Gill Instruments Ltd
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MaxiMet
Page 88
Issue 3
Doc. No. 1957-PS-021
May 2018
6.6.
Configuring MaxiMet for NMEA 0183 Output
1.
Connect a default set MaxiMet to a PC as described in para 4.6.
2.
Open MetSet as described on para 6.2 and click on the Reporting page.
3.
Change the Report Format drop down menu from USERDEF to NMEA.
4.
On the Comms page select the required Interface, generally RS422.
5.
On the Comms page select the required Baud Rate, normally 4800 baud (or sometimes 9600
baud).
6.
Click on Save Settings to Device.
Note: Wind Speed units are fixed at Knots (N) irrespective of how wind reading units have been set up
on the MetSet Wind page. The same applies for GPS settings - readings are always in knots in
NMEA mode.
6.6.1 GMX100 NMEA Output String
"$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> is a Carriage return character (ASCII hex value d)
<LF> is a Line Feed Character (ASCII hex value a)
Checksum, the 2 digit Hex Checksum sum figure is calculated from the Exclusive OR of the bytes
between (and not including) the $ and * characters.
Immediately followed by:
$PGILT,A,+XX,D,+YY,D,+Z,TILT*HH<CR><LF>
Where: $P
Start of sentence and proprietary sentence identifier
GIL
Gill Instruments recognised NMEA manufacturer mnemonic
T
Indicates TILT information
A
Type of Sensor (Angular Displacement)
+XX
+X Tilt indicates unit is tipping towards east "XX" degrees
Or
-XX
-X Tilt indicates unit is tipping towards west "XX" degrees
D
Units (Degrees)
+YY
+Y Tilt indicates unit is tipping towards north "YY" degrees
Or
-YY
-Y Tilt indicates unit is tipping towards south "YY" degrees
D
Units (Degrees)
+Z
Z-Orientation "+1" shall be reported if the unit is installed upright, or "-1" if
facing downwards
TILT
Name of the Sensor
*HH
Checksum
<CR><LF>
End of message termination
Example GMX100 data string.
$WIXDR,Y,000.000,M,PRECIP*77
$PGILT,A,+00,D,+00,D,+1,TILT*34
Repeated every second (1Hz output).
