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StopBits Enumeration

Specifies the number of stop bits used on the SerialPort object.

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

public enum StopBits

Member nameDescription
NoneNo stop bits are used. This value is not supported by the StopBits property.
OneOne stop bit is used.
TwoTwo stop bits are used.
OnePointFive1.5 stop bits are used.

You use this enumeration when setting the value of the StopBits property on the SerialPort class. Stop bits separate each unit of data on an asynchronous serial connection. They are also sent continuously when no data is available for transmission.

The SerialPort class throws an ArgumentOutOfRangeException exception when you set the StopBits property to None.

The following example shows how to set the StopBits property to One.


SerialPort mySerialPort = new SerialPort("COM1");

mySerialPort.BaudRate = 9600;
mySerialPort.Parity = Parity.None;
mySerialPort.StopBits = StopBits.One;
mySerialPort.DataBits = 8;
mySerialPort.Handshake = Handshake.None;


The following code example displays the possible values of the StopBits enumeration to the console, then prompts the user to choose one. This code example is part of a larger code example provided for the SerialPort class.


public static StopBits SetPortStopBits(StopBits defaultPortStopBits)
{
    string stopBits;

    Console.WriteLine("Available Stop Bits options:");
    foreach (string s in Enum.GetNames(typeof(StopBits)))
    {
        Console.WriteLine("   {0}", s);
    }

    Console.Write("Stop Bits({0}):", defaultPortStopBits.ToString());
    stopBits = Console.ReadLine();

    if (stopBits == "")
    {
        stopBits = defaultPortStopBits.ToString();
    }

    return (StopBits)Enum.Parse(typeof(StopBits), stopBits);
}


.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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