Write to display(s) in a certain zone,sub-zone. The update of the display is immediate. 

 | Byte | Description                                                               | 
 | :----: | -----------                                                               | 
 | 0    | index - Increase by one for each event sent for specific text to display. | 
 | 1    | Zone for which event applies to (0-255). 255 is all zones.                | 
 | 2    | Sub-zone for which event applies to (0-255). 255 is all sub-zones.        | 
 | 3-7  | Display data.                                                             | 

Index is increased by one for each event that builds up a specific event. If needed an empty (no data) can be sent as the last event else sending data to fill the display buffer will give the end automatically. 
