This enumeration determines the device event.
| IG_TW_DE_CHECKAUTOMATICCAPTURE | The automatic capture settings on the device have been changed by the user. |
| IG_TW_DE_CHECKBATTERY | The status of the battery has changed. |
| IG_TW_DE_CHECKDEVICEONLINE | The device has been turned off and on. |
| IG_TW_DE_CHECKFLASH | The flash setting on the device has been changed by the user. |
| IG_TW_DE_CHECKPOWERSUPPLY | The power supply has been changed. |
| IG_TW_DE_CHECKRESOLUTION | The x/y resolution setting on the device has been changed by the user. |
| IG_TW_DE_CUSTOMEVENTS | Baseline for events specific to a given Source. |
| IG_TW_DE_DEVICEADDED | The user has added a device (for instance a memory card in a digital camera). |
| IG_TW_DE_DEVICEOFFLINE | A device has become unavailable, but has not been removed. |
| IG_TW_DE_DEVICEREADY | The device is ready to capture an image. |
| IG_TW_DE_DEVICEREMOVED | The user has removed a device. |
| IG_TW_DE_IMAGECAPTURED | The user has captured an image to the device's internal storage. |
| IG_TW_DE_IMAGEDELETED | The user has removed an image from the device's internal storage. |
| IG_TW_DE_LAMPFAILURE | The device's light source has failed. |
| IG_TW_DE_PAPERDOUBLEFEED | Two or more sheets of paper have been fed together. |
| IG_TW_DE_PAPERJAM | The device's document feeder has jammed. |
| IG_TW_DE_POWERSAVE | The device has powered down to save energy. |
| IG_TW_DE_POWERSAVENOTIFY | The device is about to power down to save energy. |