[C320-list] Data IN ... Data OUT Garmin to AutoHelmST4000Plus

[Jeff Hare]

Have a great time Bruce!  

   The extent of my boating today was to climb over 3 foot snow banks and up
into the cockpit so that I could knock the heavy snow off the boat cover.
Well, in just 5 short months we'll be getting it ready to splash it back in
the water for what amounts to 4.5 short months of sailing.

How Pathetic.
-Jeff


-----Original Message-----
From: c320-list-bounces at catalina320.com
[mailto:c320-list-bounces at catalina320.com] On Behalf Of Bruce Stanley
Sent: Sunday, December 23, 2007 5:48 PM
To: C320-List
Subject: Re: [C320-list] Data IN ... Data OUT Garmin to AutoHelmST4000Plus

Bill
thanks.
I'm off to the boat for a go at this ... we are hoping to do a 150nm trip as
of 27thDec!
It would be great to have the GPS steering to wpts at times!

cheers

Bruce Stanley #1084
Sydney Australia

On Dec 24, 2007 9:37 AM, Bill Culbertson <billculb_a2 at yahoo.com> wrote:

> Jeff is correct, Bruce.  What you are calling the 12v Ground is indeed the
> 12v Ground and it is also the data ground. The data signal voltage on the
> brown wire is relative to the Garmin ground wire.  So without that wire
> connected to the -ve end of the NMEA input of the autopilot, the Garmin
> signal voltage connected to the +ve end of the NMEA has no reference
point.
>
> What can be confusing about the wiring is that the Garmin both sends data
>  and receives data.  So logically the garmin would have six wires.  data
out
> and its gnd, data in and its gnd, 12v and its gnd.  As is customary when
> there is not an electrical reason to keep separate, the Garmin unit uses
the
> single gnd wire for all three gnd purposes.
>
> Garmin     data -> -> -> -> data -> (brown)  -> NMEA + in
>                data <- <- <- <- data <- (white)
>                12V
>                GND    -    -    -    -    -    -    -    -    NMEA - in
>
> Remember Jeff's advice to switch the Garmin unit to NMEA mode from Garmin
> mode.  I forget this nearly every time I bring my 176 back onboard from
> having taken it home to transfer track data to my PC. The PC wants Garmin
> mode, the ST4000 wants NMEA mode.  I've taken to leaving it in NMEA mode.
>  It's less disturbing if my PC won't upload track data then when I'm
onboard
> and the Garmin won't talk to the ST4000.
>
>  -bill
>
> ----- Original Message ----
> From: Bruce Stanley <brucestanley36 at gmail.com>
> To: C320-List <c320-list at catalina320.com>
> Sent: Sunday, December 23, 2007 4:28:47 PM
> Subject: Re: [C320-list] Data IN ... Data OUT Garmin to AutoHelmST4000Plus
>
> Hi Jeff
> Do I read the 2 lines below:
> ----------------------------------------------------------
> Brown Data OUT wire from Garmin  --->  To Raymarine NMEA +
> *GROUND wire* from Garmin cable    --->  To Raymarine NMEA -.
> ----------------------------------------------------------
> to mean that the *"12v" GROUND wire* from the Garmin ---> to Raymarine
> NMEA???????
>
> Bruce Stanley
> Sydney
> ==================================================
> On Dec 24, 2007 6:54 AM, Jeff Hare <catalina at thehares.com> wrote:
> > Hi Bruce,
> >
> >  I probably should have researched this first, but from memory and what
> > you've provided:
> >
> >  Garmin uses a 4 wire cable.  Power +12, NMEA Data IN,  NMEA Data OUT,
> > GROUND (0v)
> >
> > For this application, I believe you'll be using the GARMIN BROWN (Data
> Out),
> > and the Ground wire.
> > On the Raymarine end, I believe you'll connect:
> >
> > Brown Data OUT wire from Garmin  --->  To Raymarine NMEA +
> > GROUND wire from Garmin cable    --->  To Raymarine NMEA -.
> >
> > This effectively TRANSMITS NMEA Sentences From the Garmin to the ray
> marine
> > NMEA Listening port.
> >
> > Since you don't need your GPS LISTENING to NMEA 1083 sentences from the
> > RayMarine autopilot (other sources), you won't use the White DATA IN
> line.
> >
> > Does this make sense?
> >
> > Also, when you set up your Autopilot, you need to be sure that it's
> > listening to NMEA 1083 as well as setting the Garmin transmitting mode
> to
> > NMEA 1083.
> > Usually the Garmin transmits using "GARMIN" protocol, so if you haven't
> > changed that, you'll need to.
> >
> > I hope I got this right, but no harm will come if polarity is reversed
> here,
> > because they're only signal lines.
> >
> > If you need longer runs, standard network cable CAT-5 used for computer
> > networks is just fine for this.
> >
> > -Jeff
> >
> > PS: I believe that you can drive up to 3 NMEA devices from the NMEA 1083
> > output of your Garmin.
> >
> > -----Original Message-----
> > From: c320-list-bounces at catalina320.com
> > [mailto:c320-list-bounces at catalina320.com] On Behalf Of Bruce Stanley
> > Sent: Sunday, December 23, 2007 3:54 AM
> > To: C320-List
> > Subject: [C320-list] Data IN ... Data OUT Garmin to AutoHelmST4000Plus
> >
> >
> > Data IN and Data OUT
> > Can you clarify?
> >
> > Firstly, I have the GarminGPS48 connected to my ST4000+
> > I have 12v power, but
> > "NO DATA".
> >
> > Garmin say:
> > White=Data IN
> > Brown=Data OUT
> >
> > ST4000Plus say:
> > NMEA +, and
> > NMEA -.
> > ==============================================
> > do I connect Garmin "White" to ST4000Plus "NMEA -"        ?????????????
> > ==============================================
> > HELP, PLEASE
> > Have a great Festive Season, tooooooooooo
> >
> > Bruce Stanley
> > C320 #1084
> > Sydney Australia
> >
> > PS I have looked on Garmin and Raymarine sites...2 glasses of Red Wine
> > Later I gave up!
> >
> >
> >
> >
>
>
>
>
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