HM-ES-TX-WM_CCU - Only count every xth pulse?

[etofi]

I have made an HM-ES-TX-WM for my water meter and attached a Panasonic EX-26A-PN to it. Counting the Panasonic pulses works quite well so far.

However, I have the problem that I can't get the Panasonic to recognise and count the red 1 litre pointer correctly. It recognises the black star wheel much better - but this also runs much faster.

But now I can only set 0.001 m3/imp. as the smallest unit in the CCU - which would correspond to the 1 litre pointer.

Is there perhaps a way of adapting the sketch so that it only counts every xth pulse?