Vaisala HMP4 - Configuration Registers

Register
Number
(Decimal)
Address
(Hexadecimal)
Register Description Data Format Metric Unit
23 0016
hex
Water vapor pressure 32-bit float hPa
25 0018
hex
Water vapor saturation
pressure
32-bit float hPa
27 001A
hex
Enthalpy 32-bit float kJ/kg
31 001E
hex
Dew point temperature
dierence
32-bit float °C
33 0020
hex
Absolute humidity at
NTP
32-bit float
g/m
3
65 0040
hex
Water mass fraction 32-bit float ppm
w
Configuration Registers
The configuration registers listed here are the most important for typical users. For more
information on available configuration registers, see HMP Series User Guide (M212022EN)
available at www.vaisala.com.
Table 3 Modbus Configuration Data Registers (Writable)
Register
Number
(Decimal)
Register
Address
(Hexadecim
al)
Register Description Data
Format
Unit / Valid Range
General
1289 0508
hex
Probe heating on/o.
Available on HMP7 model
only.
When on, relative humidity
measurement is disabled
unless temperature is
written to register 0334
hex
from an external source.
16-bit
boolean
0 = o (default)
1 = on
Compensation Setpoints
769 0300
hex
Pressure compensation
setpoint
32-bit float Unit: hPA
Default: 1013.25 hPa
21
ENGLISH