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FIELD TEST DEVICE - LoRaWAN US 902-928 - Mode d'emploi V1.0.0
17
Page
of 27
4.1.3 Longitude
Hex Frame N°
Byte N°
Bit N°
Comments
Value
00
1
6
7..4
BCD coding of the entire degree section (one hundredth of a degree)
0
05°53,450
3..0
BCD coding of the entire degree section (one tenth of a degree)
0
0
5°53,450
55
7
7..4
BCD coding of the entire degree section (whole degrees)
00
5
°53,450
3..0
BCD coding of the entire minute section (one tenth of a minute)
005°
5
3,450
34
8
7..4
BCD coding of the entire minute section (whole minutes)
005°5
3
,450
3..0
BCD coding of the decimal section (tenth)
005°53,
4
50
50
9
7..4
BCD coding of the decimal section (one hundredth)
005°53,4
5
0
3...1
Not used
0
Hemispheric coding
0 : East
1 : West
Note
: the value expressed in the payload will be in degrees, minutes and fractions of a second. A conversion to degrees, minutes and seconds
must be carried out in order to make a comparison with the coordinates displayed on the device’s LCD screen.
4.1.4 GPS quality (Not available in Legacy mode)
Hex
Value
Frame
N°
Byte
N°
Bit N°
Comments
Value
27
2
1
10
7..4
Reception scale
1: Good
2: Average
3: Poor
7
3..0
Number of satellites
1 ... 16
The byte’s MSB allows you to find out the quality of the GPS signal
The byte’s LSB allows you to find out the number of satellites viewed by the device
4.2. Frame 2 description
Information will always be shown in the order indicated in the following table.
Byte N°
1
2
3
4
5 to 6
7
8
Description
Status
Temperature
UL counter
DL counter
Battery
level
RSSI
SNR
Example
8F
1B
20
20
0F C9
52
07
Example of a payload received: 8F1B20200FC95207
This example will be used in order to explain how the payload is decoded.
For frame 2, using the previous example, the value of status byte is 0x8F i.e.1000 1111 in binary so in the table:
Hex
Binary
Comments
8F
1
Presence of temperature information
0
Not used
0
Not used
0
Not used
1
Presence of Uplink frame counter
1
Presence of Downlink frame counter
1
Presence of battery level information
1
Presence of RSSI and SNR information
0: Data missing from the payload
1: Data present in the payload
