Ais to raymarine ST50 instruments

[NigelFortune]

Although quite old my st50 instruments work well and have been trouble free. I have recently bought a Standard Horizon 2200E VHF with AIS outpUt at 48000 bd that I would like to feed into the Seatalk network. I have the NMEA/PC RS 232 interface module that allows me to see whatever is on the Seatalk network. It has a spare Nmea input which I wouldlike to use to get the AIS onto the network. I have not tried it yet but I have a feeling that the Nmea net work runs at 4800 bd and won't like me trying to mix 48000 bd with it. I intend taking the RS232 from the interface box and driving it into a WIFI router as per previous posts and displaying the result on an IPad running Imray charts & instruments. This would give me AIS & Instruments on the iPad. Worst case I can sent the 48000 directly to the WIFI router and miss out on the instruments.

Any comments would be appreciated

Nigel

 

[nigelmercier]

The Standard Horizon GX2200E has two baud rates: AIS at 38400, and GPS & DSC at 4800. There is no such thing as 48000 baud.

What possible use would there be to feeding AIS into a SeaTalk network?

 

[bitbaltic]

What possible use would there be to feeding AIS into a SeaTalk network?

I think he is trying to aggregate his instrument and AIS data inside the SeaTalk network (or at least inside the RS232 interface module, whatever that is) and then beaming it all to a tablet via wifi.

To the OP, as Nigel says there is no such thing as 48000 baud and you are trying to mix baud rates which won't work. I'm not a SeaTalk user but I'd be pretty sure your instruments are 4800 baud and that the interface you have will also tx and rx on 4800.

I imagine your best bet would be a wifi-enabled multiplexer which can interpret then multiplex the seatalk NMEA output (4800) with the 38400 baud AIS, and then do the wifi thingy. Try looking at things like the Shipmodul miniplex-3wi as a starting point. Raymarine may have something appropriate too for all I know, but I don't use their kit. Somebody who does will be along soon

 

[NigelFortune]

Yes sorry 34800 bd. I'm sure I could read the Seatalk data ( instruments) through the Raymarine interface RS232 to the WIFI thingy @ 4800bd to get the data on IPad. It's just that I would have liked all the data including AIS to be WIFI available.
Thanks

 

[Bru]

Working on the assumption that you have the Raymarine E85001 Seatalk <> NMEA interface c/w an RS232 output...

That interface cannot handle NMEA AIS data at the higher baud rate

As already mentioned, the solution is an NMEA multiplexer with WiFi

Shipmodul or (my preference but more expensive) Digital Yacht likely make suitable devices but caveat emptor cos I haven't actually designed exactly that setup and the configuration of the devices would need to be carefully considered

 

[laika]

What Erbas said.

You can't put AIS onto a seatalk bus. Even if seatalk-1 was fast enough to accommodate full speed AIS data, there's no seatalk AIS commands.

I don't have an E85001 (which I also guess that you have) but I've looked at the manual and my interpretation is that stuff that's put into the NMEA-IN will come out the RS232-OUT even if it's not one of the sentences which the E85001 converts to seatalk. So you almost have a good plan, but this interface is fixed at 4800 and your AIS data is 38400.

I assume your "wifi thingy" if you already have one only has one NMEA/serial interface. I seem to remember that AngusMcDoon designed a low cost multiplexer which might have been appropriate to combine the AIS with the output of the E85001 but the YAPP web site seems to have closed. Other solutions will depend on your appetite for DIY hackery.

The vyacht router is relatively cheap and on paper will do exactly what you want (combine seatalk and NMEA and output wifi) although I have no personal experience of it (anyone got one?). If you got one and it worked you could partially fund it by obeying the E85001.
http://vyacht.net