Serial Port Driver IOCTLs

Other versions of this page are also available for the following:

• Windows Embedded CE 6.0 R3

8/28/2008

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.