Campbell Garmin 16-HVS Especificações descarregar pdf (Página 11)

GPS16X-HVS GPS Receiver

5. CRBasic Programming

This section describes programming a CR800, CR850, CR1000, or CR3000.

See Appendix B and C for programming other dataloggers.

CRBasic is used to write programs for the CR1000, CR3000, CR800, and

CR850 dataloggers. These dataloggers use several instructions to read GPS

output, which is asynchronous serial data. As shipped from Campbell

Scientific, the GPS receiver will output data once a second, 38400 baud, 8 data

bits, no parity, and 1 stop bit. Only the GPGGA string is output. See Section

3 for details on the GPGGA string. See Appendix A for specifics on changing

the GPS receiver configuration, including using different baud rates.

5.1 GPS Instruction

The GPS instruction is available for our CR800, CR850, CR1000, and CR3000

dataloggers. It is used along with a GPS device to set the datalogger's clock.

This instruction will also provide information such as location

(latitude/longitude) and speed, and store NMEA sentences from the GPS

device.

To use the GPS instruction, the datalogger operating system

(OS) should be OS17 or higher for the CR1000; OS10 or higher

for the CR3000; or OS08 or higher for the CR800 and CR850.

Go to www.campbellsci.com/downloads

to upgrade the

datalogger OS.

NOTE

The resolution of accuracy for the clock set is 10 microseconds if the

datalogger has a hardware revision number greater than 007 (RevBoard field in

the datalogger's Status table). Otherwise, resolution is 10 milliseconds. The

clock set relies on information from the GPRMC sentence. If this sentence is

not returned, a clock set will not occur.

The GPS instruction has the following syntax:

GPS ( GPSArray, ComPort, TimeOffset, MaxTimeDiff, NMEAStrings )

Description of the parameters follows:

GPSArray The GPSArray parameter is the variable in which to store the

information returned by the GPS. Fifteen values are returned.

If this array is not dimensioned to 15, values will be stored to

fill the array and no error will be returned. If no values are

available, NAN will be returned. The following values are

returned by the GPS:

Array(1) = Latitude, degrees

Array(2) = Latitude, minutes

Array(3) = Longitude, degrees

Array(4) = Longitude, minutes

Array(5) = Speed over ground, knots

Array(6) = Course over ground, degrees

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 35 36

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