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7.0

GPS not found by applications, output ok on Telnet

Asked by eslonim in GIS & GPS Programming, Windows XP Operating System

Tags: GPS NMEA

On a new Dell Latitude E6400, XP, the GPS is on the 5530 cellular card.

It appears to be working fine, NMEA strings appear in Telnet and shown on GPSDIAG program, including fix.

However 2 different "real" applications fail to find the GPS, they get the port (COM7, autobaud), but can't see any GPS NMEA messages on it.

Any ideas?

(Samples of output and program responses in CODE section)


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Sample NMEA Data:
$GPRMC,143944.00,A,3247.429558,N,03459.265575,E,000.0,018.0,040109,,,A*5C
$GPGSV,3,1,09,19,57,234,31,14,56,052,20,32,41,278,20,11,36,312,34*75
$GPGSV,3,2,09,03,32,194,,06,25,182,,22,24,058,,31,20,133,*7F
$GPGSV,3,3,09,20,15,269,,,,,,,,,,,,,*4B
$GPGSA,A$GPGGA,143945.00,3247.429558,N,03459.265575,E,1,04,0.5,295.0,M,,,,*36
,3,11,14,19,32,,,,,,,,,1.1,0.5,1.0*3A
$GPGGA,143946.00,3247.429558,N,03459.265575,E,1,04,0.5,295.0,M,,,,*35
$GPRMC,143946.00,A,3247.429558,N,03459.265575,E,000.0,018.0,040109,,,A*5E
$GPGSV,3,1,09,19,57,234,31,14,56,052,23,32,41,278,22,11,36,312,34*74
$GPGSV,3,2,09,03,32,194,,06,25,182,,22,24,058,,31,20,133,*7F
$GPGSV,3,3,09,20,15,269,,,,,,,,,,,,,*4B
$GPGSA,A$GPGGA,143947.00,3247.429558,N,03459.265575,E,1,04,3.0,295.0,M,,,,*32
 
Messages from programs that fail to detect:
Port COM7: is opened, handle=1584 nTryBaudRateIndex=0
trying baud 38400 for Port COM7:
$GPRMCWe found a valid GPS Receiver on port COM7: baud 38400
Setting CommTimeouts
Setting CommTimeouts SUCCEEDED
Setting NMEA messages frequencies
All PREPS done, starting main loop
Bytes transfered is 0!
Bytes transfered is 0!
Bytes transfered is 0! ....
 
or similarly from the other program:
Checking COM7 4800: no output detected.
Checking COM7 9600: no output detected.
Checking COM7 1200: no output detected.
Checking COM7 19200: no output detected.
Checking COM7 38400: no output detected.
 
So they appear to see the GPS, but not recognize the sentences?
[+][-]01/17/09 10:39 PM, ID: 23403997Accepted Solution

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About this solution

Zones: GIS & GPS Programming, Windows XP Operating System
Tags: GPS NMEA
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Solution Provided By: eslonim
Participating Experts: 2
Solution Grade: A
 
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