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TEMP V3 LoRaWAN 863-870 - Guide utilisateur / User guide version V3.0.0
2.2.4 Transmission on threshold overpassed with alarm repetition
The product enables the detection of a threshold overpassed (high and low) for each probe and to repeat this alert depending on a determined
period (register S321 x S322).
Stand-by mode
Sampling peri-
od reached?
Temperature
sampling
on probe 1 and/or 2
Threshold
overpassed?
Sending 0x58*
Alarm repeti-
tion activated?
0x58 frame repetition
every S321 x S322
Come back to
normal?
Sending 0x58*
Settings associated to this operating mode are:
• Sampling period (register 321),
• Alarm repetition (register 322),
• Activation of the probes (register 324).
• Alarm configuration on probe 1 (register 330) and probe 2 (register 340).
No
• High threshold on the probe 1 (register 331) and probe 2 (register 341).
• Hysteresis for high threshold on probe 1 (register 332) and probe 2 (register 342).
• Low threshold on the probe 1 (register 333) and probe 2 (register 343).
Yes
• Hysteresis for low threshold on probe 1 (register 334) and probe 2 (register 344).
Example:
Registers
S301
S324
No
S330
S331
S332
Yes
S333
S334
S321
No
S322
In this example:
Yes
• The product measure temperature only on probe 1
• On probe 1, there is a high threshold at 70°C with a come back to normal at 65°C
and a low threshold at10°C with a come back to normal at 12°C
• A sampling (reading) every 10 minutes (300 x 2 seconds = 10 minutes)
• As long as the alarm is active (threshold always overpassed), this alarm will be
repeated every 2 samples (so every 20 minutes).
No
Yes
*The "alarm status" byte gives the information if the alert is activated or not and so allows
to dissociate a 0x58 frame sent to alert that the threshold is overpassed from a 0x58 frame
sent to inform about come back to normal.
Encoding
Value
Result
Decimal
0
Alarm mode
Decimal
1
Only probe 1 is activated
Decimal
3
High and low threshold activated on probe 1
Decimal
700
High threshold is 70°C
Decimal
50
Hysteresis for high threshold is 5°C, the
come back to normal is at 65°C
Decimal
100
Low threshold is 10°C
Decimal
20
Hysteresis for low threshold is 2°C, the come
back to normal is at 12°C
A sampling is done every 10 minutes (300 x
Decimal
300
2 seconds = 10 minutes)
Alarm will be sent every 2 sampling if
Decimal
2
always activated
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EN
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