| Symbol | Value | Description |
|---|---|---|
DEVICETYPE_UNKNOWN | 0x00000000 | The type of the device is unknown. |
DEVICETYPE_PORT | 0x00000001 | The device is a standard serial communication port. |
DEVICETYPE_MODEM | 0x00000002 | The device is a standard modem. |
DEVICETYPE_BOTH | 0x00000003 | The device behaves as a communication port and as a modem. |