Gets the state of the Data Set Ready (DSR) signal.
(in System.dll)
'Usage
Dim instance As SerialPort
Dim value As Boolean
value = instance.DsrHolding
'Declaration
<BrowsableAttribute(False)> _
Public ReadOnly Property DsrHolding As Boolean
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.
Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
.NET Framework
Supported in: 3.5, 3.0, 2.0
.NET Compact Framework
Supported in: 3.5, 2.0
Reference
