Status registers (read-only), Configuration registers – Vaisala HMW90 User Manual
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106 __________________________________________________________________ M211399EN-F
Status Registers (Read-Only)
Table 43
HMW90 Modbus Status Registers
Name
Address
Description
Error code (bits 15…0)
0513,6913 0 = no errors
Configuration Registers
Configuration parameter registers are used to configure the measurement.
Writing out-of-range values is silently ignored.
NOTE
Elevation is linked to pressure according to the following equation:
p = 101325 (1 - 2.25577 10
-5
h)
5.25588
where p is pressure in Pa and h is altitude above sea level in m. This
means that changing altitude will also change pressure and vice versa.
Table 44
HMW90 Modbus Configuration Parameter Registers
Name
Metric float Metric
integer
Metric unit &
valid range
Non-metric
float
Non-metric
integer
Non-metric unit
& valid range
Pressure 0777…0779 1029 (×1) 700…1100 hPa 7177…7179 7429 (×1)
700 … 1100 hPa
Elevation 0779…0780 1030 (×1) -700...2300 m 7179…7180 7430 (×1)
-2300 … 10000 ft