7.1.3 UDC Device/Pulse Counting

A pulse converter device = UDC device receives pulses from a meter. Various meters can be connected here. This pulse converter has one input. It receives information which it counts as a pulse and sends to the Datahub. These are not real values but only pulses.
The pulse sizes can differ depending on the counter. A water meter, for example, could use a pulse for one, 10 or 100 gallons.
The UDC device does not know how many pulses the meter has already measured. When the UDC is set up, it starts at 0 and when it is taken down, it also resets to 0. This is noted in the Datahub when it is dismantled if a higher IMR (initial meter read) was known than the next one to be sent. It then continues the measurement at the last known value.
As soon as device is activated, pulses are counted (no matter whether LoRa join was successful or not)
Device is not aware of any physical unit, it does not know if one pulse represents one liter or one gallon, for example, so this is not configurable
When battery is removed and replaced by a new one or device is reset, both following options are ok:
- pulse count is reset to zero
- pulse count is kept, device continues from there once power is back – in this case it must be sure, that pulse count is not an arbitrary value but unchanged