IOCTL_SERIAL_CLR_DTR control code

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.

Input Parameters

None.

Output Parameters

None.

I/O 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.

Requirements

Header

Ntddser.h (include Ntddser.h)

See also

IOCTL_SERIAL_SET_DTR

 

 

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