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EN
LoRaWAN COMFORT CO2 - Guide utilisateur / User guide version V1.1.1
63
Page
of 69
FR
2.7.4 Transmission on overpassed threshold and alarm repetition
If the feature is activated, the device can repeat a threshold alarm until it measures a data outside the alarm range. The frequency of the repeti-
tion is configured by the user (registers S321 x S322).
Product in standby
Send frame 0x6B*
No
Measure T+H+CO2
Yes
Sampling
period
reached
?
Threshold over-
passed
?
No
Alarm
repetition
activated
?
No
Repetition of the
0X6B frame every
S321 x S322
Send frame 0x6B*
Turn back to
normal ?
No
Yes
Yes
Yes
*The «alarm status» byte gives the information about if the alarm is active or inactive for
each sensor (temperature, humidity or CO2) and allows to dissociate a 0x6B frame when
the alarm start from a 0x6B frame when it comes back to normal.
The linked parameters are:
• The sampling period (S321),
• The alarm repetition (S322),
• The thresholds for temperature (S330 to S334),
• The thresholds for humidity (S340 to S344),
• The thresholds for CO2 concentration (S350 to S354).
Example:
Register Encoding
value
Value
Result
S301
Decimal
0
Event mode
S321
Decimal
300
A sampling every 10 minutes (300 x 2
seconds = 10 minutes)
S322
Decimal
2
Alarm repeated every 2 sampling if still
active
S330
Decimal
1
Low threshold for temperature activated
S333
Decimal
200
Low threshold at 20°C
S334
Decimal
10
Hysteresis of 1°C
S340
Decimal
2
High threshold for humidity activated
S341
Decimal
65
High threshold at 65%
S342
Decimal
5
Hysteresis of 5%
S350
Decimal
1
CO2 alarm activated
S353
Decimal
1300
Threshold at 1300 ppm
S354
Decimal
30
Hysteresis of 30 ppm
In this example :
• The product measures the temperature, the humidity and the CO2 concentration every
10 minutes.
• The product send an alarm f the temperature is lower than 20°C or if the relative hu-
midity overpass the 65% or if the CO2 concentration is higher than 1300 ppm.
• If the alarm is still active (a threshold is overpassed), the device repeat the alarm every
2 sampling (every 20 minutes).
• The device will send an return to normal alarm if the temperature is higher than 21°C,
or if the humidity is lower than 60% or if the CO2 concentration is lower than 1270 ppm.