E+E Elektronik EE212, User Manual, Page: 17 / 24

User Manual EE212
Modular Humidity and Temperature Sensor | 17
5.3 Modbus Register Map
The measured data is saved as a 32 bit floating point values (data type FLOAT32) and as 16 bit signed integer
values (data type INT16).
FLOAT 32
Parameter
Unit
1)
Register number
2)
[DEC] Protocol address
3)
[HEX]
Read register: function code 0x03 / 0x04
Temperature
°C, °F 26 0x19
Relative humidity % 28 0x1B
Water vapour partial pressure mbar, psi 30 0x1D
Dew point temperature °C, °F 32 0x1F
Wet bulb temperature °C, °F 34 0x21
Absolute humidity g/m
3
, gr/ft
3
36 0x23
Mixing ratio g/kg, gr/lb 38 0x25
Specific enthalpy kJ/kg,BTU/lb 40 0x27
Frost point temperature °C, °F 42 0x29
INT16
Parameter
Unit
1)
Scale
4)
Register number
2)
[DEC] Protocol address
3)
[HEX]
Read register: function code 0x03 / 0x04
Temperature
°C, °F 100 301 0x12C
Relative humidity % 100 302 0x12D
Water vapour partial pressure mbar, psi 100 303 0x12E
Dew point temperature °C, °F 100 304 0x12F
Wet bulb temperature °C, °F 100 305 0x130
Absolute humidity g/m
3
, gr/ft
3
100 306 0x131
Mixing ratio g/kg, gr/lb 100 307 0x132
Specific enthalpy kJ/kg,BTU/lb 100 308 0x133
Frost point temperature °C, °F 100 309 0x134
1) The choice of measurement units (metric or non-metric) must be done according to the ordering guide, see EE212 datasheet.
Switching from metric to non-metric or vice versa by using the EE-PCS is not possible.
2) Register number starts from 1
3) Register address starts from 0
4) Examples: For scale 100, the reading of 2550 means a value of 25.5. For scale 50, the reading of 2550 means a value of 51.
Tab. 5 EE212 FLOAT32 and INT16 measured data registers