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sigfox ANALOG - Guide utilisateur / User guide version V2.0.0
4.
DESCRIPTION OF THE FRAMES
4.1. Uplink frames
All of the uplink frames of the product to the network (uplink) always have a size of 11 bytes.
4.1.1
Fixed bytes
FR
The first two bytes of the frame are systematically dedicated to indicate the frame code and the status as pres-
ented below:
0
1
Code
Statut
EN
4.1.1.01
Byte code
This byte contains the code associated with the frame to facilitate its decoding by the data system.
4.1.1.02
Status Byte
The status byte is broken down in the following way:
Alarm Status
No Error
Configuration
done
Low bat
HW Error
Details of the fields:
• Frame counter: Frame counter, it increments at each transmission and allows the user to see quickly if a frame
has been lost. It counts from 0 to 7 before looping back.
• HW: This bit is set to 1 when a hardware error has occurred, for example a writing problem in the EEPROM, a
reading problem on the ADC, etc. The product must be returned to the service dept.
• Low Bat: bit at 1 if the battery voltage is less than 2.5V, otherwise 0. This information remains permanent.
• Confg: bit at 1 if a confguration was carried out during the last downlink frame, otherwise 0. This bit
returns to 0 as from the next frame.
E.g.:
A value of the status byte equal to 0xA2 (= 10100010 in binary) gives:
• Bit 7 at 5 = 101 = 0x05 i.e. a frame counter at 5
• Bit 4 at 0 = 00010 in binary i.e. a low battery alarm
4.1.2
Product configuration information frames
During the passage into operation mode (from the Park or Command Mode), the following frames (0x10 to 0x14)
representing the application configuration of the product are transmitted:
0
1
Code
Status
0x10
Cf Sta-
tus
0x10
0xA2
Description of the frame:
• Byte 2: register 300, periodicity of the Keep Alive frame, expressed in tens of minutes
• Byte 3: register 301, periodicity of the transmission, expressed in tens of minutes
• Byte 4: register 320, configuration of the channel A sensor
2
3
Bit 7
Bit 6
Bit 5
Frame Counter
0x00 to 0x07
2
3
S300
S301
S320
0x48
0x00
0x02
4
5
6
PAYLOAD
Bit 4
Bit 3
Reserved
Reserved
X
X
X
X
X
X
X
X
4
5
6
PAYLOAD
S321
S322
0x03
0x01
7
8
9
Bit 2
Bit 1
HW
Low Bat
0
0
0
0
0
1
1
0
7
8
9
S323
S306
X
0x02
0x01
10
Bit 0
Config.
0
1
0
0
10
X
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