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Wiring Assistance - Garmin VHF 100 (NEMEA 0183) to Garmin 740s

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Wiring Assistance - Garmin VHF 100 (NEMEA 0183) to Garmin 740s

Old 02-24-2013, 05:25 AM
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Default Wiring Assistance - Garmin VHF 100 (NEMEA 0183) to Garmin 740s

RESOLVED WITH THANKS!

Hello there,

I and a professional installer are trying to connect a Garmin VHF 100 which is NEMEA 0183 to a Garmin 740s so that the positioning is automatic and the distress functionality communicates automatically GPS position.

We are struggling with the connection instructions from the VHF 100 manual:

VHF 100 >>>> "Chartplotter"
--------------------------------------------------------
Purple - Rx A (+) >>>> Tx A (+)
Gray - Rx B (-) >>>> Tx B (-)
Blue - Tx A (+) >>>> Rx A (+)
Brown - TX B (-) >>>> Rx B (-)

The above is taken from Page 5 of the below manual for VHF 100.

http://www8.garmin.com/manuals/3064_...structions.pdf

Can someone please help us replace 'Chartplotter" with the actual wires of the 740s?

Last edited by Captain Twice Screwed; 02-24-2013 at 02:05 PM.
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Old 02-24-2013, 05:46 AM
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Purple to Gray

Gray to Common ground

Blue to Purple

Brown to common ground

Note: the 740 uses one single ground wire to your ground source, where as the 100 does not have one single wire ground source. So your gray & brown wires on the 100 have to be connected to the ground source the 740 ground wire is connected to.
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Old 02-24-2013, 09:19 AM
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Originally Posted by Ermoalfa View Post
Hello there,

I and a professional installer are trying to connect a Garmin VHF 100 which is NEMEA 0183 to a Garmin 740s so that the positioning is automatic and the distress functionality communicates automatically GPS position.

We are struggling with the connection instructions from the VHF 100 manual:
As the boat owner, it is perhaps understandable that issues such as this would challenge you. But if a "professional installer" is having ANY difficulty with such a relatively simple task, you need to get a new "professional installer"!


VHF 100 >>>> "Chartplotter"
--------------------------------------------------------
Purple - Rx A (+) >>>> Tx A (+)
Gray - Rx B (-) >>>> Tx B (-)
Blue - Tx A (+) >>>> Rx A (+)
Brown - TX B (-) >>>> Rx B (-)

The above is taken from Page 5 of the below manual for VHF 100.

http://www8.garmin.com/manuals/3064_...structions.pdf

Can someone please help us replace 'Chartplotter" with the actual wires of the 740s?
If you (or your installer) were to also refer to Page 5 of the "GPSMAP 700 Series Installation Instructions" http://static.garmincdn.com/pumac/GP...structions.pdf, and understand that "TX" on one side must always connect to "RX" on the other, it becomes pretty clear:

Code:
GPSMAP 7xx							VHF 100
----------------------------------				----------------------------------
Function			Color				Function			Color
----------			--------				----------			--------
NMEA 0183 TX+	Blue		<----->		NMEA 0183 RX+	Purple
NMEA 0183 RX+	Brown	<----->		NMEA 0183 TX+	Blue
Common Ground	Black	<----->		NMEA 0183 RX-	Gray
						    \--->		NMEA 0183 TX-		Brown
						     \-->		Power Ground		Black
Power In			Red					Power In			Red
(Note: Ideally, the "Power In" lines on each unit should connect to separate breakers, but not to each other. However, they CAN be fed from a common source if absolutely necessary.)


Originally Posted by bluewaterpirate View Post
Purple to Gray
I think you've got this bollixed up. There is NO Purple or Gray on the GPSMAP 7xx side. And tying those two lines together on the VHF 100 side would only short out the NMEA 0183 input.


Note: the 740 uses one single ground wire to your ground source, where as the 100 does not have one single wire ground source. So your gray & brown wires on the 100 have to be connected to the ground source the 740 ground wire is connected to.
This part is correct.



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Old 02-24-2013, 10:33 AM
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Itteldo ... there most assuredly a purple(or as Garmin refers to it as violet) on the 7xx series. Refer to page 4 of the 740 install manual.

In your case a picture is worth a 1000 words. Note the purple (violet) nmea wire from the Garmin 740. This a connection from a 740 to a SH 2100.

Name:  SHGarmin740NMEA.jpg
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My wiring scheme works fine I know I used it on a number installs.
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Old 02-24-2013, 12:10 PM
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Originally Posted by bluewaterpirate View Post
Itteldo ... there most assuredly a purple(or as Garmin refers to it as violet) on the 7xx series. Refer to page 4 of the 740 install manual.
Ahhh... You're using Port #2 on the 7xx. Why?

In any event, referring to Page 5 of that same document, the standard approach is to use Port #1 -- or at least, use it first. And yes, they do mention using the Gray/Violet pair for a second device; so I stand corrected on that point. Still, unless the OP already has another NMEA 0183 device connected to the 740S (which appears to not be the case), the chart I provided earlier would be correct.



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Old 02-24-2013, 01:35 PM
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Makes no difference whether you use port 1 or 2. Next time read the install manual before you post bogus info. That's the bottom line.

Last edited by bluewaterpirate; 02-24-2013 at 03:51 PM.
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Old 02-24-2013, 02:07 PM
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Thanks very very much Tom BWP.

It worked perfectly.

My installer was pressed for time yesterday and couldn't finish the job, but he came today and with your help we did it all in 20 minutes.

He is a 30 year Mercury Marine guy and he is very very good, I can promise you all that.

Thanks once again.
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Old 02-24-2013, 02:20 PM
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Glad you're up and running. Sorry, for the drama just rubbed me wrong.
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Old 02-24-2013, 04:56 PM
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Actually if anybody is looking for a really good Service Tech who comes to your house in the Pinellas County Florida Area please send me a PM.

Thanks,
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Old 02-24-2013, 05:02 PM
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Tom,

I saw this question asked of you quite a while back, but I was unable to locate the item online. In your photo you have the light gauge NMEA wiring connected via a terminal strip... I think you referred to it as a European connector (?)... Where can I find one?

Thanks, Mark
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Old 02-24-2013, 05:12 PM
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Radio Shack .....

You can cut them to the # of connectors needed for your particular install.


http://www.radioshack.com/product/in...Terminal+strip
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Old 02-24-2013, 06:24 PM
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Thank you Tom.
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Old 02-24-2013, 09:55 PM
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Originally Posted by bluewaterpirate View Post
Makes no difference whether you use port 1 or 2. Next time read the install manual before you post bogus info.
I did indeed read the Installation Instructions; even posted a link to it for the OP's benefit. I simply missed the mention of the second NMEA port when commenting on YOUR post. The information I posted was NOT "bogus"; and is in fact the preferred technique, per that same document.

In any event, I'm glad to hear that the OP got his issue straightened out.



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Old 02-25-2013, 05:07 AM
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Me too ....... now on a lighter note it appears the NMEA folks are pushing for standard color coding of wires vendors included.
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Old 02-25-2013, 05:56 AM
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Originally Posted by bluewaterpirate View Post
Purple to Gray

Gray to Common ground

Blue to Purple

Brown to common ground

Note: the 740 uses one single ground wire to your ground source, where as the 100 does not have one single wire ground source. So your gray & brown wires on the 100 have to be connected to the ground source the 740 ground wire is connected to.
I believe that the "Brown" circuit mentioned above is the NMEA TALKER B circuit. I believe this is a differential output. It is generally not a good practice to wire differential output signals to ground. The use of the minus-sign notation (-) confuses many installers.

If the "Brown" circuit is a NMEA TALKER B signal, it should be connected to the corresponding NMEA LISTENER B on the other device. It is unfortunate that many manufacturers have used the wrong notation for the signals and confused installers with the plus-sign (+) and minus-sign (-) markings.

Later an image is shown, and in the image the "Brown" circuit appears to not be connected to ground.

There are endless discussions about interconnecting devices with NMEA-0183, and the inconsistent color codes of the wires, the inconsistent naming of the signals, and the confusing use of plus-sign and minus-sign notations all contribute to confusion.

It is typical for these discussions to become tedious and confusing themselves, which I attribute to the many opportunities for confusion that are present in the situation due to the color, naming, and marking conventions being so inconsistent.
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Old 02-25-2013, 06:04 AM
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Originally Posted by bluewaterpirate View Post
...it appears the NMEA folks are pushing for standard color coding of wires vendors included.
There is a new version 4.10 of the NMEA-0183 standard. It recommends using particular color insulation. Compliance by manufacturers is on a voluntary basis.

NMEA has been describing the signals in terms of "Talker" and "Listener" for a long time, but manufacturer literature tends to invent its own names, like "In" or "Input" or "Rx" for Listener, and "Output" or "Out" or "Tx" for Talker. This also adds to the confusion.

The manufacturers also tend to use single-ended signals instead of differential signals, sometimes using both types on one unit. This also leads to problems in proper interfacing. NMEA-0183 has recommended differential signals for some time. Single-ended signals are seen in older devices, but even new devices still have them, particularly for TALKER circuits (almost wrote "outputs").
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Old 03-22-2017, 09:03 PM
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Thanks bluewaterpirate ..... It took me a while to understand why to ground the (-) TX and (-) RX side. It got my 546s talking to my VHF-100. I found a link that helps explain NMEA-0183 and lists this exact solution in the pitfalls section: https://www.boemarine.com/blogs/news...erfacing-guide
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