
User's Guide ______________________________________________________________________
198 _________________________________________________________________ M210566EN-J
NOTE
If your MODBUS master supports 32-bit floating point values, always
use them instead of 16-bit integer registers.
The use of 16-bit integer values is not recommended in critical
applications because you cannot distinguish true zero values from zero
values generated by measurement failures.
In addition to this, 2’s complement makes negative values look like large
positive values, which must be taken into account when utilizing the
16-bit register values.
When writing 16-bit values in configuration registers, they are always
processed as signed integers in the range of -32768…+32767. You shall
use the floating point registers to write values outside this 16-bit signed
integer range. Maximum writable value is 32767 also for configuration
registers that do not accept negative values.
Measurement Data (Read-Only)
Table 38 Measurement Data Registers
Name Float Integer Unit
RH 0001…0002 0257 (×0.01) %
T 0003…0004 0258 (×0.01) °C
T
d
0007…0008 0260 (×0.01) °C
T
d/f
0009…0010 0261 (×0.01) °C
a 0015…0016 0264 (×0.01) g/m³
x 0017…0018 0265 (×0.01) g/kg
T
w
0019…0020 0266 (×0.01) °C
H
2
O 0021…0022 0267 (×1) ppm
V
p
w
0023…0024 0268 (×0.1) hPa
p
ws
0025…0026 0269 (×0.1) hPa
H 0027…0028 0270 (×0.01) kJ/kg
ΔT 0031…0032 0272 (×0.01) °C
H
2
O 0065…0066 0289 (×1) ppm
W
Available measurements depend on the instrument configuration. Values
may be unavailable also in case of device failure; Read status registers or
exception status outputs to check for failures.
NOTE
Only real-time data can be read from the instrument. Data that is
recorded in the transmitter’s memory (internal memory or data logger
module) cannot be read through MODBUS.
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