// ntddser.h

// CTL_CODE(0x001b, 0x001, METHOD_BUFFERED, FILE_ANY_ACCESS)
#define IOCTL_SERIAL_SET_BAUD_RATE 0x001B0004
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Windows Driver Kit DDI reference (ni-ntddser-ioctl_serial_set_baud_rate)

IOCTL_SERIAL_SET_BAUD_RATE IOCTL

Description

The IOCTL_SERIAL_SET_BAUD_RATE request sets the baud rate on a serial controller device. The serial controller driver verifies the specified baud rate.

To obtain the baud rate, a client can use an IOCTL_SERIAL_GET_BAUD_RATE request.

Parameters

Major code

Input buffer

The AssociatedIrp.SystemBuffer member points to a SERIAL_BAUD_RATE structure that a client allocates and sets to input the baud rate.

Input buffer length

The Parameters.DeviceIoControl.InputBufferLength member is set to the size, in bytes, of a SERIAL_BAUD_RATE structure.

Output buffer

None.

Output buffer length

None.

Input/output buffer

Input/output buffer length

Status block

The Information member is set to zero.

The Status member is set to one of the Generic Status Values for Serial Device Control Requests.

IOCTL_SERIAL_SET_BAUD_RATE - NtDoc