IOCTL_SERIAL_GET_DTRRTS control code

The IOCTL_SERIAL_GET_DTRRTS request returns information about the data terminal ready (DTR) control signal and the request to send (RTS) control signal.

Input Parameters

The Parameters.DeviceIoControl.OutputBufferLength member is set to the size in bytes of a ULONG.

Output Parameters

The AssociatedIrp.SystemBuffer member points to a client-allocated ULONG buffer that Serial.sys uses to output information about the DTR and RTS. The ULONG buffer is set to zero or to the bitwise-OR of one or more of the following flag bits:

SERIAL_DTR_STATE

Indicates that DTR is set.

SERIAL_RTS_STATE

Indicates that RTS is set.

I/O Status Block

If the request is successful, the Information member is set to the size in bytes of a ULONG. Otherwise, the Information member is set to zero.

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

Requirements

Header

Ntddser.h (include Ntddser.h)

See also

IOCTL_SERIAL_SET_DTR
IOCTL_SERIAL_SET_RTS

 

 

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