Campbell-scientific CR10X Measurement and Control System Manuel d'utilisateur Page 240

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APPENDIX B. CONTROL PORT SERIAL I/O INSTRUCTION 15
B-8
The following program example will read-in the GGA and VTG GPS strings. Since this program is
unique to the GPS application, additional data processing will be required to decode and format these
strings. See Program Example #3 for a complete listing.
The following is a section of a datalogger program that uses Instruction 15 to read in data from a GPS
receiver. This program uses a filter for reading in the GGA and VTG strings. The GGA strings include
time, position and fix related data for the GPS receiver; the VTG strings convey the actual track made
good and the speed relative to the ground. Additional data processing is required to completely decode
and format these strings.
06: Port Serial I/O (P15)
01: 1 Reps
02: 1 Configuration Code; RS-232 ASCII, 1200 baud
03: 1 Delay (0.01 seconds)
04: 7 C7 RTS/DTR ; C8 RXD (code could be 78)
05: 0 Output Loc [ ________ ]
06: 0 no. of Locs to Send
07: 42 Termination Character; asterisk (*)
08: 100 Maximum Characters; GGA + VTG characters
09: 100 CTS/Input Wait
10: 27 Loc [ RAW_TIME] ; Input Location of first received byte
11: 1.0 Mult
12: 0.0 Offset
; Configure and load input filter strings
07: Variable Parameter (P63) or (P68)
01: 36 Option; $
02: 71 Option; G
03: 80 Option; P
04: 71 Option; G
05 71 Option; G
06: 65 Option; A
07: 0 Option; END OF STRING 1
08: 36 Option; $
08: Variable Parameter (P63) or (P68)
01: 71 Option; G
02: 80 Option; P
03: 86 Option; V
04: 84 Option; T
05 71 Option; G
06: 0 Option; end of string 2
07: 0 Option;
08: 0 Option;
B.6 PROGRAM EXAMPLES
The following examples represent portions of a
larger, more complete application program, and
SHOULD NOT BE USED VERBATIM.
B.6.1 EXAMPLE 1: ATMOSPHERIC
INSTRUMENTS RESEARCH AIR-DB-1A
BAROMETER
Various barometer functions (mode, units of
output, baud rate, etc.) are determined by
jumpers internal to the barometer. A summary
of the jumper configurations is found in Section
B6. Detailed instructions for jumper placement
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