Campbell CR23X Spécifications Page 253

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APPENDIX B. CONTROL PORT SERIAL I/O INSTRUCTION 15
B-9
VTG Direction and Speed - 37 characters
including CRLF
$GPVTG,010,T,356,M,5.39,N,10.0,K*4FCRLF
Field Data Description
1. $GPVTG message identification
2. 010 Track made good in
degrees True
3. T True
4. 356 Track made good in
degrees Magnetic
5. M Magnetic
6. 5.39 Speed over ground in
Knots
7. N Knots
8. 10.0 Speed over ground in
Kilometers per Hour
9. K Kilometers per Hour
10. *4F Checksum
11. CRLF Carriage Return Line
Feed
The following program example will read-in the
GGA and VTG GPS strings. Since this program
is unique to the GPS application, additional data
processing will be required to decode and
format these strings. See Program Example #3
for a complete listing.
*Table 1 Program
01: 1 Execution Interval (seconds)
; READ IN SERIAL GPS DATA VIA NULL MODEM AND
; CR23X 9-PIN RS-232 PORT
1: Port Serial I/O (P15)
1: 1 Reps
2: 03 Configuration Code ;RS-232 ASCII, 4800 BAUD
3: 1 Delay (0.01 seconds)
4: 9 RS-232 Port ;GET GPS DATA VIA CSI 9-PIN RS-232
PORT
5: 0 Output Loc [ _________ ]
6: 0 No. of Locs to Send
7: 42 Termination Character ;ASTERISK *
8: 100 Maximum Characters ;GGA + VTG CHARACTERS
9: 100 CTS/Input Wait
10: 27 Loc [ RAW_TIME ] ;Input Location for first byte of received data
11: 1.0 Mult
12: 0.0 Offset
; CONFIGURE AND LOAD INPUT FILTER STRINGS
2: Extended Parameters (P63)
1: 36 Option ;$
2: 71 Option ;G
3: 80 Option ;P
4: 71 Option ;G
5: 71 Option ;G
6: 65 Option ;A
7: 0 Option ;END OF STRING 1
8: 36 Option ;$
3: Extended Parameters (P63)
1: 71 Option ;G
2: 80 Option ;P
3: 86 Option ;V
4: 84 Option ;T
5: 71 Option ;G
6: 00 Option ;END OF STRING 2
7: 00 Option
8: 00 Option
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