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Old 19-08-2013, 17:37   #1
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Converting RS232 or USB to NMEA or Sea Talk

I have an older AIS Class B system made by ACR and Nauticast. It is designed I believe to work with a windows laptop. It has up to this point worked great with Nobletec software. I recently added a Raymarine C-95 Multi functional display and want to get the AIS data on this unit which is at my helm. The laptop being below I thus far cannot see my AIS data while driving. The AIS unit has an RS232 output, which I currently convert to USB for the computer, but does anyone know a way to get the RS232 data converted to NMEA? My C-95 has the ability to connect to NMEA or SeaTalk.
Thanks,
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Old 19-08-2013, 17:58   #2
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Re: Converting RS232 or USB to NMEA or Sea Talk

it already is nmea. just connect the wire from the ais to the chart plotter... your laptop was reading nmea.

you either need to cut the plug off (if you don't want to use the laptop any more) or buy a serial cable, and plug it in, and cut the other end off, and wire to plotter.
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Old 20-08-2013, 02:40   #3
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Re: Converting RS232 or USB to NMEA or Sea Talk

In this recent thread the poster is connecting an AIS unit with an rs 232 output to a raymarine plotter (though an older one). It works, despite the fact that the physical connection (ie rs232 rather than 422) is not conformant to the later NMEA-0183 standards. The same should go for yours.

Your mission, should you choose to accept it, is to connect the transmit data pin ("TXD", pin 3) on your rs232 connector to "NMEA in +" connection on the plotter and the ground pin ("GND", pin 5) on the rs232 connector to the "NMEA in -" connection which is the pair of the "+" connection you used. Use the input only pair (orange/white and orange/green) if there's no pressing need for bi-directional communication.

You can buy a 9 pin d shell from radio shack and make up a cable, or as smac999 suggested, chop the end off an existing serial cable. If doing the former, use your favourite search engine to find a diagam for "DB9 pinout", but beware that it's easy to get confused between male and female, front and rear views of the connectors. pin 3 is easy to spot though and you've got a 50/50 chance of getting pin 5 the right way round by chance alone. If chopping the end off a pre-made cable, use a multimeter to find out which pin ends up in which wire end.

Anyone else think that raymarine missed a trick by building all this wireless and network stuff into the new plotters, but then neglecting to think that people might find it convenient to send old-style NMEA data over a network rather serial lines?
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Old 20-08-2013, 04:58   #4
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Re: Converting RS232 or USB to NMEA or Sea Talk

Quote:
Originally Posted by muttnik View Post
Anyone else think that raymarine missed a trick by building all this wireless and network stuff into the new plotters, but then neglecting to think that people might find it convenient to send old-style NMEA data over a network rather serial lines?
I think the concept is to force you to purchase all the rest of the equipment that won't network with their new plotters. $$$$$

When I was in Boat Lagoon, Thailand this spring, Octopus Marine had 2 in the box new E140W plotters that were never installed as the owner they were ordered for wanted to have only the latest and greatest equipment installed on the boat. Don't know the details but I understand that in the end he replaced a lot of other components to match his new plotters.

As we already have E140W plotters we had no interest but a great deal for someone who would want them.
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