Garmin 545s & Autohelm ST4000 & NMEA - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > On Board > Gear & Maintenance > Electrical Systems
 Not a Member? 
  #1  
Old 04-28-2009
db27513's Avatar
Member
 
Join Date: Dec 2006
Location: North Carolina
Posts: 35
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
db27513 is on a distinguished road
Garmin 545s & Autohelm ST4000 & NMEA

Im trying to connect my 545s to my ST4000. Has anyone done this? The Garmin says to use two wires to connect to a NMEA device: a Blue NMEA out wire (positive), and a ground. The ST4000 labels its NMEA inputs as Data in +ve (a red wire) & Data in -ve (a blue wire).

The problem? Garmin calls its blue wire as positive (RXD+) while Autohelm says the blue wire should be negative. Autohelm also doesnt mention anything about grounding the other lead..

Any clues?

Thanks
Dave in NC
Reply With Quote Share with Facebook
  #2  
Old 04-30-2009
Senior Member
 
Join Date: Aug 2007
Posts: 306
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 8
thekeip is on a distinguished road
NMEA 0183 devices are generally connected as 'talkers' or 'listeners', depending on their function. There are exceptions, but the AP expects to get data from somewhere and is, therefore, a listener...it doesn't produce data. The GPS on the other hand, is primarily an output device...for the purpose you're concerned with, it is a talker, providing data to the AP.
It would be a good thing for you to use a two or three terminal barrier strip to make your NMEA connections. Ignore the colors. Connect the talker's output to the listeners input..(+) to (+); connect the talkers (-) to listeners (-). Initially, don't assume that either (-) is ground.
Howard Keiper
Berkeley
Reply With Quote Share with Facebook
  #3  
Old 04-30-2009
sailingdog's Avatar
Telstar 28
 
Join Date: Mar 2006
Location: New England
Posts: 43,291
Thanks: 0
Thanked 9 Times in 9 Posts
Rep Power: 13
sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice
Dave—

The problem is that Garmin uses the 12 VDC ground as the signal ground. So, to get it to work with the ST4000, you need to connect the Garmin (Blue or Grey) NMEA out wire to the ST4000's RED NMEA+ in wire, and then you have to connect the ST4000's BLUE NMEA- wire to the Garmin's 12 VDC ground.

Be aware you probably need to set the Garmin's serial port to the NMEA 0183 protocol, as they are set to Garmin's proprietary protocol by default IIRC. Set the ports to NMEA 0183, 4800, 8, N, 1.

Quote:
Originally Posted by db27513 View Post
Im trying to connect my 545s to my ST4000. Has anyone done this? The Garmin says to use two wires to connect to a NMEA device: a Blue NMEA out wire (positive), and a ground. The ST4000 labels its NMEA inputs as Data in +ve (a red wire) & Data in -ve (a blue wire).

The problem? Garmin calls its blue wire as positive (RXD+) while Autohelm says the blue wire should be negative. Autohelm also doesnt mention anything about grounding the other lead..

Any clues?

Thanks
Dave in NC
__________________
Sailingdog

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
.

Still—DON'T READ THAT POST AGAIN.

Last edited by sailingdog; 04-30-2009 at 09:54 PM.
Reply With Quote Share with Facebook
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


Similar Threads
Thread Thread Starter Forum Replies Last Post
AutoHelm ST4000 jheitzman Gear & Maintenance 4 09-27-2011 06:01 AM
ST4000 tiller autohelm wild over correction hertfordnc Gear & Maintenance 5 12-15-2008 10:04 AM
Autohelm ST 50 Radar NMEA Interface Box winethief Gear & Maintenance 1 11-17-2008 03:21 PM
Chosing a GPS/Chartplotter brak Gear & Maintenance 15 09-12-2007 06:29 PM
interfacing GPS to Autohelm chuck711 Gear & Maintenance 4 10-28-2003 10:31 AM


All times are GMT -4. The time now is 05:38 PM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012

The SailNet.com store is owned and operated by a company independent of the SailNet.com forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.