[time-nuts] Lassen IQ receiver

[Robert Darlington]

Hi Morris,

The $ character should come before every NMEA sentence, and there should be
several of these in each data burst.  You probably can configure these
modules to only have one, and that might be what you're seeing.  Out of the
box the Lassen IQ spits out about 10 lines every second, each beginning with
the $ like this:

$GPGGA,184050.84,3907.3839,N,12102.4772,W,1,05,1.8,00543,M,,,,*33
$GPRMC,184050.84,A,3907.3839,N,12102.4772,W,00.0,000.0,080301,15,E*54
$GPGSA,A,3,24,07,09,26,05,,,,,,,,03.6,01.8,03.1*05
$PMGNST,02.12,3,T,534,05.0,+03327,00*40
$GPGLL,3907.3839,N,12102.4771,W,184051.812,A*2D
$GPGGA,184051.81,3907.3839,N,12102.4771,W,1,05,1.8,00543,M,,,,*34
$GPRMC,184051.81,A,3907.3839,N,12102.4771,W,00.0,000.0,080301,15,E*53
$GPGSA,A,3,24,07,09,26,05,,,,,,,,03.6,01.8,03.1*05
$GPGSV,3,1,08,07,57,045,43,09,48,303,48,04,44,144,,02,39,092,*7F
$GPGSV,3,2,08,24,18,178,44,26,17,230,41,05,13,292,43,08,01,147,*75
$GPGSV,3,3,08,,,,,,,,,,,,,,,,*71
$GPGLL,3907.3840,N,12102.4770,W,184052.812,A*21


This was spit out of a Magellan GPS and found randomly on the net here:
http://www.gpsinformation.org/dale/nmea.htm

Hook up your gps and watch it with Hyperterm or your terminal program of
choice.  It should fire up and start spitting this stuff out.  Can I ask
what you're doing with it?  Just curious.

-Bob


On Sat, Oct 11, 2008 at 5:51 AM, Morris Odell <vilgotch at bigpond.net.au>wrote:

> Thanks again Bob,
>
> Yes, that's what I thought it would do, but It doesn't seem to be so. My
> micro is programmed to identify the beginning of an NMEA string by the $
> character and there's only one per sec. Maybe the second string is
> concatenated onto the first one without the dollar symbol.
>
> Having said all that, in the time between my original post and this one I
> managed to get the TAIP output working and the micro to recognise it so I'm
> a happy man :-)
>
> Morris
>
> > Date: Sat, 11 Oct 2008 00:29:07 -0600
> > From: "Robert Darlington" <rdarlington at gmail.com>
> > Subject: Re: [time-nuts] Lassen IQ receiver
> >>
> > As far as alternating, you'll get the various NMEA strings in the order
> > you
> > choose (and the strings you choose) once a second.  You won't get one,
> > then
> > the other, then back to the first.  It'll be several  all at once, and
> > that
> > block will repeat once a second.  I suppose you could select just the two
> > you want, but they'd come in on the same data burst, repeating once a
> > second.
> >
> > first string
> > second string
> > <1 second pause>
> > first string
> > second string
> > <1 second pause>
> > etc.
> >
> > I don't know for sure if you can have port 1 setup with a particular set
> > of
> > NMEA data strings and port 2 setup with a different set.  Assuming you
> > can't
> > do that (meaning they have to be the same NMEA data), you can probably
> > have
> > both ports spit out everything you'd need and ignore what you don't need
> > in
> > software.
> >
> > -Bob
>
>
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