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FIELD TEST DEVICE - LoRaWAN AS 923 - Mode d'emploi V1.0.0
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4.2.1 Temperature
Hex
Binary
Frame
N°
Byte
N°
Comments
Value
1B
0001
1011
2
2
Temperature in °C (two’s complement)
-128 ... +127
Aid for decoding temperature
Hex
Sign Bit
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Value T°C
Value
64
32
16
8
4
2
1
1B
0
0
0
1
1
0
1
1
+27°C
F4
1
1
1
1
0
1
0
0
-12°C
• For a positive temperature (sign bit = 0 ) : Value T°C = 16 + 8 +2 + 1 = +27°C
• For a negative temperature (sign bit = 1) : Value T°C = (64+32+16+4)-128 = -12°C
4.2.2 UL counter
Hex
Decimal
Frame
N°
Byte
N°
Comments
Value
20
32
2
3
Uplink frame counter
0 ... 255
Please note:
This counter is not the LoRaWAN stack frame counter, but an internal frame counter. Therefore, there is no correlation between
this counter and the one that you can view on the network.
4.2.3 DL counter
Hex
Decimal
Frame
N°
Byte
N°
Comments
Value
20
32
2
4
Downlink frame counter
0 ... 255
Please note:
This counter is not the LoRaWAN stack frame counter, but an internal frame counter. Therefore, there is no correlation between
this counter and the one that you can view on the network.
4.2.4 Battery level
Hex
Decimal
Frame
N°
Byte
N°
Comments
Value
0F
C9
4041
2
5 to 6
Voltage of the battery (in mV)
0...65535
4.2.5 RSSI
Hex
Decimal
Frame
N°
Byte
N°
Comments
Value
52
82
2
7
RSSI Value in dBm (Absolute value)
0 ... 255
In the example the RSSI value is -82dBm
4.2.6 SNR
Hex
Decimal
Frame
N°
Byte
N°
Comments
Value
07
07
2
8
SNR Value in dB (Two’s complement)
-128 ... +127
In the example the SNR value is 7 dB