Add docs for LCN binary_sensor platform

source/_components/lcn.markdown

@@ -28,6 +28,7 @@ With this setup sending and receiving commands to and from LCN modules is possib
 
 There is currently support for the following device types within Home Assistant:
 
+- [Binary Sensor](#binary_sensor)
 - [Cover](#cover)
 - [Light](#light)
 - [Switch](#switch)
@@ -47,6 +48,11 @@ lcn:
       username: lcn
       password: lcn
 
+  binary_sensors:
+    - name: Kitchen window
+      address: myhome.s0.m7
+      source: binsensor1
+
   covers:
     - name: Living room cover
       address: myhome.s0.m7
@@ -103,6 +109,24 @@ connections:
       default: steps50
       type: string
 
+binary_sensors:
+  description: List of your binary sensors.
+  required: false
+  type: map
+  keys:
+    name:
+      description: "Name of the sensor."
+      required: true
+      type: string
+    address:
+      description: "[Address](/components/lcn#lcn-addresses) of the module/group."
+      required: true
+      type: string
+    source:
+      description: "Sensor source ([BINSENSOR](/components/lcn#ports), [SETPOINT](/components/lcn#variables-and-units), [KEYS](/components/lcn#keys))."
+      required: true
+      type: string
+
 covers:
   description: List of your covers.
   required: false
@@ -211,6 +235,7 @@ The platforms and service calls use several predefined constants as parameters.
 | OUTPUT_PORT | `output1`, `output2`, `output3`, `output4` |
 | RELAY_PORT | `relay1`, `relay2`, `relay3`, `relay4`, `relay5`, `relay6`, `relay7`, `relay8` |
 | MOTOR_PORT | `motor1`, `motor2`, `motor3`, `motor4` |
+| BINSENSOR_PORT | `binsensor1`, `binsensor2`, `binsensor3`, `binsensor4`, `binsensor5`, `binsensor6`, `binsensor7`, `binsensor8` |
 
 The [MOTOR_PORT](/components/lcn#ports) values specify which hardware relay configuration will be used:
 
@@ -221,18 +246,41 @@ The [MOTOR_PORT](/components/lcn#ports) values specify which hardware relay conf
 | `motor3` | `relay5`     | `relay6`      |
 | `motor4` | `relay7`     | `relay8`      |
 
-## {% linkable_title Cover %}
+### {% linkable_title Variables and Units %}
+
+| Constant | Values |
+| -------- | ------ |
+| SETPOINT | `r1varsetpoint`, `r2varsetpoint` |
+
+### {% linkable_title Keys %}:
+
+Whenever a key has to be provided, it is defined by a joint string consisting of the table identifier (`a`, `b`, `c`, `d`) and the corresponding key number.
+Examples: `a1`, `a5`, `d8`.
+
+## {% linkable_title Platforms %}
+
+### {% linkable_title Binary Sensor %}
+
+The `lcn` binary sensor platform allows the monitoring of the following [LCN](http://www.lcn.eu) binary data sources:
+
+- Binary hardware sensors
+- Lock state of regulator setpoints
+- Lock state of keys
+
+The binary sensor can be used in automation scripts or in conjunction with `template` platforms.
+
+### {% linkable_title Cover %}
 
 The `lcn` cover platform allows the control of [LCN](http://www.lcn.eu) relays which have been configured as motor controllers.
 
-## {% linkable_title Light %}
+### {% linkable_title Light %}
 
 The `lcn` light platform allows the control of the following [LCN](http://www.lcn.eu) ports:
 
 - (Dimmable) output ports
 - Relays
 
-## {% linkable_title Switch %}
+### {% linkable_title Switch %}
 
 The `lcn` switch platform allows the control of the following [LCN](http://www.lcn.eu) ports: