Sontex 878 - Operating Mode; Cycle; Single Sensor with Start Sensor; Dual Sensor Version

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Instruction for Use | HCA 56x and 8x8
5. Operating mode
5.1 Cycle
The heat cost allocators 565 / 566 / 868 / 878 operate in a cycle of 4 minutes. Most of the time,
the device is in sleeping mode. Every 4 minutes the device is set into operation and operates
according to the adjoining diagram.
The clock-pulse generator is a counter which is completely independent from the rest of the
program. This counter is designed in a way so that it is impossible to stall the cycle or to skip
one or more cycles.
Each cycle follows the adjoining diagram. The measuring and calculating processes are ex-
plained in detail later.
The tasks carried out during one cycle are taking approx. 100 ms. This means that the device is
in sleeping mode more than 99.8 % of the time. It can be set into operation between two cycles
over the optical probe or by pushing the button. In this case it carries out the requested task
and then returns to sleeping mode.
In case an optical probe is connected or the button is pushed during the course of the cycle,
the respective value is readout at the end of the cycle.
The button can be pushed for an indefinite period of time and the optical probe can be left
in its position since the normal function of the device is not impaired by an influence from
outside.
5.2 Single Sensor with Start Sensor
The start sensor of the single sensor version serves as an ambient temperature sensor which
mainly functions during the heating up period.
The start temperature is the threshold temperature of the radiator at which the device always
starts to carry out energy ratings. For these ratings, the measured radiator temperature and an
assumed ambient temperature of 20° C are used as calculation basis.
5.3 Dual Sensor Version
For the dual sensor version basically the same specifications apply as for the single sensor
version with start sensor. However, for calculating the room temperature the real temperature,
measured by the ambient temperature sensor.

Position 56 : LoRa Transmission interval (SF12):
Default value 240 minutes / configurable from 240-540 minutes

Position 57 : LoRa Rejoin interval :
Default value 30 days / configurable from 5 -255 days

Position 58 : Automatic Sync RTC:
2 possibilities : yes (by default) / no

Position 59 : LoRa Confirmation mode :
4 possibilities: 1x day (by default) / activated / desactivited / 2x days

Position 60 : LoRa Start Join
2 possibilities: SF7...SF12 (by default) / SF12 only

Position 61 : Short telegram (max 50 byts)

Position 62 : Long telegram (max 114 byts)
For Sontex 565 / 566 heat cost allocators, positions 41 to 43 and 50 to 62 are not applicable.
The transmission intervals for LoRa are calculated in such a way that they have no
influence on the battery life of the device.
The use of downlink can reduce the battery life, depending on the number of
downlink per year (> 2 downlinks).
Start of cylce
Measuring and
calculation of the
temperature
Calculation of the
new consumption
value
Update time and
date
End of cycle
Update display