Gets or sets the size of the System.IO.Ports.SerialPort input buffer.
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The SerialPort.ReadBufferSize property ignores any value smaller than 4096.
Because the SerialPort.ReadBufferSize property represents only the Windows-created buffer, it can return a smaller value than the SerialPort.BytesToRead property, which represents both the System.IO.Ports.SerialPort buffer and the Windows-created buffer.