SerialPort.BaudRate Propriedade

Definição

Obtém ou define a taxa de transmissão serial.Gets or sets the serial baud rate.

public:
 property int BaudRate { int get(); void set(int value); };
public int BaudRate { get; set; }
[System.ComponentModel.Browsable(true)]
public int BaudRate { get; set; }
member this.BaudRate : int with get, set
[<System.ComponentModel.Browsable(true)>]
member this.BaudRate : int with get, set
Public Property BaudRate As Integer

Valor da propriedade

Int32

A taxa de transmissão.The baud rate.

Atributos

Exceções

A taxa de transmissão especificada é menor ou igual a zero, ou é maior que a taxa de transmissão máxima permitida para o dispositivo.The baud rate specified is less than or equal to zero, or is greater than the maximum allowable baud rate for the device.

A porta está em um estado inválido.The port is in an invalid state.

- ou --or- Falha ao tentar definir o estado da porta subjacente.An attempt to set the state of the underlying port failed. Por exemplo, os parâmetros passados deste objeto SerialPort eram inválidos.For example, the parameters passed from this SerialPort object were invalid.

Exemplos

O exemplo a seguir mostra como definir a BaudRate propriedade como 9600 .The following example shows how to set the BaudRate property to 9600.

SerialPort^ mySerialPort = gcnew SerialPort("COM1");

mySerialPort->BaudRate = 9600;
mySerialPort->Parity = Parity::None;
mySerialPort->StopBits = StopBits::One;
mySerialPort->DataBits = 8;
mySerialPort->Handshake = Handshake::None;
mySerialPort->RtsEnable = true;
SerialPort mySerialPort = new SerialPort("COM1");

mySerialPort.BaudRate = 9600;
mySerialPort.Parity = Parity.None;
mySerialPort.StopBits = StopBits.One;
mySerialPort.DataBits = 8;
mySerialPort.Handshake = Handshake.None;
mySerialPort.RtsEnable = true;
Dim mySerialPort As New SerialPort("COM1")

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

O exemplo a seguir demonstra o uso da SerialPort classe para permitir que dois usuários conversem de dois computadores separados conectados por um cabo de modem nulo.The following example demonstrates the use of the SerialPort class to allow two users to chat from two separate computers connected by a null modem cable. Neste exemplo, os usuários são solicitados a fornecer as configurações de porta e um nome de usuário antes de bater papo.In this example, the users are prompted for the port settings and a username before chatting. Este exemplo de código é parte de um exemplo de código maior fornecido para a SerialPort classe.This code example is part of a larger code example provided for the SerialPort class.

public:
    static void Main()
    {
        String^ name;
        String^ message;
        StringComparer^ stringComparer = StringComparer::OrdinalIgnoreCase;
        Thread^ readThread = gcnew Thread(gcnew ThreadStart(PortChat::Read));

        // Create a new SerialPort object with default settings.
        _serialPort = gcnew SerialPort();

        // Allow the user to set the appropriate properties.
        _serialPort->PortName = SetPortName(_serialPort->PortName);
        _serialPort->BaudRate = SetPortBaudRate(_serialPort->BaudRate);
        _serialPort->Parity = SetPortParity(_serialPort->Parity);
        _serialPort->DataBits = SetPortDataBits(_serialPort->DataBits);
        _serialPort->StopBits = SetPortStopBits(_serialPort->StopBits);
        _serialPort->Handshake = SetPortHandshake(_serialPort->Handshake);

        // Set the read/write timeouts
        _serialPort->ReadTimeout = 500;
        _serialPort->WriteTimeout = 500;

        _serialPort->Open();
        _continue = true;
        readThread->Start();

        Console::Write("Name: ");
        name = Console::ReadLine();

        Console::WriteLine("Type QUIT to exit");

        while (_continue)
        {
            message = Console::ReadLine();

            if (stringComparer->Equals("quit", message))
            {
                _continue = false;
            }
            else
            {
                _serialPort->WriteLine(
                    String::Format("<{0}>: {1}", name, message) );
            }
        }

        readThread->Join();
        _serialPort->Close();
    }

    static void Read()
    {
        while (_continue)
        {
            try
            {
                String^ message = _serialPort->ReadLine();
                Console::WriteLine(message);
            }
            catch (TimeoutException ^) { }
        }
    }
public static void Main()
{
    string name;
    string message;
    StringComparer stringComparer = StringComparer.OrdinalIgnoreCase;
    Thread readThread = new Thread(Read);

    // Create a new SerialPort object with default settings.
    _serialPort = new SerialPort();

    // Allow the user to set the appropriate properties.
    _serialPort.PortName = SetPortName(_serialPort.PortName);
    _serialPort.BaudRate = SetPortBaudRate(_serialPort.BaudRate);
    _serialPort.Parity = SetPortParity(_serialPort.Parity);
    _serialPort.DataBits = SetPortDataBits(_serialPort.DataBits);
    _serialPort.StopBits = SetPortStopBits(_serialPort.StopBits);
    _serialPort.Handshake = SetPortHandshake(_serialPort.Handshake);

    // Set the read/write timeouts
    _serialPort.ReadTimeout = 500;
    _serialPort.WriteTimeout = 500;

    _serialPort.Open();
    _continue = true;
    readThread.Start();

    Console.Write("Name: ");
    name = Console.ReadLine();

    Console.WriteLine("Type QUIT to exit");

    while (_continue)
    {
        message = Console.ReadLine();

        if (stringComparer.Equals("quit", message))
        {
            _continue = false;
        }
        else
        {
            _serialPort.WriteLine(
                String.Format("<{0}>: {1}", name, message));
        }
    }

    readThread.Join();
    _serialPort.Close();
}

public static void Read()
{
    while (_continue)
    {
        try
        {
            string message = _serialPort.ReadLine();
            Console.WriteLine(message);
        }
        catch (TimeoutException) { }
    }
}
Public Shared Sub Main()
    Dim name As String
    Dim message As String
    Dim stringComparer__1 As StringComparer = StringComparer.OrdinalIgnoreCase
    Dim readThread As New Thread(AddressOf Read)

    ' Create a new SerialPort object with default settings.
    _serialPort = New SerialPort()

    ' Allow the user to set the appropriate properties.
    _serialPort.PortName = SetPortName(_serialPort.PortName)
    _serialPort.BaudRate = SetPortBaudRate(_serialPort.BaudRate)
    _serialPort.Parity = SetPortParity(_serialPort.Parity)
    _serialPort.DataBits = SetPortDataBits(_serialPort.DataBits)
    _serialPort.StopBits = SetPortStopBits(_serialPort.StopBits)
    _serialPort.Handshake = SetPortHandshake(_serialPort.Handshake)

    ' Set the read/write timeouts
    _serialPort.ReadTimeout = 500
    _serialPort.WriteTimeout = 500

    _serialPort.Open()
    _continue = True
    readThread.Start()

    Console.Write("Name: ")
    name = Console.ReadLine()

    Console.WriteLine("Type QUIT to exit")

    While _continue
        message = Console.ReadLine()

        If stringComparer__1.Equals("quit", message) Then
            _continue = False
        Else
            _serialPort.WriteLine([String].Format("<{0}>: {1}", name, message))
        End If
    End While

    readThread.Join()
    _serialPort.Close()
End Sub

Public Shared Sub Read()
    While _continue
        Try
            Dim message As String = _serialPort.ReadLine()
            Console.WriteLine(message)
        Catch generatedExceptionName As TimeoutException
        End Try
    End While
End Sub

Comentários

A taxa de transmissão deve ser suportada pelo driver serial do usuário.The baud rate must be supported by the user's serial driver. O valor padrão é 9600 bits por segundo (bps).The default value is 9600 bits per second (bps).

Aplica-se a