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Old 16 June 2013, 07:45   #1
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Icom to Garmin NMEA

Hi Guys

I know this sort of question has been covered before so apologises for another post on the subject but none of the previous answers cover the newer icom's and I'm going crazy trying to get my icom M323 radio and Garmin 450s plotter to talk via NMEA.

The icom no longer has the co-ax type connectors on and now has the following four plain wires coming out of the back, no shields:

Brown: Talker B ( data L )
White: Talker A ( data H )
Green: Listener B ( data L )
Yellow: Listener A ( data H )

By my reckoning, it should therefore be:

Garmin Blue to icom Yellow.
Garmin Brown to icom White.
Icom brown and Green not connected to anything.
Garmin serial ports set to NMEA std.

The radio just says "No position, No time". I have reversed yellow and white but still the same. Both GPS and Radio grounds are connected together.

What am I missing?
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Old 16 June 2013, 07:51   #2
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Wire colours should be in the manual but don't forget to turn nmea output signal on in the farming settings menu, then it should work
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Old 16 June 2013, 07:52   #3
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So iPhones turn garmin into farming!
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Old 16 June 2013, 07:55   #4
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perhaps i should sell the RIB and buy a field?
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Old 16 June 2013, 10:17   #5
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If you want your radio to receive position info then you need to connect the two listener wires. The H will be the + wire from the Garmin and the L will be the negative or ground wire. Referred to as high and low these days as most kit now has balanced feeds.
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Old 16 June 2013, 12:38   #6
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I'd have thought yellow and green to the Garmin - you want the Icom to listen...
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Old 17 June 2013, 03:37   #7
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Quote:
Originally Posted by Erin View Post
If you want your radio to receive position info then you need to connect the two listener wires. The H will be the + wire from the Garmin and the L will be the negative or ground wire. Referred to as high and low these days as most kit now has balanced feeds.
I'm sorry but that is complete rubbish! If they are both listening they won't hear anything! in to out or listen to talk.

On the Garmin the wires are as follows:

Blue port 1 out
Brown port 1 in
Black ground

On the Icom it's a bit more complicated as you have two different channels with different outputs:

Quote:
NMEA IN/OUT LEADS
Brown: Talker B (Data-L)
Connects to an NMEA In Negative line of a PC or
NMEA0183 ver. 3.01 sentence format DSC, DSE compatible navigation equipment, to receive position data from
other ships.
White: Talker A (Data-H)
Connects to an NMEA In Positive line of a PC or NMEA0183
ver. 3.01 sentence format DSC, DSE compatible navigation equipment, to receive position data from other ships.
Green: Listener B (Data-L)
Connects to an NMEA Out Negative line of a GPS receiver
for position data.
•A NMEA0183 ver. 2.0 or 3.01 RMC, GGA, GNS, GLL and VTG
sentence format compatible GPS receiver is required. Ask your
dealer about suitable GPS receivers.
Yellow: Listener A (Data-H)
Connects to an NMEA Out Positive line of a GPS receiver
for position data.
•A NMEA0183 ver. 2.0 or 3.01 RMC, GGA, GNS, GLL and VTG
sentence format compatible GPS receiver is required. Ask your
dealer about suitable GPS receivers

If you start with the blue, brown and black on the Garmin and either the white and yellow or the Brown and green with the correct settings on both units you should be fine - don't forget the GPS will need a position before one comes up on the VHF!

Garmin Blue goes to green(b) or yellow(a)
Garmin Brown goes to brown(b) or white(a)
and don't forget to make sure the black wires are all to the same common earth.
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Originally Posted by Zippy
When a boat looks that good who needs tubes!!!
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Old 17 June 2013, 07:01   #8
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Been talking to iCom, very helpful and quick to help so full marks there, but interestingly, the recommendations to me seem at odds to the way it's written in the manual. They say:

For GPS data to the radio:

Icom Yellow to Garmin Blue
Icom Green to Garmin Black / Common Ground

For NMEA data from the radio back to the Garmin:

Garmin Brown to Icom White
Garmin Black / Common Ground to Icom Brown

I'm not near the RIB t'll the weekend but I'll post the outcome when I've tested.
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Old 17 June 2013, 11:05   #9
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I'm sorry but that is complete rubbish! If they are both listening they won't hear anything! in to out or listen to talk.
Badly worded on my part . I meant the two listener wires on the vhf. He seemed to be connecting a listener and a talker to the Garmin output.
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Old 23 June 2013, 04:14   #10
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Tested iCom's instructions yesterday and yes, contrary to the manual which talks about channels A and B etc, it is actually as simple as the following:

For GPS data to the radio:

Icom Yellow to Garmin Blue
Icom Green to Garmin Black / Common Ground

For NMEA data from the radio back to the Garmin:

Garmin Brown to Icom White
Garmin Black / Common Ground to Icom Brown

All working

Thanks for the input from everybody.
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