SH GX 2150 to Garmin 740S

[localboy]

OK. Here goes. I am needing input, guidance, assistance, help...on hooking up the NMEA 183 between each unit at higher speed of 38400 Baud.

The directions on the SH website conflict w/ the SH owner's manual.

SH Manual says: brown wire =NMEA DSC output (-)
SH Website says: brown wire = AIS out (+)

I just want to know, simply, what wires from the radio go to what wires from the Garmin. Is that too much to ask?
Page 4 http://static.garmincdn.com/pumac/GPSMAP720_InstallationInstructions.pdf

http://www.standardhorizon.com/indexVS.cfm?cmd=DisplayProducts&ProdCatID=83&encProdID=A2C2F4EB2A092075389DC4199A79B6C1&DivisionID=3&isArchived=0

RADIO:
BLUE NMEA GPS input (+)
GREEN NMEA GPS input (-)
GRAY NMEA DSC output (+)
BROWN NMEA DSC output (-)

GPS:
BLUE NMEA port 1 out
BROWN MNEA port 1 in
GRAY NMEA port 2 out
VIOLET NMEA port 2 in
GREEN spare
WHITE spare
ORANGE accessory on
YELLOW Alarm low

[nimrod]

Mark,

I have the same setup. Let me check tonight and I'll let you know.

jd

[BrentB]

I would call and email both vendors to verify wires

[localboy]

Thanks, JD.

Brent, I called SH today. I was on hold for 1/2 hour listening to the "your call is important to us...blah, blah, blah" every couple of minutes. I finally just left a msg.

I locked the boat up for the day. It was only frustrating me; I have no patience for wiring and lack advanced degrees in electrical engineering and computer science.

[kennharriet]

Mark, when I did the identical hookup last year I called the Garmin help number. They simply asked what model radio I was connecting to and walked me through it in a few minutes. I was impressed. I'll bet Garmin will take care of you in short order.

[hardee]

Mark, More power to you. You will like the results when you get there. Wish i could help. I had mine put in down at Rogers Marine. They also put in a switch on the hailer circuit so I can switch to either VHF for fog / hailer function. I guess I'm to chicken to get into all those wires. Sure like the outcome though.

Harvey
SleepyC

[localboy]

Thank, Ken. I'll do that. JD will get back to me too. It's another work week, so I won't get around to it until Sat at the earliest anyway.....

[thataway]

If you go to your Standard Horizon 2150 link. At the top, there is a bar which says "description, Packages, accessories, and Files" Click on the Files--which will bring up a page of various chart plotters and how to hook them up.

Go down the first section, and I believe it is the 6th line--which shows a diagram how to hook up the Garmin 400, 500, 700 series to the SH 2150.

[BrentB]

thanks Bob

[journey on]

I'm impressed, Bob. I certainly wouldn't have found that link.

Boris

[Aurelia]

I took a look at the manuals and could make a good guess but you may have already gotten that far. I find it helpful to turn on the unit (GPS especially)) and get familiar with the port/communications settings and where on both units you could look to confirm that the connection is working. Sometimes this is harder in the driveway but twisting the likely culprits together and looking for results is a sure way to find the right combination. It either works or doesn't. Not that you shouldn't used the manuals to narrow your wire choices significantly. I have interfaced three similar combos so far and found the common ground to be the critical factor aside from the data in/out connections.

Greg

[localboy]

I found and posted the link Dr Bob mentions. That is where some of the confusion started. The link is not the same as the manual.

From my first post on this thread:

[Aurelia]

If the radio and gps are powered from the same ground you likely have that part already covered. Connecting the comm wires input to output in either direction will not hurt anything however you mix the colors. The NMEA 0183 is a simple serial comm standard and is very low 0-5 dc volts provided minimal power by the device itself. I would be confident in mixing colors but maybe avoid connecting two outputs to each other. Not that it would blow anything but you can be sure it wouldn't get you anything useful either.

When connecting a radio to GPS for DSC as an example, turn both units on and make sure the GPS is showing a position then try the wires and watch the radio on the "proper screen" to see the coordinates pop up. When they do you know you have it. Apply that logic to your needs and twist away. I actually use a couple of little alligator clip jumper wires for this kind of testing as its easier to do quickly.

Good luck with those tiny wires.... We really need to create a meetup for jobs like this and get three to four owners in the boat with beers and just get it done through sheer will power and collective knowledge.

We could call them C-brat "sessions"

Greg

[thataway]

Where the confusion comes in, is that Garmin uses the ground as the return (-) in the MNEA sentencing.

In the 2100 (which I have) you have to use both of the Garmin ports, and port 2 is sent to 38,000 for AIS.

When you come to the much simpler to hook up Standard Horizon GX 2150, you do as the diagram shows: and only need one port set up:

That is Blue to blue--SH in (+), Garmin out (+)

Gray to Brown-- SH out (+), Gamin in (+).

Green to Black-- The common is (-) for both in and out on both the SH and Garmin--and is connected to black or ground.

So in some ways simple is harder--and the diagram is the way to go, instead of trying to figure out which wire- again because of the Garmin using the ground as the (-).

This way port 1 on Garmin is set as the high speed port--and information both in and out is used by this port, instead of using two ports.

If you test in the driveway, it will help if you are within range of AIS targets to have them show up. (Line of sight on VHF)

[journey on]

Bob, So you're saying both the DH radio and the Garmin doohickey are RS-232, single ended serial lines?

Boris