Windows apps
Collapse the table of content
Expand the table of content
Information
The topic you requested is included in another documentation set. For convenience, it's displayed below. Choose Switch to see the topic in its original location.

SerialPort::DsrHolding Property

 

Gets the state of the Data Set Ready (DSR) signal.

Namespace:   System.IO.Ports
Assembly:  System (in System.dll)

public:
[BrowsableAttribute(false)]
property bool DsrHolding {
	bool get();
}

Property Value

Type: System::Boolean

true if a Data Set Ready signal has been sent to the port; otherwise, false.

Exception Condition
IOException

The port is in an invalid state.

- or -

An attempt to set the state of the underlying port failed. For example, the parameters passed from this SerialPort object were invalid.

InvalidOperationException

The stream is closed. This can occur because the Open method has not been called or the Close method has been called.

This property is used in Data Set Ready/Data Terminal Ready (DSR/DTR) handshaking. The Data Set Ready (DSR) signal is usually sent by a modem to a port to indicate that it is ready for data transmission or data reception.

.NET Framework
Available since 2.0
Return to top
Show:
© 2017 Microsoft