Gill GMX100 User Manual page 78

Gill Instruments Ltd
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Taking Measurements in Modbus Mode
1. To work out Modbus register numbers applicable to a MaxiMet parameter, start out with setting
up the MaxiMet in ASCII mode and determining which parameters are to be output, and the exact
order that they are to be output before setting to Modbus Comms.
2. Refer to the Modbus output parameter table below to determine how many registers each chosen
parameter will take up.
3. Fill up the register table, starting at 40001, with the required output parameters in the order in
which they will be output.
Note: After powering up the MaxiMet, wait 10 seconds before requesting any measurements.
Summary of Modbus output parameters
Output Parameter
NODE
SPEED
CORRECTED SPEED
GUST SPEED
CORRECTED GUST SPEED
AVERAGE SPEED
AVERAGE CORRECTED SPEED
DIRECTION
CORRECTED DIRECTION
GUST DIRECTION
CORRECTED GUST DIRECTION
AVERAGE DIRECTION
AVERAGE CORRECTED DIRECTION 32 Bit Floating Point Value
PRESSURE
PRESSURE AT SEA LEVEL
PRESSURE AT STATION
RELATIVE HUMIDITY
ABSOLUTE HUMIDITY
TEMPERATURE
DEWPOINT
PRECIPITATION TOTAL
PRECIPITATION INTENSITY
PRECIPITATION STATUS
WIND CHILL
HEAT INDEX
AIR DENSITY
WET BULB TEMPERATURE
SOLAR RADIATION
SOLAR HOURS
SUNRISE
SOLAR NOON
SUNSET
POSITION OF THE SUN
TWILIGHT (CIVIL)
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MaxiMet
Doc. No. 1957-PS-021
Type
4 Bit Character String
32 Bit Floating Point Value
32 Bit Floating Point Value
32 Bit Floating Point Value
32 Bit Floating Point Value
32 Bit Floating Point Value
32 Bit Floating Point Value
32 Bit Floating Point Value
32 Bit Floating Point Value
32 Bit Floating Point Value
32 Bit Floating Point Value
32 Bit Floating Point Value
32 Bit Floating Point Value
32 Bit Floating Point Value
32 Bit Floating Point Value
32 Bit Floating Point Value
32 Bit Floating Point Value
32 Bit Floating Point Value
32 Bit Floating Point Value
32 Bit Floating Point Value
32 Bit Floating Point Value
4 Bit Character String
32 Bit Floating Point Value
32 Bit Floating Point Value
32 Bit Floating Point Value
32 Bit Floating Point Value
32 Bit Floating Point Value
32 Bit Floating Point Value
32 Bit Floating Point Value
32 Bit Floating Point Value
32 Bit Floating Point Value
8 Bit Character String
6 Bit Character String
Page 78
No. of Registers
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
4
3
Issue 3
May 2018