These are possible device states. 
| Enumerator | 
|---|
| IDS_Unavailable | Device is not available.  | 
| IDS_Ready | Device is ready for reading.  | 
| IDS_Disconnected | Device is disconnected.  | 
| IDS_Waiting | Device is waiting for initialisation.  | 
| IDS_Max | Maximum device state.  | 
| IDS_ForceInt | Force device state to an int type.  |