Note
Access to this page requires authorization. You can try signing in or changing directories.
Access to this page requires authorization. You can try changing directories.
The following table shows the serial port driver IOCTLs.
| Programming element | Description |
|---|---|
| IOCTL_SERIAL_CLR_DTR | This IOCTL sets the Data Terminal Ready (DTR) signal to low. It is used by the COM_IOControl function. |
| IOCTL_SERIAL_CLR_RTS | This IOCTL sets the Request to Send (RTS) signal to low. It is used by the COM_IOControl function. |
| IOCTL_SERIAL_DISABLE_IR | This IOCTL sets the device-control block on a specified communications device to disable the infrared port. |
| IOCTL_SERIAL_ENABLE_IR | This IOCTL sets the device-control block on a specified communications device to enable the infrared port. |
| IOCTL_SERIAL_GET_COMMSTATUS | This IOCTL clears pending communications errors and returns the current communication status. |
| IOCTL_SERIAL_GET_DCB | This IOCTL gets the device-control block from a specified communications device. |
| IOCTL_SERIAL_GET_MODEMSTATUS | This IOCTL gets the current modem control-register values. |
| IOCTL_SERIAL_GET_PROPERTIES | This IOCTL gets information about the communications properties for a device. |
| IOCTL_SERIAL_GET_TIMEOUTS | This IOCTL gets the time-out parameters for all read/write operations on a specified communications device. |
| IOCTL_SERIAL_GET_WAIT_MASK | This IOCTL retrieves the value of the wait mask. |
| IOCTL_SERIAL_IMMEDIATE_CHAR | This IOCTL transmits a specified character ahead of any pending data in the output buffer of a communications device. |
| IOCTL_SERIAL_PURGE | This IOCTL discards characters from the output or input buffer of a specified communications resource. |
| IOCTL_SERIAL_SET_BREAK_OFF | This IOCTL clears the break state. |
| IOCTL_SERIAL_SET_BREAK_ON | This IOCTL sets the break state. |
| IOCTL_SERIAL_SET_DCB | This IOCTL sets the device-control block on a specified communications device. |
| IOCTL_SERIAL_SET_DTR | This IOCTL sets the Data Terminal Ready (DTR) signal to high. |
| IOCTL_SERIAL_SET_QUEUE_SIZE | This IOCTL sets the input and output queue sizes of a communications device. |
| IOCTL_SERIAL_SET_RTS | This IOCTL sets the Request to Send (RTS) signal to high. |
| IOCTL_SERIAL_SET_TIMEOUTS | This IOCTL sets the time-out parameters for all read/write operations on a specified communications device. |
| IOCTL_SERIAL_SET_WAIT_MASK | This IOCTL sets the value of the wait mask. |
| IOCTL_SERIAL_SET_XOFF | This IOCTL causes transmission to act as if an XOFF character has been received. |
| IOCTL_SERIAL_SET_XON | This IOCTL causes transmission to act as if an XON character has been received. |
| IOCTL_SERIAL_WAIT_ON_MASK | This IOCTL instructs a serial driver to wait for a communications event that matches the event specified in the event mask. |
Send Feedback on this topic to the authors