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I've worked with GPS receivers using NMEA, and it's extremely simple. Standard ASCII text, comma-delimited values, and easy to verify checksums. The only issue I had was that windows kept wanting to set the COM port to 9600 baud, and the 0183 NMEA standards require it to be 4800. Not a biggie once you know that you need to adjust it. I'm sure that NMEA sonar can't work at that low a baud rate, and their are newer standards that talk at a much higher speed. But I'll hazard a guess and say that the communications can be that much more complex. -- NP PS: You can pick up a GPS receiver for cheap just about anywhere on the internet. You can even buy Microsoft's Streets and Trips that comes with one in the box, and have a fun time just playing around with the receiver. > Date: Mon, 29 Oct 2007 16:31:03 -0800 > From: irox@ix.netcom.com > To: personal_submersibles@psubs.org > Subject: [PSUBS-MAILIST] NMEA interface to sonar units. > > > Hi, > > one thing I've been thinking about recently is what type on SONAR > I would like on a sub. So far, the best off the shelf unit I've > seen is from farsounder.com, which comes with a nice 3D interface. > > It seems many of the other off the shelf SONAR units generate > simar data, but the UI that comes with the unit doesn't support > a nice 3D interface. But, if there was some way of connecting > a PC to the unit and the bathometic data extracted, it could be > processed and displayed in 3D on a PC or laptop. > > So, I started to research what standards where avaliable for > interfacing PCs to SONAR units. I finally came across NMEA > (nmea.org) which seems to be what I was looking for. > > Has anybody here had any experience with NMEA standards? > How are they to work with? Anybody talked NMEA to a SONAR > unit before? > > I plan on doing more research (of course!), but at somepoint buy > an NMEA compatible SONAR unit and see what I can download from > it and if it can work in near real time. > > Thanks! > Ian. > > > > > ************************************************************************ > ************************************************************************ > ************************************************************************ > The personal submersibles mailing list complies with the US Federal > CAN-SPAM Act of 2003. Your email address appears in our database > because either you, or someone you know, requested you receive messages > from our organization. > > If you want to be removed from this mailing list simply click on the > link below or send a blank email message to: > removeme-personal_submersibles@psubs.org > > Removal of your email address from this mailing list occurs by an > automated process and should be complete within five minutes of > our server receiving your request. > > PSUBS.ORG > PO Box 53 > Weare, NH 03281 > 603-529-1100 > ************************************************************************ > ************************************************************************ > ************************************************************************ > Climb to the top of the charts! Play Star Shuffle: the word scramble challenge with star power. Play Now! |