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gadgetPool.de :: View topic - Nmea data from tacktick too weak.
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Nmea data from tacktick too weak.
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Post new topic   Reply to topic    gadgetPool.de Forum Index -> Nmea Multiplexer with SeaTalk I/O
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peterh
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Master


Joined: May 17, 2012
Posts: 26

PostPosted: Wed Jan 08, 2014 3:56 pm    Post subject: finally nmea data from tacktick ! Reply with quote

Now i have tested the "solution" to get nmea data out of a tacktic T122.
As reported earlier T122 does not conform to nmea183 ( or rs422 ), it's simply broken.
To solve this i bought a rs232tors485 board from eonkits ( http://www.electrokit.com/rs232-rs485-interface-r.46114 )
The board needs only be half-populated, the MAX232 and d-sub is not needed.

Signal to the max485 is taken from the so called nmea-out+ on the T122 ( it's driving between zero and +4V which is enough).
The kit has an on-board 7805 regulator so it can be supplied from the boats +12V, all needed extra stuff is a cooler for the 7805 ( it will get +60 degrees C if no cooler is mounted). I plan to use the cooler as part of the mounting hardware and mount it on the back if T122.
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wigorex
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Joined: Aug 06, 2013
Posts: 9

PostPosted: Tue Feb 04, 2014 2:16 pm    Post subject: Reply with quote

Hi Peter
I have my Tacktik unit now even by Raymarine, waiting for what it does when it comes back from repair.
In the meantime I've been busy myself thanks to the circuit diagram of Frank to understand the input circuit.
For weak signal sources is the pose significant burden
Therefore, I developed a different version.
The opto-coupler is driven here by a constant current source.
This allows a greater dynamic without placing undue burdens on the source A few pictures from the simulation by LTspice:
Input voltage source ± 10 V, and R with 650 ohms in series.
https://www.dropbox.com/s/fzedgqakw91ztk5/INPUT_VOLTAGE.jpg
In comparison, the current through the transmitter diode.
https://www.dropbox.com/s/mzut8jrdsh0i5mw/OPTO_CURRENT.jpg
I will modify an input of multiplexer accordingly and report whether this change had success.

Ralf
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peterh
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Joined: May 17, 2012
Posts: 26

PostPosted: Sat May 10, 2014 9:29 pm    Post subject: tacktick addendum works fine! Reply with quote

Today we made the first sailtour of the season.
This time i have a working tacktick , i have made a unit that converts the
ttl-ouput from tacktick to rs422.

I have many new features; in my raymarine plotter i have a yellow arrow that
shows the wind on the map. It also shows 3 additional fields in the data-window, true wind, apparent wind and ground wind.

The updated mux software works as a charm, the wind information followed me across a 3 hour tour, everything was working "as intended".

When i get a chance i will test to have the autopilot steer against wind .


Regards
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