Smart Systems User’s Manual Version 1.1
83
Baud Rate
The baud rate is the speed that data is sent from the GPS receiver to the serial port of
the DVL. The available options are: 2400, 4800, 9600 (default) or 19200.
Stop Bits
The available settings for Stop Bits are: 1 (default) or 2.
Data Bits
The available settings for Data Bits are: 7 or 8 (default).
Parity
The available settings for Parity are: none (default), odd or even.
End String
The GPS receiver can be set up to send one or more types of data strings. These
strings are called NMEA-0183 strings and each contains positional or other information
in specific formats. Each type of string is specified by a 5-character prefix. There are
numerous NMEA strings but examples of three different NMEA strings (GPGGA,
GPVTG and GPGSA) are shown below.
$GPGGA,134713.00,4338.221086,N,07938.421365,W,2,06,2.1,152.51,M,-35.09,M,5.0,0118*79
$GPVTG,34.0,T,,,001.4,N,002.5,K,D*70
$GPGSA,A,3,30,26,10,13,24,06,,,,,,,4.2,2.1,3.6*36
$GPGGA,134713.00,4338.221086,N,07938.421365,W,2,06,2.1,152.51,M,-35.09,M,5.0,0118*79
$GPVTG,34.0,T,,,001.4,N,002.5,K,D*70
$GPGSA,A,3,30,26,10,13,24,06,,,,,,,4.2,2.1,3.6*36
$GPGGA,134713.00,4338.221086,N,07938.421365,W,2,06,2.1,152.51,M,-35.09,M,5.0,0118*79
$GPVTG,34.0,T,,,001.4,N,002.5,K,D*70
$GPGSA,A,3,30,26,10,13,24,06,,,,,,,4.2,2.1,3.6*36
$GPGGA,134713.00,4338.221086,N,07938.421365,W,2,06,2.1,152.51,M,-35.09,M,5.0,0118*79
$GPVTG,34.0,T,,,001.4,N,002.5,K,D*70
$GPGSA,A,3,30,26,10,13,24,06,,,,,,,4.2,2.1,3.6*36
Before using the GPS with the Noggin
plus
, the DVL software needs to know the prefix of
the LAST string being sent in each group. In the example above, three strings are being
sent each time (GPGGA, GPVTG and GPGSA). Since GPGSA is the last one being
sent in each group, the End String needs to be specified as GPGSA.
To see what the End String is for your particular GPS, run System Test #1 and note the
first 5 characters on the last line after each series of strings is written to the screen.
These are the 5 characters that need to be filled in under End String.
The End String option allows the user to fill in the 5 character GPS prefix. Use the Left
and Right buttons to move left or right to different characters in the string. The currently
selected character will have an “^” under it. To change the letter of the current
character, use the Next button to change it to the next letter in the alphabet and the
Previous button to change it to the previous letter in the alphabet. Using these keys all 5
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