User's Manual

pulseEKKO PRO 3-System Setup Parameters

$GPGSA,A,3,04,30,10,13,24,06,,,,,,,3.2,2.4,2.1*32

$GPGGA,134301.00,4338.192559,N,07938.449176,W,2,06,2.4,153.17,M,-35.09,M,5.0,0118*7A

$GPVTG,314.4,T,,,000.6,N,001.1,K,D*41

$GPGSA,A,3,04,30,10,13,24,06,,,,,,,3.2,2.4,2.1*32

3.3.4.2 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. Often, the baud rate for GPS units is 4800. If

you are having a problem getting the GPS to work with the DVL, the Baud Rate is the most likely problem.

3.3.4.3 Stop Bits

The available settings for Stop Bits are: 1 (default) or 2.

3.3.4.4 Data Bits

The available settings for Data Bits are: 7 or 8 (default).

3.3.4.5 Parity

The available settings for Parity are: none (default), odd or even.

3.3.4.6 Last NMEA 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 GPR, 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 Test GPS with Listing 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 Last NMEA String.

The Last NMEA String option allows the user to fill in the necessary 5 character GPS prefix. Use the

numbered buttons to change the letters forward in the alphabet. Use the Change Direction button make

the letters go backward in the alphabet.

See the GPS Receiver User’s Guide for details on how to set up the receiver to output specific NMEA

strings or groups of NMEA strings.