cable and work out which pairs are for transmission and reception of the data and terminate those into the appropriate connector. All the work could be done at the plotter end of the cable which would save a LOT of work.

Maybe I missed something in the original post so please let me know if I have missed the point.

Kind regards

Trevor

[wolferich]

Thanks to Ohana and Trevor. Both your comments are exactely what I was asking myself.  Way for a cable from the navigation desk all the  to the plotter seems challenging. I will look deeper in it the next time I go to the boat but I am not the best friend of small screws and their plastic covers.

Therefore the alternative to make all changes at the plotter end with the existing cable sounds better to me and, noTrevor, you got everything perfectly well. Is it correct than I need a preconfigured cable from Garmin with the necessary plug on one side and open cable ends at the other end. Is it enough to connect Rx and Tx cables , 4 connections in total, or does it need more connections?

[Trevor]

If I understand correctly you would like your radio to show the position. In other words the position data available at the chart plotter needs to be sent to the radio. I am guessing the radio is not sending any AIS data to the plotter.
In that case the TX (transmission) output from the plotter goes to the RX ( receive) input of the radio.

In NMEA0812 one cable pair is dedicated to sending and one pair is dedicated to receiving. In your case however because you are only sending information one way, you only need one pair connected. Each wire in that pair has a polarity. One is + (positive) and one is - (negative). It is important to get that right.

So to make this work you need a connector for the NMEA 0812 output of the Garmin 8412 and connect the correct two pins to the correct two wires in the cable going to your radio.

I will do some research and get back to you.

Regards
Trevor

[Trevor]

The garmin cable required handles audio and NMEA0812 and is part number 010-12852-00. The 8412 has one NMEA0812 port.

The document at this URL outlines the pinouts for the connector on the 8412.

www8.garmin.com/manuals/webhelp/GUID-871DF8A0-D7F0-41CD-BC39-FB7822E19BFB/EN-US/GUID-C4BBAC94-C5E7-452A-8C94-024F88CE763A.html

You can see the NMEA 0183 Tx/B (Out -) is the pink wire and NMEA 0183 Tx/A (Out +) is the grey wire.

On the Standard Horizon 1500 the NMEA 0183 Rx/B (in -) has the green wire and the NMEA 0183 Rx/A (in +)is the blue wire.

I'm not sure what the cable colours are you have from the radio to the plotter but the cables should be connected like this.

Garmin 8412 pink wire to Standard Horizon green wire.
Garmin 8412 grey wire to Standard Horizon blue wire.

Once connected it should work as I think the Garmin factory default is the normal NMEA 0812 data rate (4800 baud).

Good luck with it. I hope it goes well.

Regards,

Trevor

[wolferich]

Trevor, I send you my big thanks. I also found the relevant docs in the meantime but I didn’t bring it to the point like you did. More important, it gives me much more trust if a second pair of eyes had looked into the matter as I am not dealing with such matters regularly.



it will be latest early september when I will next go to my boat  and I will report from there.

Thanks again for all the valuable help Trevor and Ohama. 

[wolferich]

Back from the boat. After good preparation based on the infos given here the connection of the cables was done in half an hour. It can be mentioned that although GARMIN changed the cables/plugs from the older device to the newer, the color codes on signal level were still identic -  grey to grey and pink to pink :-) .

Everything worked as expected from the first test on.

Thanks again for your help.