NMEA data splitter (1 input to 4 outputs) - Electronic Circuits Projects Diagrams Free

Ken B · 26th May 2004, 05:08 PM

Hi,

I have a GPS that sends NMEA-0183 data to my plotter. I want to send it to my radar, auto-pilot, and computer. I can't run more than 2 things from my GPS because adding more devices "load down" the data line. I need a way to "boost" and/or multiplex the line. NMEA data is basically just pulsating DC. As an example of what I need look at www.marinelektronik.se/pdf/lemm1.pdf
I can't afford what they want for it. I was wondering if there was an available schematic that I could make something similar to this?
Thanks

Noggin · 27th May 2004, 03:59 AM

Send it through 2 MAX232 devices rated for more current than the GPS unit can handle. MAX232's are old though, so you should be able to get a newer one that had more channels so you'd only need one. I don't know what they're called though.

In general you'd need the "new MAX232" device and a few caps. Thats about it.

Another option would be simply an OPAMP configured as a voltage follower.

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26th May 2004, 05:08 PM	(permalink)
Ken B	NMEA data splitter (1 input to 4 outputs) Hi, I have a GPS that sends NMEA-0183 data to my plotter. I want to send it to my radar, auto-pilot, and computer. I can't run more than 2 things from my GPS because adding more devices "load down" the data line. I need a way to "boost" and/or multiplex the line. NMEA data is basically just pulsating DC. As an example of what I need look at www.marinelektronik.se/pdf/lemm1.pdf I can't afford what they want for it. I was wondering if there was an available schematic that I could make something similar to this? Thanks

27th May 2004, 03:59 AM	(permalink)
Noggin	Send it through 2 MAX232 devices rated for more current than the GPS unit can handle. MAX232's are old though, so you should be able to get a newer one that had more channels so you'd only need one. I don't know what they're called though. In general you'd need the "new MAX232" device and a few caps. Thats about it. Another option would be simply an OPAMP configured as a voltage follower. __________________ A rectangular bear is just a polar bear after a coordinate transform. -- I dunno who. A recent study shows that research causes cancer in rats. -- I dunno who said that one either.