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Another NMEA question for DSC

Old 09-30-2006, 10:14 PM
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tg
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Default Another NMEA question for DSC

Spent all week installing an LCX 110, a Garmin 3010, and an ICOM 502. Everything works except for the DSC to the ICOM. Both instruction sheets indicate that the NMEA TX (-) and RX (-) go to DC ground. This I took to mean the copper strands that look like a "shield" in the RCA connector wires were NMEA tx/rx (-). I soldered those and went to DC ground. The center pin wires went to blue (Garmin NMEA tx + to ICOM NMEA rx +) and brown ( Garmin NMEA + rx to ICOM NMEA tx +). It no work. Any ideas?
Old 10-01-2006, 12:20 AM
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Default Re: Another NMEA question for DSC

Make sure your Garmin is putting out NMEA 0183 v2.0 and the following sentences:

GGA
GLL
Old 10-01-2006, 06:29 AM
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Default Re: Another NMEA question for DSC

Garmin likes for everything to have a common ground point .
Old 10-01-2006, 08:51 AM
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Default Re: Another NMEA question for DSC

The ICOM instructions say that either ver. 2.0 or 3.01 will work (RMC, GGA, GNS, GLL). Garmin's instructions state that it uses GPGGA and GPGLL among others. ;?

And by common ground, do you mean ground point? That will be a bit difficult to do.
Old 10-01-2006, 11:42 AM
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Default Re: Another NMEA question for DSC

That will be a bit difficult to do.

The grounds have to go somewhere, Garmin likes that to be the same "point". Forget about plus and minus of NMEA wires and connect the colors specified (think data "in" and data "out"), then make sure the unit grounds are common. I have a Garmin 320, 182C, and HS Intrepid+, when I hooked the black negative wires (each unit has only one) to the same bus the units all started talking to each other ...
Old 10-01-2006, 01:06 PM
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Default Re: Another NMEA question for DSC

The data wires are all connected correctly. All the antenna and units work fine. The difficulty I mentioned has to do with T-top legs and running wires. I can do it if that's all it is. I just don't see why the negative buss in the ebox wouldn't work as well as the negative buss under the console, it's all tied together. And the ICOM has more than one ground wire....that's part of the problem, I think. Each RCA plug (there are two) has an NMEA tx/rx- that needs to go to ground. ;?
Old 10-02-2006, 01:49 PM
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Default Re: Another NMEA question for DSC

My DSC will only work on my Icom 402 if I set my Lowrance to transmit NMEA at 4800 bps. Anything above that will not be received by the Icom... Make sure your Garmin isn't sending it out too fast...
Old 10-02-2006, 02:17 PM
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Default Re: Another NMEA question for DSC

TG ......Here you go ...... VHF Red/GPS BlueVHF White/GPS BrownImportant Note: See Page43 of your ICOM 502A Owners Manual for diagramOuter Conductor (shiled wire) acts a ground wires from VHF Red & VHF White NMEAwires. Those wires have to be stripped &the outer conductorconnnected to a ground source for the VHF/GPS NMEA connections to work correctly. The black common ground wire (that is connected in conjunction with the red power wire) on the Garmin3010 acts as a common ground source for he 3010's NMEA connections.
Old 10-02-2006, 10:05 PM
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Default Re: Another NMEA question for DSC

"VHF Red/GPS Blue

VHF White/GPS Brown"


This part is done.

"Outer Conductor (shiled wire) acts a ground wires from VHF Red & VHF White NMEA wires. Those wires have to be stripped & the outer conductor connnected to a ground source for the VHF/GPS NMEA connections to work correctly."

This part is done.

"The black common ground wire (that is connected in conjunction with the red power wire) on the Garmin 3010 acts as a common ground source for he 3010's NMEA connections."

So all NMEA connections affiliated with Garmin need to be connected at the same ground point? I'll try it....but does anyone have an explanation as to why any ground won't work?

Old 10-03-2006, 12:50 AM
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Default Re: Another NMEA question for DSC

funny i was just outside at 11:30pm working on the exact same problem. i had everything connected correctly after checking about 50 times. I couldn't get the garmin 498 and icom 502 to talk to each other. I read the instruction book for the garmin again and realized you have to go to the system tab in the menu and then go to comm tab and set the serial to nmea in/out. worked perfectly after doing that.
Old 10-03-2006, 06:44 PM
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Default Re: Another NMEA question for DSC

Ladies and gentlemen, we have a winner!!!! Success was absolutely correct. Mine now works correctly. Sure glad SOMEONE around here reads the instruction manual.

Of course I reserve the right to change my mind and eat crow if I find that I have to move the ground point to a common source in the future.
Old 10-03-2006, 06:52 PM
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Default Re: Another NMEA question for DSC

i got eaten by mosquitos while doing this. if i had only read the book about an hour sooner

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