DsrHolding Property

SerialPort.DsrHolding Property

 

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

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

[<BrowsableAttribute(false)>]
member DsrHolding : bool with 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
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