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Connecting multiple devices via NMEA 0183...

Old 07-17-2006, 09:16 PM
  #1  
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Default Connecting multiple devices via NMEA 0183...

I am trying to figure out if this will work. I have a Lowrance LCX-25c which has NMEA 0183 output + and - wires. I want to be able to use the GPS, waypoint, speed, etc. values calculated by the 25c to provide data to my SmartCraft gauges, my ICOM 402 radio, my Raymarine Autopilot, and my Raytheon 21xx radar. All of these items have NMEA receive + and - wires. Can I run the output + from the 25c to a common bus block and attach all of the receive +'s to the block; then run the output - from the 25c to another bus block and attach all of the receive -'s to that block? Will that work properly? Any help would be greatly appreciated.... I've got to get all of these devices talking to each other!
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Old 07-17-2006, 10:31 PM
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Default Re: Connecting multiple devices via NMEA 0183...

I believe the rule is 1 talker to 3 listeners. A multiplexer / expander is the way to go for more than 3 listeners.

That said, you should review your requirements

The radar is only interested in heading data. Where is that coming from ? Depending on your A/P, you may be able to output heading data via NMEA to the radar
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Old 07-18-2006, 02:03 AM
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Default Re: Connecting multiple devices via NMEA 0183...

The radar is only interested in heading data. Where is that coming from ? Depending on your A/P, you may be able to output heading data via NMEA to the radar
Good point, wasn't really thinking about the heading data. I can get that from the autopilot heading sensor's nmea out. I'll have to get out the manuals to see if it will include all of the heading and navigation info out from the a/p to the radar... I think I'm more confused now than when I started

Thanks for the info, guys.
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Old 07-18-2006, 02:42 AM
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Default Re: Connecting multiple devices via NMEA 0183...

My Garmin 2006c says a max of 3 devices on the NMEA output. Check with Lowrance, they can tell you the max number of divices you're allowed if it's not in the manual.
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