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Old 01 February 2009, 17:33   #11
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oops, yes typo, should read white/orange-white for port 1

Have you tried looking at the data coming out of the radio with a laptop??

The 5000 series units have an engineering mode where NMEA can be shown on screen, but cannot remember how you get to it, will ask Garmin and let you know.
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Old 01 February 2009, 18:39   #12
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Way beyond my level of expertise! Thanks for looking into it for me though.
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Old 01 February 2009, 19:05   #13
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Just a thought, we had this conversation before.

The dual colour, ie. orange/white etc, has to be connected to ground for the 5012 to operate in the mode you require. Be sure the screen of the 505 is a good ground connection.

Presuming you're using port 1; what you should actually have is the data out from the 505 connected to the white of the 5012 and the black data ground of your 5012 connected to the screen of the 505. This is your data path. Then the dual colour wire for that port (orange/white) is connected to ground to switch the 5012 into the mode you require. (Unbalanced connection.) If the orange/white wire is not connected to ground, the 5012 port will function in the balanced mode.

For the 5012, data ground and real ground (battery negative) need to be connected together. This will also have the effect of ensuring the 505 screen is a good ground.
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Old 03 February 2009, 10:49   #14
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my plotter turned out not to support it (Garmin 168, same as a 162) if wired correctly your 5012 should work, however.

thats my short, i hope helpful reply.
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Old 03 February 2009, 12:34   #15
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Thanks JW

I might have the boat in the workshop over the weekend and look a bit further into it. In the meantime I need to find a spare hour or 3 to try and digest all this technical info, it's starting to make my brain hurt!
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Old 21 February 2011, 05:00   #16
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Originally Posted by jwalker View Post
Presuming you're using port 1; what you should actually have is the data out from the 505 connected to the white of the 5012 and the black data ground of your 5012 connected to the screen of the 505. This is your data path. Then the dual colour wire for that port (orange/white) is connected to ground to switch the 5012 into the mode you require. (Unbalanced connection.) If the orange/white wire is not connected to ground, the 5012 port will function in the balanced mode.
Just in case anyone drags this up in the future, I have just spoken to Icom and they have advised me that their NMEA ports are 'balanced'. As such, when conencting to modern Garmin with balanced ports, you should not 'ground' any of the wires. Simply connect TX+(A) on VHF to RX+(A) on GPS and TX-(B) to RX-(B) respectively and all should work. Older Garmins are unbalanced and there is no TX- or RX- as such, but instead the ground wire acts as the 'minus' connection. Garmin refer to this older version as 'single ended' devices.

If Icom are correct in what they tell me then JW's wiring method should not be followed.

Having had to understand all this, which took some time, here is a brief explanation.

Balanced (NMEA v2 and up) means that neither wire is technically a ground wire, but the units sense a voltage difference between the pair of wires. If properly manufactured then the ports are opto-isolated from the rest of the electronics, so actually connecting one to ground by accident wouldn't cause any damage. This type is also known as differential NMEA.

Unbalanced (older method mainly NMEA v1) uses one lead as the signal wire TX+ or RX+ and the other is a ground, though confusingly sometimes referred to as TX- or RX-. In this case it is fine to connect the minus wire to ground. This is known as single ended sometimes.

Important thing to remember is that a TX-(B) should never be conencted to ground on a listener. If you see A's and B's in brackets it means you are dealing with differential or balanced NEMA.

All clear? Yeah thought so!

And finally, any AIS NMEA is balanced as it uses 38k baud rate which is only available in recent NEMA versions.
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Old 21 February 2011, 06:22   #17
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I think I might just get you round to rewire my vhf since you know all about it, I still haven't got mine to talk properly

Of course it would only be a 30 second job if Icom got their act together and started using N2K

11 years late is still better than never
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Old 21 February 2011, 07:31   #18
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I think I might just get you round to rewire my vhf since you know all about it
You might want to wait 'til I power mine up. If you see smoke in the east, you may want to reconsider requesting my help
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Old 21 February 2011, 09:23   #19
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You might want to wait 'til I power mine up. If you see smoke in the east, you may want to reconsider requesting my help
How about a dummy run on Tuesday evening? We can wire up a supply to a couple of grams of explosive just to make it interesting*.

Have you wrestled your new plotter away from Martini yet?

Edit: * I am thinking the old board game "Operation" but with a nice marine/IED twist.
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Old 21 February 2011, 10:46   #20
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Have you wrestled your new plotter away from Martini yet?
Yes, and nearly had a hernia at the same time. Heavy old lump isn't it. All nicely mounted now and wiring in progress. Glad I fitted a light inside the console - meant I could work late into the night yesterday. Had to rearrange the dashboard to fit everything on, but looks fairly neat IMHO. Photos may follow!
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