Perform open on all nodes in zone. 

 | Data byte | Description                                                         | 
 | :---------: | -----------                                                         | 
 | 0         | Optional byte that have a meaning given by the issuer of the event. | 
 | 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.  | 

