my first posting here, please be gentle

I have domoticz 4.9700 running on a RPi3, with -among others- a RFLink USB-gateway (v48.4).
With that, I succesfully can switch a "klik-aan-klik-uit" (kikA) switch.
However, a second KIKA device shows strange behaviour:
It is an ACD-200 dimmer. In earlier days. I controlled it with a KIKA remote (AYCT-102). It works very un-userfriendly: By pressing 'on', it switches on (duh). By pressing on again, it cycles through all dimm-states (slowly dimming until minumum, then back up to max, etc). By pressing 'on' a third time, it fixes on the current dim state. (And pressing off, well, you guess it).
When pressing 'learn light/switch' in domoticz, it succesfully detects the signal from my remote (I have to manually select the type, as it defaults to 'blinds'.) After that, I can only switch the lights on once . After that, the switch does nothing anymore. In the log, I can see the signal is sent to the dimmer though.
Code: Select all
2018-09-26 17:50:51.693 Status: User: Admin initiated a switch command (18/Serre/On)
2018-09-26 17:50:51.695 Status: RFLink Sending: 10;NewKaku;109cde6;2;ON
2018-09-26 17:50:52.618 (RFLink-433) Light/Switch (Serre)
Does anyone recognises this? I think it's a fairly common dimmer in NL, so hopefully...
What's best to choose: nice to have it on Domoticz as a dimmer, but as a on/off is also OK. (Both have I tried, and behave as above).
Please advice. If more info is needed, I'll provide.
TIA,
Rolf