Unclear about rain measurement

[phloks]

Just a quick question.
I have a WH3080, which only sends rain totals. Looking at the data coming from the rainmeter, I see values like 451.2.
In other words, I do not have a current rain rate coming from the outside unit...
So I'm sending an svalue of "0;451.2" to Domoticz (as described in de JSON/API docs)
The gauge still displays 0 mm/h rate, and 0 mm.

Does Domoticz nowadays calculate the rainrate, even if I send 0 as rainrate ?
In other words, do I need to wait until the svalue changes before I can see something change in the gauge ?

Thanks,
Hans