modbus refactoring (#933)

source/_components/binary_sensor.modbus.markdown

@@ -0,0 +1,37 @@
+---
+layout: page
+title: "Modbus Binary Sensor"
+description: "Instructions on how to set up Modbus binary sensors within Home Assistant."
+date: 2016-09-13 12:02
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: modbus.png
+ha_category: Binary Sensor
+ha_release: 0.28
+---
+
+The `modbus` binary sensor allows you to gather data from [Modbus](http://www.modbus.org/) coils.
+
+To use your Modbus binary sensors in your installation, add the following to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yml entry
+binary_sensor:
+  platform: modbus
+  coils:
+    - name: Sensor1
+      slave: 1
+      coil: 100
+    - name: Sensor2
+      slave: 1
+      coil: 110
+```
+
+Configuration variables:
+
+- **coils** array (*Required*): The array contains a list of coils to read from.
+  - **name** (*Required*): Name of the sensor.
+  - **slave** (*Required*): The number of the slave (Optional for tcp and upd Modbus).
+  - **coil** (*Required*): Coil number.