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Go Back   SailNet Community > On Board > Gear & Maintenance > Electronics
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  #21  
Old 05-14-2010
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Thanks Norman,

I will try a few things, and will likely wind up with the E85001. I will monitor this thread to see if some young (or old EE) comes up with a circuit idea to tide me over.

Jim
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  #22  
Old 05-15-2010
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(repost in case editing my previous post doesn't count as an update)

A simple circuit for your NMEA-RS232 could be simply an Opto-isolator, with a 1K resistor in series with the input/NMEA side (the Multi itself uses 4 2.2k in parallel in series with a PC357 opto, say 560 ohms) .

The opto collector goes to +12 (with another 1k or so in series for good measure) and the opto emitter goes to RS232 in. You might need resistor to ground (a 10k or so) on RS232, but usually switching from open circuit to +12 would work even without a negative source.

I hope this verbal schematic makes sense, if so it should only cost about $5-10. Good luck (from a middle-aged (I wish) EE).
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  #23  
Old 05-15-2010
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thanks Norman, will let you know how it turns out

Jim
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  #24  
Old 05-22-2010
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Success with ST60 Multi NMEA optoisolator circuit

I have put together a simple output circuit as suggested by Norman and tested it on the boat (see attached JPEG file for diagram).

Some notes – The ST60 Multi’s NMEA out + goes thru a 1K resistor in series with an LED (light emitting diode) which in turn is optically coupled to the transistor section of the optoisolator IC (an NTE3041 - $1.49 @ Fry’s electronics). NMEA – is the return from the LED.

On the PC serial port side (I used a USB Serial adaptor – IOGEAR GUC232A) DTR (data terminal ready – pin 4) provides the +10v power to the circuit (DTR is only positive when the serial port is open – ex. When the application HyperTerminal is connected). A 1K resistor is in series with the collector of the transistor. The emitter is connected to the receive pin of the serial port (RXD pin 2) and in turn goes to another 1K resistor to ground of the serial port (GND pin 5)

I ran my test at 4800 baud and all waveforms and voltage levels looked fine.

The ST60 Multi provided the following NMEA messages every 2 sec (while sitting at the dock in San Francisco Bay with a little under 20 knots of wind).

$IIDBT,005.0,f,001.5,M,000.8,F*18 (depth)

$IIHDG,185,,,15,E*1A (heading)

$IIHDM,185,M*30 (magnetic heading)

$IIMTW,013.4,C*25 (water temp)

$IIMWV,092,R,016.2,K,A*28 (wind speed and angle)

$IIVHW,199,T,184,M,00.00,N,00.00,K*59 (water speed and heading)


So now that I have the electrical interface working it is on to my software projects.

Jim
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nmea 0183 to RS232-optoisolatorcircuit.jpg  
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  #25  
Old 05-28-2010
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It Works

Hello,

Today I went down to the boat with my laptop and cable. I connected the cable to the Standard Horizon radio (just 2 wires), and connected it to my PC. I started Seaclear and enabled AIS display.

It worked. Very easy to do and it would be helpful when sailing at night, in bad weather, etc.

Barry
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  #26  
Old 12-02-2011
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Seems we could wire up one of these to the raymarine nema output and have a bluetooth connection! Only a few bucks on ebay.

http://www.emartee.com/product/41656...%E2%80%94Slave

Last edited by IPM; 12-02-2011 at 08:38 PM.
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  #27  
Old 12-10-2011
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Duckworks - Building a home made Chart Plotter
found this a while ago
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