i did the same thing as rlebel with my somfy interface module but used a Global cache IP2SL, this has a db9 port so the rj45 to db9 that comes with the somfy interface just connected right to the IP2SL. I used the same settings as rlebel, but mine did not work at first. So after playing around for about 1 hour, I changed all the settings communication settings (baud, parity etc) in the IP2SL to something different and saved it, then changed it all back to the correct settings and it worked, from the box the IP2SL all settings were correct except baud was not 9600, i did not have to change anything else, so i am not sure why it did not work right away, but after changing all settings to something different and then back to correct again, it is working. Just posting incase someone else has this issue, I also changed my IP to static in the IP2SL instead of leaving dhcp, also sure to use port 4999 in isy