Updated KNX documenation (#672)

* Updated KNX documentation

* Fixed minor formating issue

source/_components/switch.knx.markdown

@@ -1,19 +1,29 @@
 ---
 layout: page
-title: "KNX Switch"
-description: "Instructions how to setup the KNX switches within Home Assistant."
-date: 2016-07-13 07:00
+title: "KNX Switches"
+description: "Instructions on how to integrate KXN switches with Home Assistant."
+date: 2016-06-24 12:00
 sidebar: true
 comments: false
 sharing: true
 footer: true
-<<<<<<< HEAD
-logo: zknx.png
-=======
 logo: knx.png
->>>>>>> master
-ha_category: Switch
+ha_category: DIY
 ha_release: 0.24
 ---
 
-To get your KNX switches working with Home Assistant, follow the instructions for the [KNX component](/components/knx/).
+
+The KNX switch component is used as in interface to switching actuators.
+
+```yaml
+switch:
+  platform: knx
+  name: KNX Switch
+  address: 0/0/1
+  state_address: 0/0/3
+```
+
+- **name** (*Optional*): A name for this devices used within Home assistant
+- **address** (*Required*): The KNX group address that is used to turn on/off this actuator channel
+- **state_address** (*Optional*): Some KNX devices can change their state internally without any messages on the KXN bus, e.g. if you configure a timer on a channel. The optional state_address can be used to inform Home assistant about these state changes. If a KNX message is seen on the bus addressed to the given state address, this wil overwrite the state of the switch object.
+For switching actuators that are only controlled by a single group address and can't change their state internally, you don't have to configrue the state address