9.3.2.1 Temperature conversion
The temperature measurement is transmitted using an unsigned 12-bit value. The scaling is
1/10 °C and the offset is 80 °C, which means the received value should be subtracted by 800
and then divided with 10 to get it in °C.
9.3.2.2 Relative humidity conversion
The relative humidity (RH) measurement is transmitted using an unsigned 12-bit value. The
scaling is 1/10 % RH and the offset is 25 % RH, which means the received value should be
subtracted by 250 and then divided with 10 to get it in % RH.
9.3.2.3 Carbon dioxide (CO2) conversion
The carbon dioxide (CO
2
) measurement in parts-per-million (ppm – 1 x 10
-6
). The CO2 data
is averaged over a measurement period. The data is transmitted using an un-signed 16-bit
integer. The value 0xFFFF indicates an error in the CO2 reading, and should be displayed as
an alarm or error code in the application, not as a measurement value.
9.3.3 Example: Single measurement report
Data sent on LoRaWAN port 2 : 3e 44 1d 02 1b
(3e1)
HEX
: (993)
DEC
=> 993/10 -80°C => 19.3 gradC
(44d)
HEX
: (1101)
DEC
=> 1101/10 – 25% => 85.1 % RH
(021b)
HEX
: (539)
DEC
=> 539 ppm CO
2
To Next Page
Loading...