EN
LoRaWAN COMFORT CO2 - Guide utilisateur / User guide version V1.1.1
62
Page
of 69
FR
2.7.3 Transmission on exceeding CO2 concentration threshold
The device enables to detect if a high threshold is overpassed for the CO2 concentration, as mentioned in the following scheme:
The product send the frame when the threshold is overpassed or when it comes back to normal.
Example:
Register Encoding
value
Value
Result
S301
Decimal
0
Event mode (no periodic
data)
S321
Decimal
300
1 sample every 10 minutes
(300/60sec*2)
S350
Decimal
1
Alarm CO2 activated
S353
Decimal
1300
High threshold value in ppm
S354
Decimal
30
Hysteresis in ppm
In this example:
• The product measures the CO2 concentration every 10 minutes.
• The product activate the alarm if a measure is higher than 1300
ppm.
• The product send the “come back to normal” and deactivate the
alarm if the CO2 concentration is turned back under 1270 ppm
(1300-30).
NOTE:
as mentioned, it is possible to mix the periodical mode and
the alarm mode.
Period of
reading
reached ?
Send frame 0x6B
Product in standby
Yes
Alarm
already
activated?
Value <
(threshold -
hysteresis)
Value >
threshold
Deactivation of the
alarm
Activation of the
alarm
Yes
No
Yes
Yes
No
Measure CO2
No
No
