Garmin GPS 16-HVS Instruction Manual - Page 23

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1. Wiring

Appendix B. CR9000(X) Program

Example

'NEMAGGA_Sio4_030805MGW1.CR9

'This program acquires NMEA GGA data from a GPS receiver using the SDM-SIO4.

'_____

'Notes:

'(1) Data is acquired from NMEA0183 $GPGGA string:

' Sio4Fields: GGAFields:

' f1

GGA(Field1)

' f2,f3

GGA(Field2)

' f4,

GGA(Field3)

' f5,f6

GGA(Field4)

' f7

GGA(Field5)

' f8

GGA(Field6)

' f9

GGA(Field7)

' f10

GGA(Field8)

' f11

GGA(Field9)

GGA(Field10)

GGA(Field11) Geoidal seperation in Meters

GGA(Field12)

GGA(Field13) Age of differential GPS data

GGA(Field14) Differential reference station

'(2) SIO4 programming:

' fltst 1 "t[$GPGGA,]xFt[,]Dt[.]Dt[,]b1t[,]Dt[.]Dt[,]b1t[,]Ft[,]Ft[,]Ft[,]FX"

Const OneRep=1

Const NoValues=0

Const OneValue=1

Const ElevenGGAValues=11

'..

Const UnityMultiplier=1.0

Const NoOffset=0.0

'..

Const Sio4Address0=0

Const Port2=2

'..

'SDM-Sio4 command codes:

Const UnusedParameter = 0000

Const PollForData0001 = 0001

Const SendDataToLgr = 0004

Const Sio4COMSetUpCmd = 2049

Const StartRxFilter = 2054

Const Port2ComCode = 9147 '9=NoHandshaking; 1=1StopBitNoParity; 4=8DataBits; 7=19200Baud

Const RxFilt9001

= 9001 'Command parameter for user defined fltst #1.

Dim DataPoll,NotUsed

'..

Public RawGGAData(ElevenGGAValues)

Alias RawGGAData(1)=GGA_UTC_Time

Alias RawGGAData(2)=Latt_Int : Units Latt_Int=Deg

Alias RawGGAData(3)=Latt_Frac : Units Latt_Frac=Deg

Alias RawGGAData(4)=LattH_NS

Alias RawGGAData(5)=Longit_Int : Units Longit_Int=Deg

Definitions:

GGA_UTC_Time of position

Lattitude

North or South indication letter

Longitude

East or West indication letter

GPS quality,0=NoGPS,1=GPS,2DGPS

Number of satellites in use

HDOP, Horizontal Dilution Of Precision

Antenna altitude in Meters

B-1