Vaillant

boiler: VUW SOE 202/2-5 R3
thermostat: VRT 390

• http://knx-user-forum.de/knx-eib-forum/6872-vaillant-gas-brennwertkessel-mit-ebus-eib-anbinden-2.html
• http://knx-user-forum.de/wiregate/20249-ebus-usb-plugin-knx-87.html
• http://knx-user-forum.de/wiregate/20249-ebus-usb-plugin-knx-96.html
• https://github.com/mknx/smarthome
• https://github.com/john30/ebusd and https://github.com/john30/ebusd-configuration
• https://github.com/JuMi2006/ebusd

See also Vaillant serial port on boiler information

7-8-9 interface

• http://www.mikrocontroller.net/topic/126250
• http://www.seidat.de/hp/heizung/
• https://en.wikipedia.org/wiki/OpenTherm

I think that PWM doesn't apply for my VRT 390 thermometar

It also seems that it's not ebus protocol