Explanation of channel status info.

Readme.md

@@ -906,3 +906,69 @@ curl  -H "Content-Type: application/json" -X POST -d '{"aggregationType":"extrem
 ]
 ```
 
+<a name="query_channel_status"/>
+
+## Query Channel Status 
+
+It is possible to retieve channel specific status information.
+
+### Request
+
+```
+POST http://<host>:<port>/status/channels
+```
+
+#### Data
+
+```json
+{
+	"channels":[
+		"Channel_02",
+		"Channel_04"
+	]
+}
+```
+
+##### Explanation
+
+- **channels**: Array of channels to be queried (see [here](Readme.md#query_channel_names) and [here](Readme.md#define_channel_names)).
+
+### Example
+
+#### Command
+
+```bash
+curl -H "Content-Type: application/json" -X POST -d '{"channels": ["Channel_02","Channel_04"]}' http://data-api.psi.ch/sf/status/channels | python -m json.tool
+```
+
+#### Response
+
+```json
+[
+   {
+      "channel":{
+         "name":"Channel_02",
+         "backend":"sf-databuffer"
+      },
+      "recording":true,
+      "connected":true,
+      "lastEventDate":"2016-07-06T09:16:19.607242575+02:00"
+   },
+   {
+      "channel":{
+         "name":"Channel_04",
+         "backend":"sf-archiverappliance"
+      },
+      "recording":false,
+      "connected":false,
+      "lastEventDate":"2016-07-06T04:16:14.000000000+02:00"
+   }
+]
+```
+
+##### Explanation
+
+- **channel**: The name and backend of the channel.
+- **recording**: Defines if the channel is still recorded (please note that for beam synchronous DAQ this means that the source/IOC providing the channel is still recorded).
+- **connected**: Defines if the channel is still connected (please note that for beam synchronous DAQ this means that the source/IOC providing the channel is still connected).
+- **lastEventDate**: The timestamp of the last received event from the channel in the ISO8601 format.