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3. party wind transducer for Simrad IS15
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rodstar_2000 View Drop Down
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Joined: 07 October 2014
Location: Brazil
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Points: 2 		Post Options Post Options   Thanks (0) Thanks(0)   Quote rodstar_2000 Quote  Post ReplyReply Direct Link To This Post Posted: 09 October 2014 at 09:56
Hi folks,

here are some photos from Simrad IS15 wind transducer "teardown".

Just popped up the top and the bottom and the show started.

The important thing is: just to wires from the main board to the socket. But the socket has 4 pins. My guess was 2 of them are useless/off.

What are these 2 wires? +tx and -tx? +12v and ground?

the IS15 main parts

Simrad IS15 top sensor


Simrad IS15 bottom sensor. Cut 3 wires for soldering a plug in the future.


Simrad IS15 main board. Just have 2 wires to connect to Roblink (black and red)


Simrad IS15 main board. Roblink wires unplugged.


Simrad IS15 tube internal view. Roblink wires thru the arm tube.


Simrad IS15 main board close


The multi test indicates the following connections:




Edited by rodstar_2000 - 09 October 2014 at 10:24
       _~
    _~ )_)_~
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    _!__!__!_
    \______t/
~~~~~~~~~~~~~ Rodrigo / Brazil
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gord0001a View Drop Down
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Points: 1 		Post Options Post Options   Thanks (0) Thanks(0)   Quote gord0001a Quote  Post ReplyReply Direct Link To This Post Posted: 28 June 2015 at 15:38
I know this thread is long since dead, but I'm hoping their are some IS15 experts kicking around that can help me with a few questions.

I recently picked up an IS15 wind instrument and MHU for $100, and need some help with the wiring. The masthead wiring has bare wires but nothing else. I'm pretty sure I can rig up connectors (unless somebody has spares they'd like to sell!) for the back of the instrument panel, but what I need are pinouts for the MHU and instrument itself. 

Appreciate any assistance! Sorry for the thread jack/zombie thread! :-)

Thanks,
Gord.
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Galbizua View Drop Down
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Joined: 26 July 2025
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Points: 3 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Galbizua Quote  Post ReplyReply Direct Link To This Post Posted: 26 July 2025 at 17:28
Originally posted by PALM PALM wrote:

I have bought the nasamarine.com nmea mast head unit ( http://www.nasamarine.com/proddetail.php?prod=31_NMEA_Masthead ) since my IS15 Wind transducer broke.
The IS15 Wind can read nmea if it has SW revision 1.6. The setting must be changed to nmea=listener. If the IS15 Kombi (speed logg) is connected with roblink to the IS15Wind, it show both true wind and direction.
There was only 2 issues with the installation, first to get the IS15 to read nmea, and then to route the cable from the mast foot to the IS15 Wind.
My installation:
The mast head unit was fixed at the mast top and the cable routed to the mast foot. The cable has 3 connections, 12V feed, ground and nmea out.
The 12V feed did I connect to the unused deck lamp supply (orange). It is also possible to use the supply for the saloon front reading lamp.
I used the two roblink cables for nmea+ and ground to get the signal from the mast foot to the E-panel. In the E-panel I connected this end of the roblink cable to the free unused signal cables routed from E-panel to the IS15 Wind, where it was connected to the nmea port.
The trick to make the IS15 Wind to read the nmea signal is to connect the ground/nmea- to the electric ground somewhere between the mast head unit and the IS15 Wind (the ground voltage level seems a bit high on the internal ground in my IS15 Wind instrument).
With this 125£ solution I will continue to use the Simrad IS15 crap until it die, and then never Simrad again.

Edit 2014-10-03.
I have used this combination, nasamarine.com nmea mast head unit together with IS15 for two seasons now. The combination is working!Thumbs Up

One small issue still to be solved.
The calibration of the nasamarine.com nmea mast head unit is done by:
1. keep the wind vane in Zero-direction,
2. connect blue (signal) cable to ground (black),
3. power upp,
4. release the blue cable from ground.

My IS15 has low resistance between nmea + and - during power up => the nasamarine.com nmea mast head unit is recalibrating at every power up. Confused
I have discussed the issue with nasamarine.com and the solution is to put a pull-up resistor between the nmea mast head unit red (+) and blue (signal) cable. The restior shall be at 10kOhm. This will keep the signal high during power up, but shall not be enough to keep the signal high when the IS15 is up and running.
To be tested during summer 2015. Smile
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Galbizua View Drop Down
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Points: 3 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Galbizua Quote  Post ReplyReply Direct Link To This Post Posted: 26 July 2025 at 17:34
Hello
I made connection like picture
But not work.
It is the nasa marine wind vane with 3 cable 12v red, black -, nmea 183 blue.
I connect the black with black nmea and the blue with the read NMEA but don’t work
I try with different negative but same result 
Any idea?
Thank you
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Galbizua View Drop Down
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Points: 3 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Galbizua Quote  Post ReplyReply Direct Link To This Post Posted: 26 July 2025 at 17:35
I do the same!
Did you solve the problem?
Can you help me
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PALM View Drop Down
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Points: 42 		Post Options Post Options   Thanks (0) Thanks(0)   Quote PALM Quote  Post ReplyReply Direct Link To This Post Posted: 26 July 2025 at 22:52
Hi,
I use the nasamarine nmea0183 wireless mast head unit since many years now. Check the signal with OpenCPN or other SW that can show nmea0183 data. If the data is ok, you check the setting of the SIMRAD unit.
//Petter Almhagen
S/Y Elsanta
Hanse 342 #223
Gothenburg, Sweden
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