Gill Instruments Ltd
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MaxiMet
Page 79
Issue 3
Doc. No. 1957-PS-021
May 2018
TWILIGHT (NAUTICAL)
6 Bit Character String
3
TWILIGHT (ASTRONOMICAL)
6 Bit Character String
3
X TILT
32 Bit Floating Point Value
2
Y TILT
32 Bit Floating Point Value
2
Z ORIENTATION
32 Bit Floating Point Value
2
COMPASS HEADING
32 Bit Floating Point Value
2
GPS HEADING
32 Bit Floating Point Value
2
GPS SPEED OVER GROUND
32 Bit Floating Point Value
2
GPS LOCATION (Longitude)
32 Bit Floating Point Value
2
GPS LOCATION (Latitude)
32 Bit Floating Point Value
2
GPS LOCATION (Height)
32 Bit Floating Point Value
2
GPS STATUS (Fix/no. of satellites)
4 Bit Character String
2
TIME (Date)
16 Byte Character String
8
TIME (Time)
16 Byte Character String
8
SUPPLY VOLTAGE
32 Bit Floating Point Value
2
STATUS
32 Bit Unsigned Integer (UINT) 2
WINDSTAT
32 Bit Unsigned Integer (UINT) 2
USERINFO
16 Bit Character String
8
All registers are 16-bit. The first byte is high order and the second is low.
Each measurement is comprised of two 16bit registers.
o
For each register, the order of the two data bytes comprising the 16-bit register's value
shall be: High Byte/Low Byte.
o
For each 32-bit data type (whether floating point or integer), the order of the first pair of
bytes and last pair of bytes shall be: High Word/Low Word.
Registers start at address 40001.
Holding registers are available in the order of the MaxiMet data string (which can be established
by the REPORT command in non-Modbus Gill ASCII Mode).
If measurements cannot be computed (i.e. a blank field in Gill mode output string/conditions for
reporting Wind Chill/ Heat Index are not being met), their Holding Register contents shall be set to
the Maximum Positive value (0x7FFFFFFF for 32-bit format data (both floating point and integer),
and as 0x7FFF for 16-bit format data).
NOTE:
For alternative Modbus 32-bit integer or 16-bit integer systems, contact Gill Instruments.
GMX100 Modbus Default Setting Register Table
.
Register Type
Register Numbers
Value Type
4ch string
40001-02
Node
32bit float
40003-04
Precipitation Total
32bit float
40005-06
Precipitation Intensity
16ch string
40007-14
Date
16ch string
40015-22
Time
32bit float
40023-24
Supply Voltage
32bit UINT
40025-26
Status
