Terje Mathisen wrote:
I've done some more careful inspection of the Sure GPS comms trace:
It really looks like the GPS does _not_ listen to commands by default,
instead the controlling program sends a solitary '0' char to ask for
"permission to talk".
About 200 ms later the GPS boards drop the CD (Carrier Detect) line, and
then the gps.exe program sends the private NMEA message.
As soon as the ending <CR><LF> arrives the GPS turns CD back on and
restarts the configured NMEA messages.
If this sequence is required by default, then it must also be possible
to turn off such very non-standard GPS behavior, right?
Terje
I've started collecting my info on the board at:
http://wiederlinge.de/cgi-bin/lnwiki.cgi/147
Like to add? ( wiki style )
did you see my link to bt747:
http://www.bt747.org/
slightly opaq java stuff : but some info on sendable string
G!
uwe
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