This is the response from a read or a write. Note that the data is returned in both cases and can be checked for validity. 

There may be nodes that can not send a full level II frame and therefore will reply with more than one of this
event to fullfil the request.

 | Byte      | Description                               | 
 | ----      | -----------                               | 
 | Byte 0-3  | Start register for register read/written. | 
 | Byte 4…   | Data read/written.                        | 
 
 Data read/written can be a maximum of 512-4 = 508 bytes for read and 512-16-4 = 492 bytes for a write response.
