Gill Instruments Ltd
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MaxiMet
Page 92
Issue 3
Doc. No. 1957-PS-021
May 2018
T
True Wind measurement, Wind Speed and/or Direction information, corrected
by a compass and GPS (option) to give accurate data regardless of where north
marker is aligned
,,
Wind Speed only available if a GPS option is fitted
N
Knots (NMEA output fixed to Knots measurement only)
A
Acceptable measurement (V is a void fail measurement)
OC
Hex Checksum
<CR><LF>
End of message termination
Immediately followed by:
$WIXDR,Y,000.000,M,PRECIP*77<CR><LF>
Where: $WIXDR
Wind Instrument Transducer
Y
Type of Sensor (Precipitation)
000.000
Millimetres per hour of Precipitation
M
Precipitation Units of Measure (Millimetres)
PRECIP
Name of Precipitation Sensor
*77
Hex Checksum
<CR><LF>
End of message termination
Followed by GPS data if option available:
$GPGGA,161229.487,3723.2475,N,12158.3416,W,1,07,1.0,9.0,M, , , ,0000*18<CR><LF>
Where: $GPGGA
NMEA GPS Protocol Header
161229.487
UTC Time, hhmmss.sss
3723.2475
Latitude ddmm.mmmm
N
North/South Indicator
12158.3416
Longitude ddmm.mmmm
W
East/West indicator
1
Position Fix Indicator (See below)
07
Satellites being used (Range 0-12)
1.0
Horizontal Dilution of Precision
9.0
Mean Sea Level (NSL) Altitude in metres
M
MSL Units, metres
, ,
Geoid Separation and Units in metres
0000
Differential GPS Reference Station ID
*18
Checksum
<CR><LF>
End of message termination
Position Fix Indicator:
Value
Description
0
Fix not available or invalid
1
GPS SPS Mode, fix valid
2
Differential GPS, SPS Mode, fix valid
3-5
Not supported
6
Dead Reckoning Mode, fix valid
Checksum, the 2 digit Hex Checksum sum figure is calculated from the Exclusive OR of the bytes
between (and not including) the $ and * characters.
