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sigfox TEMP- Guide utilisateur / User guide version V2.0.1
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4. DESCRIPTION OF THE FRAMES
4.1. Uplink frame
All of the uplink frames of the product to the network (uplink) always have a size of 11 bytes.
4.1.1 Fixed bytes
The first two bytes of the frame are systematically dedicated to indicate the frame code and the status as presented below:
0
1
2
3
4
5
6
7
8
9
10
Code
Statut
PAYLOAD
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
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Frame Counter
Alarm
activated on
probe 2
Alarm
activated on
probe 1
HW
Low Bat
Config
No Error
0x00 to 0x07
X
X
0
0
0
Configuration
done
X
X
X
X
1
Low bat
0
0
0
1
0
HW Error
X
X
1
X
X
Alarm activated
on probe 1
X
1
X
X
X
Alarm activated
on probe 2
1
X
X
X
X
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.
• Config: bit at 1 if a configuration was carried out during the last downlink frame, otherwise 0. This bit returns to 0 as from the next frame.
• Alarm activated (probe 1 or probe 2): the bit is 1 when a threshold (high or low) is detected on the concerned probe, this bit stay at 1 for
all the frame sent while the threshold is detected and turns at 0 when the threshold is not detected anymore.
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
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