[C320-list] Data IN ... Data OUT Garmin to AutoHelmST4000Plus
Bruce Stanley
brucestanley36 at gmail.com
Tue Dec 25 00:57:30 PST 2007
Thanks Bill and Jerry
will print out those pointers and give the system a-go as we progress.
Regards
Bruce Stanley
#1084 Sydney Australia
On Dec 24, 2007 11:54 PM, Jerry Brown <jbrown03 at sympatico.ca> wrote:
> Hi
>
> Your problem with not following routes could be the following. The
> Raymarine autohelm is hard programmed not to change course without
> positive
> skipper intervention, hence why it will not just follow a route. The
> argument being that a change of course without observation and
> confirmation
> is potentially dangerous. That begs a few questions but Raymarine seems
> to
> have decided that a straight course for a period at least makes you
> predictable if you are not looking out. Hence the "next WPT?" message.
> On
> my former setup (Garmin 276 C coupled to ST4000), ignoring the message
> simply lead to the boat carrying straight on past the waypoint for as long
> as you could stand the bleeping. I tried it out of curiosity.
>
> Regards and Happy Christmas
>
> Jerry Brown
> Indigo #1137 (Delivered last week. Splash in April I hope)
>
> ----- Original Message -----
> From: "Bill Culbertson" <billculb_a2 at yahoo.com>
> To: "C320-List" <c320-list at catalina320.com>
> Sent: Sunday, December 23, 2007 9:12 PM
> Subject: Re: [C320-list] Data IN ... Data OUT Garmin to AutoHelmST4000Plus
>
>
> > Sounds like a great trip! It definitely helps to have the auto-steering
> > for those kinds of distances.
> >
> > A couple of things that I've noticed with my set up. One - you need to
> > be already on course toward the waypoint with low cross-track error when
> > you engage 'track mode'. Else it will yell and won't engage. For quite
> a
> > while I didn't realize why it wouldn't. Easiest way is to set the goto
> > right before you engage track mode because you'll be at zero XTE at that
> > time. Two (and this could easily be just my setup), I've never been
> able
> > to get it to engage track mode IF I've got the Garmin following a route.
> > Just won't do it. So I follow the route sort of manually. I engage the
> > route and see the next waypoint. Then I disengage the route and set the
> > Garmin to navigate to that particular waypoint. Engage track mode and
> I'm
> > on auto. Have to repeat for the next waypoint. My typical trips only
> > have maybe one waypoint change per hour so this isn't a major headache
> and
> > gives me something to do :). Still, I wish I knew how to resolve that.
> >
> > -bill
> >
> > ----- Original Message ----
> > From: Bruce Stanley <brucestanley36 at gmail.com>
> > To: C320-List <c320-list at catalina320.com>
> > Sent: Sunday, December 23, 2007 5:47:35 PM
> > 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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> >>
> >
> >
> >
> >
> ____________________________________________________________________________________
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>
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