IOCTL_SERIAL_CLR_DTR - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers 
// ntddser.h

// CTL_CODE(0x001b, 0x00a, METHOD_BUFFERED, FILE_ANY_ACCESS)
#define IOCTL_SERIAL_CLR_DTR 0x001B0028
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Windows Driver Kit DDI reference (ni-ntddser-ioctl_serial_clr_dtr)

IOCTL_SERIAL_CLR_DTR IOCTL

Description

The IOCTL_SERIAL_CLR_DTR request clears the data terminal ready (DTR) control signal.

To set DTR, a client can use an IOCTL_SERIAL_SET_DTR request.

If the handshake flow control of the device is configured to automatically use DTR, a client cannot clear or set DTR.

Parameters

Major code

Input buffer

None.

Input buffer length

None.

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. A status of STATUS_INVALID_PARAMETER indicates that the handshake flow control of the device is set to automatically use DTR.

See also

IOCTL_SERIAL_SET_DTR

View the official Windows Driver Kit DDI reference

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