Vaisala HMP3 - Modbus Registers

Accessing unavailable (temporarily missing) measurement data does not generate an
exception. “Unavailable” value (a quiet NaN for floating point data or 8000
hex
for integer data)
is returned instead. An exception is generated only for any access outside the applicable
register ranges.
A.4.1 Measurement Data Registers
Table 55 Floating point measurement data registers (read-only)
Register
number
(decimal)
Address
(hexadecimal)
Register description Data format Unit
1 0000
hex
Relative humidity 32-bit float %RH
0001
hex
3 0002
hex
Temperature 32-bit float °C
0003
hex
7 0006
hex
Dew point temperature 32-bit float °C
0007
hex
9 0008
hex
Dew/frost point
temperature
32-bit float °C
0009
hex
11 000A
hex
Dew/frost point
temperature at 1 atm
32-bit float °C
000B
hex
13 000C
hex
Dew point temperature
at 1 atm
32-bit float °C
000D
hex
15 000E
hex
Absolute humidity 32-bit float
g/m
3
000F
hex
17 0010
hex
Mixing ratio 32-bit float g/kg
0011
hex
19 0012
hex
Wet-bulb temperature 32-bit float °C
0013
hex
21 0014
hex
Water concentration 32-bit float ppm
v
0015
hex
23 0016
hex
Water vapor pressure 32-bit float hPa
0017
hex
Appendix A – Modbus reference
79
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