Add modbus switch page

source/components/switch.modbus.markdown

@@ -0,0 +1,48 @@
+---
+layout: page
+title: "Modbus switch support"
+description: "Instructions how to integrate Modbus switches into Home Assistant."
+date: 2015-08-30 23:38
+sidebar: false
+comments: false
+sharing: true
+footer: true
+---
+
+<img src='/images/supported_brands/modbus.png' class='brand pull-right' />
+The modbus switch platform allows you to control [Modbus](http://www.modbus.org/) switches.
+
+To use your Modbus switches in your installation, add the following to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yml entry
+switch:
+  platform: modbus
+  slave: 1
+  registers:
+    24:
+      bits:
+        0:
+          name: My switch
+        2:
+          name: My other switch
+  coils:
+    0:
+      name: My coil switch
+```
+
+Configuration variables:
+
+- **slave** (*Required*): The number of the slave (ignored and can be omitted if not serial Modbus).
+- **registers** array (*Required*): The array contains a list of relevant registers to read from.
+  - **number of register** (*Required*): Listing relevant bits. It must contain a `bits` section.
+    - **bits** array (*Required*): Listing relevant bits. It must contain a `bits` section.
+      - **name** (*Required*): Name of the switch.
+- **coils** (*Optional*): A list of relevant coils to read from/write to
+  - **number of coil** array (*Required*): 
+    - **name** (*Required*): Name of the coil.
+
+<p class='note warning'>
+Each named bit will create a switch.
+</p>
+