Pencom (home-assistant#7879)

* Added Pencom relay component.

* Added Pencom relays.

* Fixed spelling, typos, and version number.

source/_components/switch.pencom.markdown

@@ -0,0 +1,69 @@
+---
+layout: page
+title: "Pencom"
+description: "How to use Pencom Designs 8 channel relay boards."
+date: 2018-10-05 23:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: pencom.png
+ha_category: Switch 
+ha_release: 0.85
+ha_iot_class: "Local Polling"
+---
+
+[Pencom Design](http://www.pencomdesign.com/) is a manufacturer of computer controlled relay, I/O and custom boards for commercial and industrial applications.  This interface to [Pencom's Relay Control Boards](https://www.pencomdesign.com/relay-boards/) is designed to work over an ethernet to serial adapter (NPort).  Each switch (relay) can be turned on/off, and the state of the relay can be read.
+
+## {% linkable_title Configuration %}
+
+The Pencom relays can be daisychained to allow for up to 8 boards.
+
+``` yaml
+# Example configuration.yaml entry
+switch:
+  - platform: pencom
+    host: host.domain.com
+    port: 4001
+    boards: 2 
+    relays:
+      - name: "Irrigation"
+        addr: 0 
+      - name: "Upper Entry Door"
+        addr: 1
+      - name: "Fountain"
+        addr: 0
+        board: 2
+```
+
+{% configuration %}
+host:
+  description: The IP address of the ethernet to serial adapter.  It is assumed that the adapter has been preconfigured.
+  required: true
+  type: string
+port:
+  description: The port of the ethernet to serial adapter.
+  required: true
+  type: port (positive integer between 1-65535)
+boards:
+  description: Number of boards daisychained together (default is 1).
+  required: false
+  type: int between 1 and 8
+relays:
+  description: List of relays. 
+  required: true
+  type: list 
+  keys:
+    name:
+      description: The name of the switch (component).
+      required: true
+      type: string
+    addr:
+      description: The relay on the board starting with 0.
+      required: true
+      type: int
+    board:
+      description: The board number (defaults to 1).
+      required: false
+      type: int between 1 and 8
+{% endconfiguration %}