Just tried that and then created a switch and changed the type to Venetian blinds EU. No luck while the log shows the correct command.

2017-04-19 07:05:27.701 User: Domousr initiated a RFLink Device Create command: 20;08;RTS;ID=02FFFF;SWITCH=03;CMD=DOWN;
2017-04-19 07:05:27.810 (RF-Link) Light ...

Has anyone actually got this to work with Domoticz? And how?
I followed the instructions and paired it. When I have the RFLink connected to my laptop I can send the codes like 10;RTS;02FFFF;3;DOWN; and UP and STOP and ON and OFF and they work and my screen reacts as expected.
10;RTS;02FFFF;3;STOP ...