Re: Talking with USB GPS in VB.Net

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Thanks ***, very interesting DLL; I know the NMEA protocol, but I don't
understand how make the communitaction with the USB port.

I download the GPS Decoder example code, but he send errors, because I don´t
have the MapPoint. Your DLL work with USB or only with serial port?.

Thanks in advance.

Freddy Coal

"Dick Grier" <dick_grierNOSPAM@.msn.com> wrote in message
news:uEFOluZjHHA.5044@xxxxxxxxxxxxxxxxxxxxxxx
Hi,

There is one "standard" GPS protocol, NMEA-0183. This serial protocol is
fairly easy to work with. However, it is even easier if you download
DecodeGPS from my homepage. The DecodeGPS .NET dll is free, and I include
example code. The source code for the dll is in my book (see below),
along with additional information. IMO, you should make sure that your
GPS receiver outputs data using this protocol (commands also may be issued
to the receiver using NMEA-0183, though very few applications require that
the GPS receiver be programmed).

Garmin also has a proprietary binary protocol. It can be used instead of
NMEA-0183. Again, there are very few applications that would require use
of this binary protocol, and it is much more difficult to use than the
ASCII (NMEA-0183) protocol. I suspect that your actual receiver uses the
NMEA protocol by default (and it may not even support the binary one, so
that may not even be an issue).

***

--
Richard Grier, MVP
Hard & Software
Author of Visual Basic Programmer's Guide to Serial Communications, Fourth
Edition,
ISBN 1-890422-28-2 (391 pages, includes CD-ROM). July 2004, Revised March
2006.
See www.hardandsoftware.net for details and contact information.


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