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FIELD TEST DEVICE - LoRaWAN Europe - Guide utilisateur / User guide version V1.2.3
The screen will display:
•
The number of frames sent (UL COUNT), including repetitions
•
The number of frames received (DL COUNT)
•
The Packet Error Rate (PER) as a percentage
The PER measurement is calculated by comparing the number of frames transmitted to the number of frames received:
•
PER (%) = 100 - (( DL_COUNT / UL_COUNT) * 100)
FR
3.6. Downlink screen
This menu can be accessed by briefly pressing on pushbutton 2 after the PER menu. It will allow you to view a downlink frame sending by the
network. This frame is displayed in ASCII characters. The non printable characters are replace by a point.
EN
The screen allow a viewing of 51 characters (17 characters per lines). If the size of the payload is upper than 51 bytes, the product will not
display the extra bytes.
4. DECODING THE PAYLOAD
The size of the Field Test Device's payload can vary depending on the information transmitted. The first byte will enable you to identify the pres-
ence of information contained in the payload. Information will always be shown in the order indicated in the following table.
Example of a payload received: BF1B45159690005534502720200FC95207
This example will be used in order to explain how the payload is decoded.
Order
1
Number of bytes
1
Description
Status Temperature
Example
BF
4.1. Status
Hex
Decimal
1
0
1
1
BF
1
1
1
1
0: Data missing from the payload
1: Data present in the payload
Barre de statuts
Zone d'affichage
de la trame
2
3
1
4
GPS Latitude
1B
45 15 96 90 00 55 34 50
N°
Bit N°
7
Presence of temperature information
6
Transmission triggered by the accelerometer
5
Transmission triggered by pressing pushbutton 1
4
Presence of GPS information
1
3
Presence of Uplink frame counter
2
Presence of Downlink frame counter
1
Presence of battery level information
1
Presence of RSSI and SNR information
Figure 12 : Ecran Downlink
4
5
4
1
GPS
GPS Longitude
Quality
Counter
27
Comment
6
7
8
9
1
1
2
1
DL
UL
Battery
Count-
RSSI SNR
level
er
20
20
0F C9
52
Value
0 or 1
0 or 1
0 or 1
0 or 1
0 or 1
0 or 1
0 or 1
0 or 1
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