ID Check. A user or a device has gone through an identification test and is either allowed or not allowed access according to bits in byte 0.

 | Data byte | Description |
 | :---------: | ----------- |
 | 0 | ID check bits. |
 | 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. |

 **ID Check bits**
 
 | Bit | Description |
 | :---------: | ----------- |
 | 0 | Authenticated if set to one. |
 | 1 | Authorized if set to one. |
