最大数量可以写在com端口上的字节

Question

我已经使用RXTX comm编写了一个串行通信代码。当我在端口上写入13000字节时，没有写入任何内容但是当我写入115200或更少的字节时，它就像一个魅力。更多的事情只发生在一些系统上。

更新： 下面是我在端口上写字节的代码：

public String portWriter(byte[] messageString) throws NoSuchPortException {
        if (Processing.serialPort == null) {
        System.out.println("serial port is null");
        Processing.portId = CommPortIdentifier.getPortIdentifier(Processing.portText);
  try {
        Processing.serialPort = (SerialPort)   Processing.portId.open("SimpleWriteApp", 2000);
        } catch (PortInUseException e) {
            return "Port in use by another application.";
        }
        try {
            Processing.serialPort.setSerialPortParams(Processing.speed,
                    SerialPort.DATABITS_8,
                    SerialPort.STOPBITS_1,
                    SerialPort.PARITY_NONE);

        } catch (UnsupportedCommOperationException e) {
            return "Unsupported comm operation.";
        }
    }
    try {
        outputStream = Processing.serialPort.getOutputStream();
        outputStream.flush();
    } catch (IOException e) {
        return "Unable to write on port.";
    }


    try {
        //System.out.println("write " + new BigInteger(1, messageString).toString(16));
        outputStream.write(messageString);
    } catch (IOException e) {
        return "Unable to write on port.";
    }

    return null;
}