Garmin GPS 16-HVS Gebrauchsanweisung - Seite 10

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Garmin 16-HVS GPS Receiver

4.1.4 SerialClose

' Sample CR1000 program to read GPS NMEA GPGGA string

Public location, bytes

public GPSData as string * 101 ' $GPGGA string about 57 characters

PUBLIC ParseStr(18) as string * 15

' Aliases allow proper labels in output data tables,

' and when viewing public variables

alias ParseStr(1) = GPGGA

alias ParseStr(2) = TIME

alias ParseStr(3) = LAT

alias ParseStr(4) = HEMINS

alias ParseStr(5) = LONGI

alias ParseStr(6) = HEMIEW

alias ParseStr(7) = QUAL

alias ParseStr(8) = NUMSATS

alias ParseStr(9) = HDP

alias ParseStr(10) = ALTDE

The SerialClose instruction is used to close the serial port. Once closed, the

SerialOpen command must be used before more data can be read.

The CR1000, CR3000, CR800, and CR850 can store data as a string or as a

number. Every time the datalogger stores a string, the size of the string

determines the number of bytes used. If the string was declared to be 101

bytes long, every time the string is written to memory, 101 bytes are used.

Depending on the application, the entire GPGGA string can be stored to

memory or just specific parts. When storing specific parts, some numbers can

be converted to floating data points.

To parse the GPGGA string, first read the entire string into 1 large string (see

Section 4.1). Next parse the string into a group of smaller strings (see Section

4.2.1). Determine which of the smaller strings to keep and which to convert to

floating point number, then store the data.

Use the SplitStr instruction to parse the GPGGA string into an array of strings.

Declare an array of 18 strings of 15 characters.

Example: ParseStr(18) as string * 15

The SplitStr instruction uses the result string, search string, filter string,

number of splits and split option to parse the search string and store the results

in the result string. The GPGGA string uses the comma character (chr(44))

between each parameter. The comma makes a nice marker to parse on.

Example: SplitStr (ParseStr(1),GPSData ,chr(44),18,5)

Strings can be converted to floats with the simple assignment operator, but

Latitude and Longitude require more precision than the CR1000, CR3000,

CR800, or CR850 will store as a floating point number.